subject:(Cold wall boundary layer)

University of Illinois – Urbana-Champaign

1. Mejia Alvarez, Ricardo. Experimental study of low-order models of highly-irregular roughness and their impact on turbulent boundary layers.

Degree: PhD, 0242, 2011, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/18265

► The present effort explores the relative impact of various topographical scales present within irregular surface roughness on a turbulent boundary layer under both developing- and… (more)

▼ The present effort explores the relative impact of various topographical scales present within irregular surface roughness on a turbulent boundary layer under both developing- and developed-flow conditions. Low-order representations of highly irregular surface roughness replicated from a turbine-blade damaged by deposition of foreign materials were generated using singular value decomposition to decompose the complex topography into a set of topographical basis functions of decreasing importance to the original “full” surface character. The low-order surface models were then formed by truncating the full set of basis functions at the first 5 and 16 modes (containing approximately 71% and 95% of the full surface content, respectively) so that only the most dominant and large-scale topographical features were included in the models, while the finer-scale surface details are excluded. Physical replications of the full surface and the two low-order models were created using rapid prototyping methods to generate short and long streamwise fetches of roughness, and 2-D particle-image velocimetry (PIV) was used to acquire ensembles of instantaneous velocity fields in the streamwise–wall-normal plane for developing- and developed-flow conditions at moderate Reynolds number followed by stereo PIV measurements in a wall-parallel plane deep in the roughness sublayer (y = 0.047δ). Comparison of both single- and multipoint statistics (mean velocity and Reynolds normal and shear stresses) as well as quadrant analysis of the instantaneous events contributing to the mean Reynolds shear stress from the 2-D PIV measurements indicates that a 16-mode model of the full surface faithfully reproduces the characteristics of flow over the full surface for both developing- and developed-flow conditions. For the latter scenario, both the 5- and 16-mode models reproduce the outer-layer characteristics for flow over the full surface in accordance with Townsend’s wall similarity hypothesis. However, neither low-order surface representation fully reproduces important details of the Reynolds-shear-stress-producing events within the roughness sublayer, particularly the contributions of the most intense ejection and sweep events. The stereo-PIV measurements deep within the roughness sublayer at y = 0.047δ reveal a wealth of information about roughness-induced effects, including the tendency of the roughness to promote ‘channeling’ of the flow in the form of low- and high-momentum pathways as noted in contour maps of the mean velocity defect. Similarly, enhanced turbulent and vortical activity is observed both between and along the spanwise boundaries of these streamwise-elongated large-scale pathways. Taken together, these observations support the idea that these persistent low-momentum pathways might represent the statistical imprint of trains of hairpin vortex packets that are channeled along preferred paths over the roughness. Conditional averaging and two-point correlations of velocity further support these structural observations, particularly… Advisors/Committee Members: Christensen, Kenneth T. (advisor), Christensen, Kenneth T. (Committee Chair), Best, James L. (committee member), Kyritsis, Dimitrios C. (committee member), Gioia, Gustavo (committee member).

Subjects/Keywords: Turbulence; Boundary Layer; Rough-wall flow

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APA (6^th Edition):

Mejia Alvarez, R. (2011). Experimental study of low-order models of highly-irregular roughness and their impact on turbulent boundary layers. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/18265

Chicago Manual of Style (16^th Edition):

Mejia Alvarez, Ricardo. “Experimental study of low-order models of highly-irregular roughness and their impact on turbulent boundary layers.” 2011. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed December 08, 2019. http://hdl.handle.net/2142/18265.

MLA Handbook (7^th Edition):

Mejia Alvarez, Ricardo. “Experimental study of low-order models of highly-irregular roughness and their impact on turbulent boundary layers.” 2011. Web. 08 Dec 2019.

Vancouver:

Mejia Alvarez R. Experimental study of low-order models of highly-irregular roughness and their impact on turbulent boundary layers. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2011. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/2142/18265.

Council of Science Editors:

Mejia Alvarez R. Experimental study of low-order models of highly-irregular roughness and their impact on turbulent boundary layers. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/18265

University of Toronto

2. Lane, Creighton. Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations.

Degree: 2018, University of Toronto

URL: http://hdl.handle.net/1807/89620

►

The turbulent boundary layer (TBL) noise generated inside an aircraft can have a detrimental impact on humans. In an effort to better understand TBL physics… (more)

Subjects/Keywords: Aeroacoustics; Turbulent boundary layer; Wall-pressure; 0538

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APA (6^th Edition):

Lane, C. (2018). Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/89620

Chicago Manual of Style (16^th Edition):

Lane, Creighton. “Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations.” 2018. Masters Thesis, University of Toronto. Accessed December 08, 2019. http://hdl.handle.net/1807/89620.

MLA Handbook (7^th Edition):

Lane, Creighton. “Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations.” 2018. Web. 08 Dec 2019.

Vancouver:

Lane C. Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations. [Internet] [Masters thesis]. University of Toronto; 2018. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/1807/89620.

Council of Science Editors:

Lane C. Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations. [Masters Thesis]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/89620

3. Joo, Jhiin. Large-eddy simulation of turbulent wall-pressure fluctuations using the finite element method.

Degree: 2019, University of Tennessee – Chattanooga

URL: https://scholar.utc.edu/theses/612

► In the present dissertation, turbulent wall-pressure fluctuations are characterized. To capture the turbulent characteristics of the flow, large-eddy simulation is used to resolve the large… (more)

▼ In the present dissertation, turbulent wall-pressure fluctuations are characterized. To capture the turbulent characteristics of the flow, large-eddy simulation is used to resolve the large scale motions of the flow directly. A wall-adapting local eddy-viscosity model is selected to account for the effect of small scale motions. The streamwise/upwind Petrov-Galerkin method is chosen to discretize the computational domain and a second-order backward difference formula is applied for the time integration. Maintaining turbulent flow throughout the simulation domain to properly characterize turbulence is critical in investigating wall-pressure fluctuations. In order to reduce the size of the simulation domain an inflow generation method, a variant of the recycling and rescaling method, is used. In this method, the turbulent velocity profile from a specific plane within the computational domain is recycled and rescaled propriately, and re-introduced at the inlet of the domain at every time step iteration. In the proposed method, the mean velocity profile is fixed at the inlet while the velocity fluctuations are recycled and rescaled to obtain the desired turbulent characteristics. This method is simple and effective and maintains the turbulent flow throughout the simulation domain. The non-reflecting boundary conditions with a sponge layer are applied at the top and exit of the computational domain to remove unwanted reflections from the boundary. In order to examine the present inflow generation method and the ability to capture the wall-pressure fluctuations, numerical results are verified on a flat plate with a zero pressure gradient. The mean velocity profile, the RMS velocity fluctuations, and the friction velocity over time are investigated to show the effectiveness of the present inflow turbulent generation method. Computed wall-pressure fluctuations are evaluated using the time-averaged statistics and the spectra, to show that they are characterized well using the present method. Advisors/Committee Members: Sreenivas, Kidambi, Newman, James C., III, Swafford, Timothy, Matthews, John V., III, College of Engineering and Computer Science.

Subjects/Keywords: Wall pressure (Aerodynamics); Turbulent boundary layer

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APA (6^th Edition):

Joo, J. (2019). Large-eddy simulation of turbulent wall-pressure fluctuations using the finite element method. (Doctoral Dissertation). University of Tennessee – Chattanooga. Retrieved from https://scholar.utc.edu/theses/612

Chicago Manual of Style (16^th Edition):

Joo, Jhiin. “Large-eddy simulation of turbulent wall-pressure fluctuations using the finite element method.” 2019. Doctoral Dissertation, University of Tennessee – Chattanooga. Accessed December 08, 2019. https://scholar.utc.edu/theses/612.

MLA Handbook (7^th Edition):

Joo, Jhiin. “Large-eddy simulation of turbulent wall-pressure fluctuations using the finite element method.” 2019. Web. 08 Dec 2019.

Vancouver:

Joo J. Large-eddy simulation of turbulent wall-pressure fluctuations using the finite element method. [Internet] [Doctoral dissertation]. University of Tennessee – Chattanooga; 2019. [cited 2019 Dec 08]. Available from: https://scholar.utc.edu/theses/612.

Council of Science Editors:

Joo J. Large-eddy simulation of turbulent wall-pressure fluctuations using the finite element method. [Doctoral Dissertation]. University of Tennessee – Chattanooga; 2019. Available from: https://scholar.utc.edu/theses/612

Oregon State University

4. Johnson, Christopher (Raymond Christopher). Bright air : geoprocessing thermal imagery to map the nocturnal dynamics of the boundary layer in a mountain valley.

Degree: MS, Ocean, Earth and Atmospheric Sciences, 2015, Oregon State University

URL: http://hdl.handle.net/1957/55592

► A thermal infrared (TIR) camera is used to remotely sense the foliage temperature in a mountain valley. The foliage temperature is used as a proxy… (more)

▼ A thermal infrared (TIR) camera is used to remotely sense the foliage temperature in a mountain valley. The foliage temperature is used as a proxy for air temperature and can be used to study and map the dynamics of the nocturnal, weak-wind boundary layer in this valley. All radiative flux not originating from the forest canopy must be filtered out of the captured imagery. Once the image has been filtered it must be georeferenced and orthorectified before useful analyses can be performed. After geoprocessing is complete, a spatially explicit time series of temperatures for an entire forested mountain valley will be available for further exploitation. The geoprocessed thermal imagery can, when combined with various data recorded in situ, yield data sets such as sensible heat flux at the canopy surface, potential temperature profiles, the adiabatic lapse rate in the watershed, the state of static stability in the watershed, and to map cold-air pool dynamics. Evidence was established that two concepts underlying the Bright Air study are valid for this study site. The first is that a TIR camera can accurately record foliage canopy temperature. The second is that on clear nights, foliage canopy temperature can be a proxy for the temperature of air immediately adjacent to the canopy. This study indicates that a TIR camera can accurately measure foliage canopy temperature on clear nights. Furthermore, the study indicates that on clear or intermittently cloudy nights, foliage canopy temperatures as measured by a TIR camera can be a proxy for the temperature of air immediately adjacent to the canopy. A process to georeference and orthorectify thermal imagery was selected and a tool to geoprocess the thermal imagery was created. Vertical profiles of potential temperature in the study area were created for times of interest and classified according to flow regimes. Dominant flow regimes were found to correlate well with earlier studies. Cold-air pool formation and drainage evolution were characterized for several clear nights. Nocturnal cold-air dynamics in the study area do not agree with common explanations of behavior of cold-air pools and drainage in mountain valleys. Up-valley flow patterns in the watershed indicate that nocturnal flows in mountain valleys are not driven solely by gravity. For the nights studied, flows in the watershed interact with flows from other connected basins and have identifiable patterns and typical evolutionary stages. Advisors/Committee Members: Thomas, Christoph (advisor), Nolin, Anne (committee member).

Subjects/Keywords: Cold Air Pooling; Boundary layer (Meteorology)

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APA (6^th Edition):

Johnson, C. (. C. (2015). Bright air : geoprocessing thermal imagery to map the nocturnal dynamics of the boundary layer in a mountain valley. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/55592

Chicago Manual of Style (16^th Edition):

Johnson, Christopher (Raymond Christopher). “Bright air : geoprocessing thermal imagery to map the nocturnal dynamics of the boundary layer in a mountain valley.” 2015. Masters Thesis, Oregon State University. Accessed December 08, 2019. http://hdl.handle.net/1957/55592.

MLA Handbook (7^th Edition):

Johnson, Christopher (Raymond Christopher). “Bright air : geoprocessing thermal imagery to map the nocturnal dynamics of the boundary layer in a mountain valley.” 2015. Web. 08 Dec 2019.

Vancouver:

Johnson C(C. Bright air : geoprocessing thermal imagery to map the nocturnal dynamics of the boundary layer in a mountain valley. [Internet] [Masters thesis]. Oregon State University; 2015. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/1957/55592.

Council of Science Editors:

Johnson C(C. Bright air : geoprocessing thermal imagery to map the nocturnal dynamics of the boundary layer in a mountain valley. [Masters Thesis]. Oregon State University; 2015. Available from: http://hdl.handle.net/1957/55592

Virginia Tech

5. Rasnick, Matthew Byron. The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements.

Degree: MS, Aerospace and Ocean Engineering, 2010, Virginia Tech

URL: http://hdl.handle.net/10919/33202

► This study focuses on measuring and normalizing the roughness noise of multiple roughness types across numerous layouts and flow speeds. Using the Virginia Tech Anechoic… (more)

Subjects/Keywords: roughness noise; wall jet; unsteady drag; rough wall turbulent boundary layer

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rasnick, M. B. (2010). The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33202

Chicago Manual of Style (16^th Edition):

Rasnick, Matthew Byron. “The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements.” 2010. Masters Thesis, Virginia Tech. Accessed December 08, 2019. http://hdl.handle.net/10919/33202.

MLA Handbook (7^th Edition):

Rasnick, Matthew Byron. “The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements.” 2010. Web. 08 Dec 2019.

Vancouver:

Rasnick MB. The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements. [Internet] [Masters thesis]. Virginia Tech; 2010. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10919/33202.

Council of Science Editors:

Rasnick MB. The Noise of a Boundary Layer Flowing Over Discrete Roughness Elements. [Masters Thesis]. Virginia Tech; 2010. Available from: http://hdl.handle.net/10919/33202

6. Ben Nasr, Ouissem. Numerical simulations of supersonic turbulent wall-bounded flows : Etude numérique des transferts pariétaux en écoulements turbulents supersoniques.

Degree: Docteur es, Mécanique des fluides, 2012, Rouen, INSA

URL: http://www.theses.fr/2012ISAM0008

►

Cette thèse traite des transferts pariétaux dans les écoulements turbulents supersoniques via la simulation des grandes échelles turbulentes. Des couches limites adiabatique et refroidie évoluant… (more)

▼

Cette thèse traite des transferts pariétaux dans les écoulements turbulents supersoniques via la simulation des grandes échelles turbulentes. Des couches limites adiabatique et refroidie évoluant à Mach M∞ = 2 et à Reynolds Re0 ≈ 2600 sont considérées. Les simulations numériques utilisent un schéma split-centered d’ordre élevé pour la discrétisation des flux convectifs. Les résultats obtenus sont comparés aux simulations numériques directes (DNS) disponibles dans la littérature. Plusieurs modèles de sous-maille ont été testés et validés. Il a été montré que ces modèles exigent un minimum de raffinement de maillage afin de capturer les structures les plus énergétiques présentes en proche paroi. Les modèles montrent des performances différentes pour la distribution de la température à la paroi. Pour le cas d’une paroi refroidie, les fluctuations de température totale ne sont pas négligeables dans la région proche-paroi. Et l’anticorrélation (u’, T’) se basant sur l’hypothèse de Morkovin n’est pas satisfaite.

This work deals with spatially-evolving supersonic turbulent boundary layers over adiabatic and cold walls at M∞ = 2 and up to Re0 ≈ 2600 using 3 different SGS models. The numerical methodology is based on high-order split-centered scheme to discretize the convective fluxes of the Navier-Stokes equations . For the adiabatic case, it is demonstrated that all SGS models require a comparable minimum grid-refinement in order to capture accurately the near-wall-turbulence. Overall, the models exhibit correct behavior when predictiong the dynamic properties, but show different performances for the temperature distribution in the near-wall region. For the isothermal case, it is found that the compressibility effects are not enhanced due to the wall cooling. As expected, the total temperature fluctuations are not negligible in the near-wall region. The study shows that the anti-correlation linking both velocity and temperature fields, derived from the Morkovin's hypothesis, is not satisfied.

Advisors/Committee Members: Hadjadj, Abdellah (thesis director).

Subjects/Keywords: Couche limite supersonique; Transferts pariétaux; Paroi refroidie; Analogie forte de Reynolds; Effets de compressibilité; Modélisation sous maille; Large-eddy simulation; Supersonic boundary layer; SGS modeling; Cold-wall boundary layer; Heat transfer; Strong Reynolds Analogy; Compressibility effects; 532

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ben Nasr, O. (2012). Numerical simulations of supersonic turbulent wall-bounded flows : Etude numérique des transferts pariétaux en écoulements turbulents supersoniques. (Doctoral Dissertation). Rouen, INSA. Retrieved from http://www.theses.fr/2012ISAM0008

Chicago Manual of Style (16^th Edition):

Ben Nasr, Ouissem. “Numerical simulations of supersonic turbulent wall-bounded flows : Etude numérique des transferts pariétaux en écoulements turbulents supersoniques.” 2012. Doctoral Dissertation, Rouen, INSA. Accessed December 08, 2019. http://www.theses.fr/2012ISAM0008.

MLA Handbook (7^th Edition):

Ben Nasr, Ouissem. “Numerical simulations of supersonic turbulent wall-bounded flows : Etude numérique des transferts pariétaux en écoulements turbulents supersoniques.” 2012. Web. 08 Dec 2019.

Vancouver:

Ben Nasr O. Numerical simulations of supersonic turbulent wall-bounded flows : Etude numérique des transferts pariétaux en écoulements turbulents supersoniques. [Internet] [Doctoral dissertation]. Rouen, INSA; 2012. [cited 2019 Dec 08]. Available from: http://www.theses.fr/2012ISAM0008.

Council of Science Editors:

Ben Nasr O. Numerical simulations of supersonic turbulent wall-bounded flows : Etude numérique des transferts pariétaux en écoulements turbulents supersoniques. [Doctoral Dissertation]. Rouen, INSA; 2012. Available from: http://www.theses.fr/2012ISAM0008

University of Manchester

7. Wang, Xinguang. Advanced RANS and Near-Wall Turbulence Modelling for High-Speed Flow.

Degree: 2019, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318489

► This research focuses on the development of wall functions suitable for the prediction of high-speed compressible flows. Wall-functions avoid the need for prohibitively expensive fine… (more)

▼ This research focuses on the development of wall functions suitable for the prediction of high-speed compressible flows. Wall-functions avoid the need for prohibitively expensive fine near-wall meshes and low-Re models of turbulence which still involve a certain amount of approximation. The conventional log-law-based wall functions, however, have limitations in even incompressible cases, which are further compounded when applied to high-speed compressible flows. The objective of this study is to examine the performance of an advanced analytical wall-function treatment which has been successfully used in a range of incompressible flows and explore how compressibility effects could be accounted for in such approaches. The starting point was the implementation of the analytical wall function proposed by Craft et al (2002) in OpenFoam and its subsequent use for the prediction of the impinging shock interaction and compression corner cases up to a Mach number of 3. The wall pressure and skin friction results obtained by the original version result in improvements over those of the standard wall function (log-law based) and are close to those obtained by the low-Re number modelling for supersonic flows. However, an unphysical behaviour is encountered when applying it to higher Mach number cases. A compressible flow version of the analytical wall function is proposed which includes the following modifications: a)inclusion of thermal dissipation terms in the analytical equation for the energy variation over the near-wall cells, b) Variable molecular viscosity (due to temperature variations) over the viscous sub-layer, c) improved variation of the convection terms in the near-wall cell analytical equations. The resultant model has been applied to the above flows up to Mach numbers of 9 and comparisons drawn with experimental data and with predictions from the log-law based wall functions and from the Low-Re Launder and Sharma model. The present results are consistently closer to the data than those of other wall functions in some instances even better than those of the low-Re number. Improvements are especially noticeable in the prediction of the wall heat flux rates, where the log-law wall function generally predicts too low values in the shock interaction region, while the low-Re model, predicts too high heat transfer rates in the highest Mach number cases, as a result of overpredicting turbulence levels where extremely rapid near-wall temperature variations are found. Advisors/Committee Members: CRAFT, TIMOTHY TJ, Iacovides, Hector, Craft, Timothy.

Subjects/Keywords: wall functions; Shock wave/turbulence boundary layer interactions; turbulence modelling; analytical wall function

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, X. (2019). Advanced RANS and Near-Wall Turbulence Modelling for High-Speed Flow. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318489

Chicago Manual of Style (16^th Edition):

Wang, Xinguang. “Advanced RANS and Near-Wall Turbulence Modelling for High-Speed Flow.” 2019. Doctoral Dissertation, University of Manchester. Accessed December 08, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318489.

MLA Handbook (7^th Edition):

Wang, Xinguang. “Advanced RANS and Near-Wall Turbulence Modelling for High-Speed Flow.” 2019. Web. 08 Dec 2019.

Vancouver:

Wang X. Advanced RANS and Near-Wall Turbulence Modelling for High-Speed Flow. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2019 Dec 08]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318489.

Council of Science Editors:

Wang X. Advanced RANS and Near-Wall Turbulence Modelling for High-Speed Flow. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318489

University of Manchester

8. Wang, Xinguang. Advanced RANS and near-wall turbulence modelling for high-speed flow.

Degree: PhD, 2019, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/advanced-rans-and-nearwall-turbulence-modelling-for-highspeed-flow(df8b2eb0-4471-45cf-a807-3a8b5c858f3b).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.771487

► This research focuses on the development of wall functions suitable for the prediction of high-speed compressible flows. Wall-functions avoid the need for prohibitively expensive fine… (more)

▼ This research focuses on the development of wall functions suitable for the prediction of high-speed compressible flows. Wall-functions avoid the need for prohibitively expensive fine near-wall meshes and low-Re models of turbulence which still involve a certain amount of approximation. The conventional log-law-based wall functions, however, have limitations in even incompressible cases, which are further compounded when applied to high-speed compressible flows. The objective of this study is to examine the performance of an advanced analytical wall-function treatment which has been successfully used in a range of incompressible flows and explore how compressibility effects could be accounted for in such approaches. The starting point was the implementation of the analytical wall function proposed by Craft et al (2002) in OpenFoam and its subsequent use for the prediction of the impinging shock interaction and compression corner cases up to a Mach number of 3. The wall pressure and skin friction results obtained by the original version result in improvements over those of the standard wall function (log-law based) and are close to those obtained by the low-Re number modelling for supersonic flows. However, an unphysical behaviour is encountered when applying it to higher Mach number cases. A compressible flow version of the analytical wall function is proposed which includes the following modifications: a)inclusion of thermal dissipation terms in the analytical equation for the energy variation over the near-wall cells, b) Variable molecular viscosity (due to temperature variations) over the viscous sub-layer, c) improved variation of the convection terms in the near-wall cell analytical equations. The resultant model has been applied to the above flows up to Mach numbers of 9 and comparisons drawn with experimental data and with predictions from the log-law based wall functions and from the Low-Re Launder and Sharma model. The present results are consistently closer to the data than those of other wall functions in some instances even better than those of the low-Re number. Improvements are especially noticeable in the prediction of the wall heat flux rates, where the log-law wall function generally predicts too low values in the shock interaction region, while the low-Re model, predicts too high heat transfer rates in the highest Mach number cases, as a result of overpredicting turbulence levels where extremely rapid near-wall temperature variations are found.

Subjects/Keywords: Shock wave/turbulence boundary layer interactions; wall functions; turbulence modelling; analytical wall function

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APA (6^th Edition):

Wang, X. (2019). Advanced RANS and near-wall turbulence modelling for high-speed flow. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/advanced-rans-and-nearwall-turbulence-modelling-for-highspeed-flow(df8b2eb0-4471-45cf-a807-3a8b5c858f3b).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.771487

Chicago Manual of Style (16^th Edition):

Wang, Xinguang. “Advanced RANS and near-wall turbulence modelling for high-speed flow.” 2019. Doctoral Dissertation, University of Manchester. Accessed December 08, 2019. https://www.research.manchester.ac.uk/portal/en/theses/advanced-rans-and-nearwall-turbulence-modelling-for-highspeed-flow(df8b2eb0-4471-45cf-a807-3a8b5c858f3b).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.771487.

MLA Handbook (7^th Edition):

Wang, Xinguang. “Advanced RANS and near-wall turbulence modelling for high-speed flow.” 2019. Web. 08 Dec 2019.

Vancouver:

Wang X. Advanced RANS and near-wall turbulence modelling for high-speed flow. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2019 Dec 08]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/advanced-rans-and-nearwall-turbulence-modelling-for-highspeed-flow(df8b2eb0-4471-45cf-a807-3a8b5c858f3b).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.771487.

Council of Science Editors:

Wang X. Advanced RANS and near-wall turbulence modelling for high-speed flow. [Doctoral Dissertation]. University of Manchester; 2019. Available from: https://www.research.manchester.ac.uk/portal/en/theses/advanced-rans-and-nearwall-turbulence-modelling-for-highspeed-flow(df8b2eb0-4471-45cf-a807-3a8b5c858f3b).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.771487

Virginia Tech

9. Forest, Jonathan Bradley. The Wall Pressure Spectrum of High Reynolds Number Rough-Wall Turbulent Boundary Layers.

Degree: MS, Aerospace and Ocean Engineering, 2012, Virginia Tech

URL: http://hdl.handle.net/10919/31114

► The presence of roughness on a surface subject to high Reynolds number flows promotes the formation of a turbulent boundary layer and the generation of… (more)

▼ The presence of roughness on a surface subject to high Reynolds number flows promotes the formation of a turbulent boundary layer and the generation of a fluctuating pressure field imposed on the surface. While numerous studies have investigated the wall pressure fluctuations over zero-pressure gradient smooth walls, few studies have examined the effects of surface roughness on the wall pressure field. Additionally, due to the difficulties in obtaining high Reynolds number flows over fully rough surfaces in laboratory settings, an even fewer number of studies have investigated this phenomenon under flow conditions predicted to be fully free of transitional effects that would ensure similarity laws could be observed. This study presents the efforts to scale and describe the wall pressure spectrum of a rough wall, high Reynolds number turbulent boundary layer free of transitional effects. Measurements were taken in the Virginia Tech Stability Wind Tunnel for both smooth and rough walls. A deterministic roughness fetch composed of 3-mm hemispheres arranged in a 16.5-mm square array was used for the rough surface. Smooth and rough wall flows were examined achieving Reynolds numbers up to Re_Î¸ = 68700 and Re_Î¸ = 80200 respectively, with the rough wall flows reaching roughness based Reynolds numbers up to k_g⁺ = 507 with a simultaneous blockage ratio of Î´/k_g = 76. A new roughness based inner variable scaling is proposed that provides a much more complete collapse of the rough wall pressure spectra than previous scales had provided over a large range of Reynolds numbers and roughness configurations. This scaling implies the presence of two separate time scales associated with the near wall turbulence structure generation. A clearly defined overlap region was observed for the rough wall surface pressure spectra displaying a frequency dependence of Ï ^-1.33, believed to be a function of the surface roughness configuration and its associated transport of turbulent energy. The rough wall pressure spectra were shown to decay more rapidly, but based on the same function as what defined the smooth wall decay. Advisors/Committee Members: Devenport, William J. (committeechair), Schetz, Joseph A. (committee member), Lowe, Kevin Todd (committee member), Anderson, Jason (committee member).

Subjects/Keywords: high Reynolds number; rough wall; turbulent boundary layer; surface pressure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Forest, J. B. (2012). The Wall Pressure Spectrum of High Reynolds Number Rough-Wall Turbulent Boundary Layers. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31114

Chicago Manual of Style (16^th Edition):

Forest, Jonathan Bradley. “The Wall Pressure Spectrum of High Reynolds Number Rough-Wall Turbulent Boundary Layers.” 2012. Masters Thesis, Virginia Tech. Accessed December 08, 2019. http://hdl.handle.net/10919/31114.

MLA Handbook (7^th Edition):

Forest, Jonathan Bradley. “The Wall Pressure Spectrum of High Reynolds Number Rough-Wall Turbulent Boundary Layers.” 2012. Web. 08 Dec 2019.

Vancouver:

Forest JB. The Wall Pressure Spectrum of High Reynolds Number Rough-Wall Turbulent Boundary Layers. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10919/31114.

Council of Science Editors:

Forest JB. The Wall Pressure Spectrum of High Reynolds Number Rough-Wall Turbulent Boundary Layers. [Masters Thesis]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/31114

Virginia Tech

10. Meyers, Timothy Wade. The Rough Wall High Reynolds Number Turbulent Boundary Layer Surface Pressure Spectrum.

Degree: MS, Aerospace and Ocean Engineering, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/25880

► There have been very few studies investigating the rough wall pressure spectra under fully rough flows, which are relevant to many common engineering applications operating… (more)

Subjects/Keywords: Rough wall; high Reynolds number; turbulent boundary layer; surface pressure fluctuations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Meyers, T. W. (2014). The Rough Wall High Reynolds Number Turbulent Boundary Layer Surface Pressure Spectrum. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/25880

Chicago Manual of Style (16^th Edition):

Meyers, Timothy Wade. “The Rough Wall High Reynolds Number Turbulent Boundary Layer Surface Pressure Spectrum.” 2014. Masters Thesis, Virginia Tech. Accessed December 08, 2019. http://hdl.handle.net/10919/25880.

MLA Handbook (7^th Edition):

Meyers, Timothy Wade. “The Rough Wall High Reynolds Number Turbulent Boundary Layer Surface Pressure Spectrum.” 2014. Web. 08 Dec 2019.

Vancouver:

Meyers TW. The Rough Wall High Reynolds Number Turbulent Boundary Layer Surface Pressure Spectrum. [Internet] [Masters thesis]. Virginia Tech; 2014. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10919/25880.

Council of Science Editors:

Meyers TW. The Rough Wall High Reynolds Number Turbulent Boundary Layer Surface Pressure Spectrum. [Masters Thesis]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/25880

University of Melbourne

11. Squire, Dougal Thomas. The structure and scaling of rough-wall turbulent boundary layers.

Degree: 2017, University of Melbourne

URL: http://hdl.handle.net/11343/168286

► Turbulent wall layers are a pervasive and influential feature in nature and engineering; common examples include the atmospheric and benthic layer, boundary layers developing on… (more)

▼ Turbulent wall layers are a pervasive and influential feature in nature and engineering; common examples include the atmospheric and benthic layer, boundary layers developing on aerial, marine and terrestrial vehicles, and flows in piping networks. These flows are characterised by high Reynolds numbers and, more often than not, surface roughness that exerts a dynamical effect on the flow. The latter may result from manufacturing defects, erosion and/or deposition, including that of living organisms. In this thesis, rough-wall turbulent boundary layers are investigated experimentally across an unprecedented range of boundary layer and roughness parameters. The measurements presented herein were performed above a well-characterised sand grain roughness using four experimental techniques, including hot-wire anemometry and particle image velocimetry. A floating element drag balance was used to obtain accurate estimates of the wall drag and associated parameters. New and existing smooth-wall measurements using the same experimental arrangements have been obtained for comparative purposes. Statistics and spectra of the streamwise velocity component reveal convincing support for Townsend's Reynolds number similarity hypothesis (The Structure of Turbulent Shear Flow, vol. 1, 1956, Cambridge University Press.) when the friction Reynolds number, delta+ > 14,000. Wall-similarity is also observed at much lower friction Reynolds numbers when the roughness Reynolds number is high (i.e. the flow is fully rough). Subtraction of smooth- and rough-wall streamwise velocity spectra at matched friction Reynolds number demonstrates that the differences between the near-wall inner-normalised energy of these flows occurs predominantly for scales on the order of the boundary layer thickness (typically, several hundred times the characteristic roughness height). This is most apparent when the flow is fully rough. To the author's knowledge, outer-region flow dependence on the roughness Reynolds number has not been previously identified. At high roughness Reynolds number, wall-similarity is also observed for the spatial structure of the outer region. This is true over the three orders of magnitude of streamwise scales resolved by the present PIV measurements. Remarkably, spatial similarity between smooth- and rough-wall flows is even observed at wall-normal locations where large scale differences are apparent in the respective energy spectra. Particular attention is given to the spanwise vorticity structure in the outer region of rough-wall flows. This is motivated by suggestions from previous rough-wall studies that the structure of vortical events in the outer regions may be particularly susceptible to changes to the wall boundary condition. Our data suggest, however, that the present sand grain roughness does not influence outer-region vorticity structure at high roughness Reynolds numbers beyond Townsend's hypothesis. Issues with applying Taylor's frozen turbulence hypothesis (Proceedings of the Royal Society of London A, vol. 164,…

Subjects/Keywords: wall-bounded turbulence; boundary layer flows; rough walls

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APA (6^th Edition):

Squire, D. T. (2017). The structure and scaling of rough-wall turbulent boundary layers. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/168286

Chicago Manual of Style (16^th Edition):

Squire, Dougal Thomas. “The structure and scaling of rough-wall turbulent boundary layers.” 2017. Doctoral Dissertation, University of Melbourne. Accessed December 08, 2019. http://hdl.handle.net/11343/168286.

MLA Handbook (7^th Edition):

Squire, Dougal Thomas. “The structure and scaling of rough-wall turbulent boundary layers.” 2017. Web. 08 Dec 2019.

Vancouver:

Squire DT. The structure and scaling of rough-wall turbulent boundary layers. [Internet] [Doctoral dissertation]. University of Melbourne; 2017. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/11343/168286.

Council of Science Editors:

Squire DT. The structure and scaling of rough-wall turbulent boundary layers. [Doctoral Dissertation]. University of Melbourne; 2017. Available from: http://hdl.handle.net/11343/168286

University of Melbourne

12. CHAN, LEON. Direct numerical simulation of rough wall pipe flows.

Degree: 2016, University of Melbourne

URL: http://hdl.handle.net/11343/110975

► Direct Numerical Simulations (DNSs) were conducted in a turbulent rough wall pipe with three-dimensional sinusoidal roughness using a conforming grid. The wealth of information provided… (more)

Subjects/Keywords: rough wall pipe; boundary layer; computational fluid dynamics

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APA (6^th Edition):

CHAN, L. (2016). Direct numerical simulation of rough wall pipe flows. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/110975

Chicago Manual of Style (16^th Edition):

CHAN, LEON. “Direct numerical simulation of rough wall pipe flows.” 2016. Doctoral Dissertation, University of Melbourne. Accessed December 08, 2019. http://hdl.handle.net/11343/110975.

MLA Handbook (7^th Edition):

CHAN, LEON. “Direct numerical simulation of rough wall pipe flows.” 2016. Web. 08 Dec 2019.

Vancouver:

CHAN L. Direct numerical simulation of rough wall pipe flows. [Internet] [Doctoral dissertation]. University of Melbourne; 2016. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/11343/110975.

Council of Science Editors:

CHAN L. Direct numerical simulation of rough wall pipe flows. [Doctoral Dissertation]. University of Melbourne; 2016. Available from: http://hdl.handle.net/11343/110975

University of Wisconsin – Milwaukee

13. Hasegawa, Takahiko. A Study of the Development of an Analytical Wall Function for Large Eddy Simulation of Turbulent Channel and Rectangular Duct Flow.

Degree: MS, Engineering, 2014, University of Wisconsin – Milwaukee

URL: https://dc.uwm.edu/etd/551

► This paper reports computational work of three-dimensional channel turbulent flow and rectangular duct flow with the Analytical Wall Function (AWF). The main purpose of… (more)

Subjects/Keywords: Boundary Layer; CFD; Channel; Duct; LES; Wall Function; Mechanical Engineering

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APA (6^th Edition):

Hasegawa, T. (2014). A Study of the Development of an Analytical Wall Function for Large Eddy Simulation of Turbulent Channel and Rectangular Duct Flow. (Thesis). University of Wisconsin – Milwaukee. Retrieved from https://dc.uwm.edu/etd/551

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hasegawa, Takahiko. “A Study of the Development of an Analytical Wall Function for Large Eddy Simulation of Turbulent Channel and Rectangular Duct Flow.” 2014. Thesis, University of Wisconsin – Milwaukee. Accessed December 08, 2019. https://dc.uwm.edu/etd/551.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hasegawa, Takahiko. “A Study of the Development of an Analytical Wall Function for Large Eddy Simulation of Turbulent Channel and Rectangular Duct Flow.” 2014. Web. 08 Dec 2019.

Vancouver:

Hasegawa T. A Study of the Development of an Analytical Wall Function for Large Eddy Simulation of Turbulent Channel and Rectangular Duct Flow. [Internet] [Thesis]. University of Wisconsin – Milwaukee; 2014. [cited 2019 Dec 08]. Available from: https://dc.uwm.edu/etd/551.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hasegawa T. A Study of the Development of an Analytical Wall Function for Large Eddy Simulation of Turbulent Channel and Rectangular Duct Flow. [Thesis]. University of Wisconsin – Milwaukee; 2014. Available from: https://dc.uwm.edu/etd/551

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Florida Atlantic University

14. Gonzalez, Alexander J. A Computational Analysis of Bio-Inspired Modified Boundary Layers for Acoustic Pressure Shielding in A Turbulent Wall Jet.

Degree: MS, 2019, Florida Atlantic University

URL: http://purl.flvc.org/fau/fd/FA00013209

►

Summary: Surface pressure fluctuations developed by turbulent flow within a boundary layer is a major cause of flow noise from a body and an issue… (more)

Subjects/Keywords: Turbulent flow; Turbulent boundary layer; Computational fluid dynamics; Wall jets

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APA (6^th Edition):

Gonzalez, A. J. (2019). A Computational Analysis of Bio-Inspired Modified Boundary Layers for Acoustic Pressure Shielding in A Turbulent Wall Jet. (Masters Thesis). Florida Atlantic University. Retrieved from http://purl.flvc.org/fau/fd/FA00013209

Chicago Manual of Style (16^th Edition):

Gonzalez, Alexander J. “A Computational Analysis of Bio-Inspired Modified Boundary Layers for Acoustic Pressure Shielding in A Turbulent Wall Jet.” 2019. Masters Thesis, Florida Atlantic University. Accessed December 08, 2019. http://purl.flvc.org/fau/fd/FA00013209.

MLA Handbook (7^th Edition):

Gonzalez, Alexander J. “A Computational Analysis of Bio-Inspired Modified Boundary Layers for Acoustic Pressure Shielding in A Turbulent Wall Jet.” 2019. Web. 08 Dec 2019.

Vancouver:

Gonzalez AJ. A Computational Analysis of Bio-Inspired Modified Boundary Layers for Acoustic Pressure Shielding in A Turbulent Wall Jet. [Internet] [Masters thesis]. Florida Atlantic University; 2019. [cited 2019 Dec 08]. Available from: http://purl.flvc.org/fau/fd/FA00013209.

Council of Science Editors:

Gonzalez AJ. A Computational Analysis of Bio-Inspired Modified Boundary Layers for Acoustic Pressure Shielding in A Turbulent Wall Jet. [Masters Thesis]. Florida Atlantic University; 2019. Available from: http://purl.flvc.org/fau/fd/FA00013209

University of Texas – Austin

15. Ulerich, Rhys David. Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles.

Degree: PhD, Computational Science, Engineering, and Mathematics, 2014, University of Texas – Austin

URL: http://hdl.handle.net/2152/26886

► Turbulent boundary layers approximating those found on the NASA Orion Multi-Purpose Crew Vehicle (MPCV) thermal protection system during atmospheric reentry from the International Space Station… (more)

▼ Turbulent boundary layers approximating those found on the NASA Orion Multi-Purpose Crew Vehicle (MPCV) thermal protection system during atmospheric reentry from the International Space Station have been studied by direct numerical simulation, with the ultimate goal of reducing aerothermodynamic heating prediction uncertainty. Simulations were performed using a new, well-verified, openly available Fourier/B-spline pseudospectral code called Suzerain equipped with a ``slow growth'' spatiotemporal homogenization approximation recently developed by Topalian et al. A first study aimed to reduce turbulence-driven heating prediction uncertainty by providing high-quality data suitable for calibrating Reynolds-averaged Navier – Stokes turbulence models to address the atypical boundary layer characteristics found in such reentry problems. The two data sets generated were Ma[approximate symbol] 0.9 and 1.15 homogenized boundary layers possessing Re[subscript theta, approximate symbol] 382 and 531, respectively. Edge-to-wall temperature ratios, T[subscript e]/T[subscript w], were close to 4.15 and wall blowing velocities, v[subscript w, superscript plus symbol]= v[subscript w]/u[subscript tau], were about 8 x 10-3 . The favorable pressure gradients had Pohlhausen parameters between 25 and 42. Skin frictions coefficients around 6 x10-3 and Nusselt numbers under 22 were observed. Near-wall vorticity fluctuations show qualitatively different profiles than observed by Spalart (J. Fluid Mech. 187 (1988)) or Guarini et al. (J. Fluid Mech. 414 (2000)). Small or negative displacement effects are evident. Uncertainty estimates and Favre-averaged equation budgets are provided. A second study aimed to reduce transition-driven uncertainty by determining where on the thermal protection system surface the boundary layer could sustain turbulence. Local boundary layer conditions were extracted from a laminar flow solution over the MPCV which included the bow shock, aerothermochemistry, heat shield surface curvature, and ablation. That information, as a function of leeward distance from the stagnation point, was approximated by Re[subscript theta], Ma[subscript e], [mathematical equation], v[subscript w, superscript plus sign], and T[subscript e]/T[subscript w] along with perfect gas assumptions. Homogenized turbulent boundary layers were initialized at those local conditions and evolved until either stationarity, implying the conditions could sustain turbulence, or relaminarization, implying the conditions could not. Fully turbulent fields relaminarized subject to conditions 4.134 m and 3.199 m leeward of the stagnation point. However, different initial conditions produced long-lived fluctuations at leeward position 2.299 m. Locations more than 1.389 m leeward of the stagnation point are predicted to sustain turbulence in this scenario. Advisors/Committee Members: Moser, Robert deLancey (advisor).

Subjects/Keywords: Atmospheric reentry; B-spline collocation; Channel flow; Cold wall; Direct numerical simulation; Energy perturbation method; Favorable pressure gradient; Flat plate; Homogenized boundary layer; Inviscid base flow; Isothermal wall; Low Reynolds number; Manufactured solution; NASA Orion; Negative displacement thickness; Predictive computation; Pseudospectral method; Radial nozzle; Reducing uncertainty; Reentry vehicle; Relaminarization; Sampling uncertainty; Simulation framework; Slow growth formulation; Software verification; Transition modeling; Turbulence budgets; Turbulent boundary layer; Wall blowing; Wall transpiration

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APA (6^th Edition):

Ulerich, R. D. (2014). Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/26886

Chicago Manual of Style (16^th Edition):

Ulerich, Rhys David. “Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles.” 2014. Doctoral Dissertation, University of Texas – Austin. Accessed December 08, 2019. http://hdl.handle.net/2152/26886.

MLA Handbook (7^th Edition):

Ulerich, Rhys David. “Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles.” 2014. Web. 08 Dec 2019.

Vancouver:

Ulerich RD. Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2014. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/2152/26886.

Council of Science Editors:

Ulerich RD. Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles. [Doctoral Dissertation]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/26886

Penn State University

16. Eipper, Daniel. INLAND STRUCTURE AND PENETRATION OF LAKE ONTARIO LAKE-EFFECT DOMINANT BANDS IN BAROCLINIC ENVIRONMENTS.

Degree: 2017, Penn State University

URL: https://etda.libraries.psu.edu/catalog/14614dte108

► Lake-effect snowstorms are often observed to form singleor, occasionally, doubleband structures that are either solitary or considerably larger than any additional lake-effect structures. These bands,… (more)

▼ Lake-effect snowstorms are often observed to form singleor, occasionally, doubleband structures that are either solitary or considerably larger than any additional lake-effect structures. These bands, classified in this study as dominant bands, commonly produce heavy, localized snowfall and extend significant distances inland, resulting in high societal impact. Hazards associated with these bands underscore the importance of understanding the inland structure of dominant bands and accurately forecasting their inland extent. Accordingly, the first focus of this dissertation is on elucidating those factors important to the inland penetration of Lake Ontario Lake-Long-Axis Parallel (LLAP) bands (LLAP bands are a subset of dominant bands and occur frequently over and downwind of Lake Ontario). Statistical relationships between the inland penetration of LLAP-band radar echoes and environmental variables are examined for 34 cases of LLAP bands observed during the Ontario Winter Lake-effect Systems (OWLeS) field campaign. This analysis reveals that inland penetration is strongly correlated with boundary layer depth and with cold air advection in the upper portion of the boundary layer. The latter result suggests that boundary-layer destabilization produced by vertically-differential cold air advection may be an inland power source for preexisting LLAP bands; this power production is quantified through atmospheric energetics. Statistical models for predicting inland penetration are also developed using stepwise regression. The most skillful of these models uses boundary layer depth and temperature advection in the upper portion of the boundary layer to explain 76% of the variance in observed inland penetration (when tested on independent data). The second focus of this work is on the inland structure of dominant bands and the interaction of these bands with environmental baroclinicity. Band structure is examined using WRF reanalyses with 3 km horizontal resolution and an innovative technique for assessing the most representative member from the WRF ensemble. Three reanalysis periods are examined, encompassing 185 total simulation hours; of these hours, dominant bands were detected during 155 hours. It is discovered that, within the reanalysis periods, synoptic-scale baroclinicity is common in both the east-west and north-south dimensions; the various sources of this baroclinicity are also discussed. Three simulation hours are then selected for in-depth case studies. These case studies reveal a wide range of interactions of dominant bands with synoptic-scale baroclinicity, which are discussed in detail. The case studies suggest that baroclinicity strongly influences the inland structure of dominant bands. Finally, the synthesis and implications of these results are discussed. Advisors/Committee Members: George Spencer Young, Dissertation Advisor.

Subjects/Keywords: Lake-effect; Snowbands; Cold Air Advection; Boundary Layer; Mesoscale; Baroclinic

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APA (6^th Edition):

Eipper, D. (2017). INLAND STRUCTURE AND PENETRATION OF LAKE ONTARIO LAKE-EFFECT DOMINANT BANDS IN BAROCLINIC ENVIRONMENTS. (Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/14614dte108

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Eipper, Daniel. “INLAND STRUCTURE AND PENETRATION OF LAKE ONTARIO LAKE-EFFECT DOMINANT BANDS IN BAROCLINIC ENVIRONMENTS.” 2017. Thesis, Penn State University. Accessed December 08, 2019. https://etda.libraries.psu.edu/catalog/14614dte108.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Eipper, Daniel. “INLAND STRUCTURE AND PENETRATION OF LAKE ONTARIO LAKE-EFFECT DOMINANT BANDS IN BAROCLINIC ENVIRONMENTS.” 2017. Web. 08 Dec 2019.

Vancouver:

Eipper D. INLAND STRUCTURE AND PENETRATION OF LAKE ONTARIO LAKE-EFFECT DOMINANT BANDS IN BAROCLINIC ENVIRONMENTS. [Internet] [Thesis]. Penn State University; 2017. [cited 2019 Dec 08]. Available from: https://etda.libraries.psu.edu/catalog/14614dte108.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Eipper D. INLAND STRUCTURE AND PENETRATION OF LAKE ONTARIO LAKE-EFFECT DOMINANT BANDS IN BAROCLINIC ENVIRONMENTS. [Thesis]. Penn State University; 2017. Available from: https://etda.libraries.psu.edu/catalog/14614dte108

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Cincinnati

17. Bhide, Kalyani R. Shock Boundary Layer Interactions - A Multiphysics Approach.

Degree: MS, Engineering and Applied Science: Mechanical Engineering, 2018, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543994392025663

► Shock waves are a major source of drag in supersonic flows as they affect the aero-thermodynamicperformance and impose pressure and temperature loads on the structure… (more)

▼ Shock waves are a major source of drag in supersonic flows as they affect the aero-thermodynamicperformance and impose pressure and temperature loads on the structure under consideration.The aim of this work is to address such multiphysics phenomenon and mitigate the losses dueto shock waves in a series of low to high aspect ratio rectangular supersonic nozzles with sharpand smooth throats.3D steady RANS CFD is performed on a baseline converging-diverging nozzle (exit aspectratio 2 and design Mach number 1.5) with sharp throat and the results are validated with theexperimental data. Turbulence model study shows that k-omega SST compares better with theexperimental data. A shock wave is present in the baseline nozzle due to the sharp throat. Inorder to eliminate the sharp throat, a general-purpose curve generator - Gencurve is developedand implemented using Python 3.5. Equivalent smooth nozzle geometries are created usingthis tool. These show improvements in various performance parameters such as dischargecoefficients, thrust coefficients, etc., due to the mitigated shocks and reduced boundary layerthicknesses.The baseline and the equivalent smooth nozzle geometries are further analyzed at design(NPR 3.67) and off-design conditions using multi-physics simulations, which are, for the firsttime, performed on rectangular supersonic nozzles. This work highlights the significance ofFluid-Thermal-Structural-Interaction (FTSI) simulations as a diagnosis of existing designs (exitaspect ratio 2 with sharp throat) and as a means of preliminary investigation to ensure feasibilityof new designs before conducting experimental and field tests. Structural deformation in thebaseline design is far less than the boundary layer thickness as the impact of Shock BoundaryLayer Interactions (SBLI) is not as severe. FTSI demonstrates that the discharge coefficient ofthe improved design is 0.99 and its structural integrity remains intact at off-design conditions.This proves the feasibility of the improved design. Although the influence of FTSI is shownfor a nozzle, the approach is general and essential in any product design cycle or as a preludeto building prototypes.Investigating low (1, 2, 3) and high (8, 12) aspect ratio nozzles with sharp throats is also afocus of this work. Although the throat shocks are present in these configurations, they becomeweaker and the shock cell size reduces as the aspect ratio increases. Hence, the magnitudeof wall shear stress at the nozzle throat decreases. The boundary layer thickness on nozzleexit plane along the minor axis decreases as the aspect ratio increases. This improves thedischarge coefficient due to the less blockage offered by the boundary layer. All jets spreadmore in the minor axis than in the major axis and eventually become circular a few diametersdownstream the nozzle exit. The velocity decay in high aspect ratio nozzles is faster than inthe low aspect ratio nozzles. An issue of modeling quarter section of the flow domain usingsymmetry boundary conditions is also addressed. Advisors/Committee Members: Abdallah, Shaaban (Committee Chair).

Subjects/Keywords: Aerospace Materials; Rectangular supersonic nozzles; Multiphysics; shock boundary layer interactions; aspect ratio; wall curve; boundary layer

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APA (6^th Edition):

Bhide, K. R. (2018). Shock Boundary Layer Interactions - A Multiphysics Approach. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543994392025663

Chicago Manual of Style (16^th Edition):

Bhide, Kalyani R. “Shock Boundary Layer Interactions - A Multiphysics Approach.” 2018. Masters Thesis, University of Cincinnati. Accessed December 08, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543994392025663.

MLA Handbook (7^th Edition):

Bhide, Kalyani R. “Shock Boundary Layer Interactions - A Multiphysics Approach.” 2018. Web. 08 Dec 2019.

Vancouver:

Bhide KR. Shock Boundary Layer Interactions - A Multiphysics Approach. [Internet] [Masters thesis]. University of Cincinnati; 2018. [cited 2019 Dec 08]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543994392025663.

Council of Science Editors:

Bhide KR. Shock Boundary Layer Interactions - A Multiphysics Approach. [Masters Thesis]. University of Cincinnati; 2018. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543994392025663

18. Zhang, Yufang. Coupled convective heat transfer and radiative energy transfer in turbulent boundary layers : Transferts couplés par convection et rayonnement dans la couche limite turbulente.

Degree: Docteur es, Energétique, 2013, Châtenay-Malabry, Ecole centrale de Paris

URL: http://www.theses.fr/2013ECAP0051

► Le rayonnement joue un rôle important dans de nombreuses applications industrielles, en particulier celles mettant en jeu un processus de combustion. Cependant, son influence sur… (more)

▼ Le rayonnement joue un rôle important dans de nombreuses applications industrielles, en particulier celles mettant en jeu un processus de combustion. Cependant, son influence sur les écoulements turbulents, notamment les couches limites, n’est pas encore bien connu. L’objectif est ici d’analyser en détail l’effet du rayonnement sur les écoulements turbulents. Utilisant le modèle CK pour décrire les propriétés radiatives des gaz, une approche optimisée de la méthode de Monte-Carlo (OERM) basée sur l’émission et le principe de réciprocité est développée. La méthode OERM permet de contrôler localement l’imprécision des résultats tout en corrigeant l’inconvénient de la méthode originale en introduisant une nouvelle fonction de répartition des fréquences basée sur la température maximale du domaine. Plusieurs écoulements de canal plan turbulent sous différentes conditions de pression, de températures et d’émissivités de parois sont résolus par simulation numérique directe (DNS). Les simulations DNS de l’écoulement et du champ de rayonnement par la méthode OERM sont entièrement couplées. L’impact du rayonnement sur le champ moyen de température et ses fluctuations est analysé en détail. La modification du profil de température moyenne induit un changement des flux de chaleur conductifs aux parois et de nouvelles lois de paroi pour la température lorsque le rayonnement est pris en compte. L’impact sur les fluctuations de température et le flux de chaleur par transport turbulent est étudié au travers de leurs équations de transport respectives dont l’équilibre est modifié par le rayonnement. Une nouvelle normalisation (wall-scaling) basée sur le bilan d’énergie est proposée pour améliorer le recouvrement des profils obtenus sous les différentes configurations étudiées avec et sans transfert radiatif. Cette normalisation permet d’introduire un modèle pour le nombre de Prandtl turbulent lorsque le rayonnement est pris en compte. Afin de prédire l’effet du rayonnement sur la zone proche paroi et sa modification des lois de paroi, un modèle de paroi pour la simulation aux grandes échelles (LES) est développé. Les équations 1D de couche limite turbulente à l’équilibre sont résolues sur une grille intégrée au maillage LES pour traiter la zone interne. La contrainte pariétale et le flux de chaleur conductif obtenus sont renvoyés au code LES. La puissance radiative dans l’équation d’énergie du modèle de paroi 1D est évaluée à partir d’un modèle analytique. Le modèle de paroi est validé par comparaison avec les résultats des calculs couplés DNS/Monte-Carlo. Deux critères sont finalement proposés et validés. Le premier a pour but de prédire l’importance du flux radiatif pariétal tandis que le second détermine si un modèle de paroi prenant en compte l’effet du rayonnement dans la zone interne de la couche limite est nécessaire. Une étude paramétrique est ensuite réalisée où un modèle κ-ϵ et un modèle de nombre de Prandtl turbulent sont utilisés pour estimer les champs moyens de vitesse et température d’écoulements de canal plan sous… Advisors/Committee Members: Gicquel, Olivier (thesis director), Taine, Jean (thesis director).

Subjects/Keywords: Modèle de couche limite; Rayonnement; Couche limite; Wall model; Radiation; Boundary layer

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APA (6^th Edition):

Zhang, Y. (2013). Coupled convective heat transfer and radiative energy transfer in turbulent boundary layers : Transferts couplés par convection et rayonnement dans la couche limite turbulente. (Doctoral Dissertation). Châtenay-Malabry, Ecole centrale de Paris. Retrieved from http://www.theses.fr/2013ECAP0051

Chicago Manual of Style (16^th Edition):

Zhang, Yufang. “Coupled convective heat transfer and radiative energy transfer in turbulent boundary layers : Transferts couplés par convection et rayonnement dans la couche limite turbulente.” 2013. Doctoral Dissertation, Châtenay-Malabry, Ecole centrale de Paris. Accessed December 08, 2019. http://www.theses.fr/2013ECAP0051.

MLA Handbook (7^th Edition):

Zhang, Yufang. “Coupled convective heat transfer and radiative energy transfer in turbulent boundary layers : Transferts couplés par convection et rayonnement dans la couche limite turbulente.” 2013. Web. 08 Dec 2019.

Vancouver:

Zhang Y. Coupled convective heat transfer and radiative energy transfer in turbulent boundary layers : Transferts couplés par convection et rayonnement dans la couche limite turbulente. [Internet] [Doctoral dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2013. [cited 2019 Dec 08]. Available from: http://www.theses.fr/2013ECAP0051.

Council of Science Editors:

Zhang Y. Coupled convective heat transfer and radiative energy transfer in turbulent boundary layers : Transferts couplés par convection et rayonnement dans la couche limite turbulente. [Doctoral Dissertation]. Châtenay-Malabry, Ecole centrale de Paris; 2013. Available from: http://www.theses.fr/2013ECAP0051

Virginia Tech

19. Awasthi, Manuj. High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps.

Degree: MS, Aerospace and Ocean Engineering, 2012, Virginia Tech

URL: http://hdl.handle.net/10919/33820

► Measurements were made on three forward steps with step height to boundary layer ratio of approximately 3.8%, 15% and 60% and Reynolds number based on… (more)

Subjects/Keywords: turbulent boundary layer; forward facing steps; wall pressure fluctuations; separating-reattaching flow; velocity fluctuation

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APA (6^th Edition):

Awasthi, M. (2012). High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/33820

Chicago Manual of Style (16^th Edition):

Awasthi, Manuj. “High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps.” 2012. Masters Thesis, Virginia Tech. Accessed December 08, 2019. http://hdl.handle.net/10919/33820.

MLA Handbook (7^th Edition):

Awasthi, Manuj. “High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps.” 2012. Web. 08 Dec 2019.

Vancouver:

Awasthi M. High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10919/33820.

Council of Science Editors:

Awasthi M. High Reynolds Number Turbulent Boundary Layer Flow over Small Forward Facing Steps. [Masters Thesis]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/33820

UCLA

20. Trettel, Andrew James. Transformations for variable-property turbulent boundary layers.

Degree: Mechanical Engineering, 2019, UCLA

URL: http://www.escholarship.org/uc/item/9n57p4cv

► The Trettel-Larsson (TL) transformation is extended to two dimensions using mass conservation and an interpretation of Morkovin's hypothesis. This extension reveals the previously unknown limitations… (more)

Subjects/Keywords: Mechanical engineering; Aerospace engineering; Applied mathematics; boundary layer turbulence; compressible turbulent boundary layers; compressible turbulent channel flows; velocity transformation; wall turbulence

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APA (6^th Edition):

Trettel, A. J. (2019). Transformations for variable-property turbulent boundary layers. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/9n57p4cv

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Trettel, Andrew James. “Transformations for variable-property turbulent boundary layers.” 2019. Thesis, UCLA. Accessed December 08, 2019. http://www.escholarship.org/uc/item/9n57p4cv.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Trettel, Andrew James. “Transformations for variable-property turbulent boundary layers.” 2019. Web. 08 Dec 2019.

Vancouver:

Trettel AJ. Transformations for variable-property turbulent boundary layers. [Internet] [Thesis]. UCLA; 2019. [cited 2019 Dec 08]. Available from: http://www.escholarship.org/uc/item/9n57p4cv.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Trettel AJ. Transformations for variable-property turbulent boundary layers. [Thesis]. UCLA; 2019. Available from: http://www.escholarship.org/uc/item/9n57p4cv

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Queens University

21. Banyassady, Rayhaneh. Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces .

Degree: Mechanical and Materials Engineering, 2015, Queens University

URL: http://hdl.handle.net/1974/13076

► Large-eddy simulations were carried out to investigate the flow dynamics of wall jets over smooth and rough surfaces. Results were validated against data in the… (more)

Subjects/Keywords: plane wall-jet; immersed boundary method; large-eddy simulation; inner/outer layer interaction; roughness; radial wall-jet; logarithmic law of the wall

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APA (6^th Edition):

Banyassady, R. (2015). Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/13076

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Banyassady, Rayhaneh. “Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces .” 2015. Thesis, Queens University. Accessed December 08, 2019. http://hdl.handle.net/1974/13076.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Banyassady, Rayhaneh. “Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces .” 2015. Web. 08 Dec 2019.

Vancouver:

Banyassady R. Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces . [Internet] [Thesis]. Queens University; 2015. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/1974/13076.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Banyassady R. Large-Eddy Simulations of Plane and Radial Wall-Jets over Smooth and Rough Surfaces . [Thesis]. Queens University; 2015. Available from: http://hdl.handle.net/1974/13076

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Hong Kong

22. 何溢翹; Ho, Yat-kiu. Wind-tunnel study of turbulent boundary layer over idealised urban roughness with application to urban ventilation problem.

Degree: PhD, 2017, University of Hong Kong

URL: http://hdl.handle.net/10722/240673

► The flows in the lowest part of the urban atmospheric boundary layer (ABL) are investigated in this dissertation. The flow structure is characterised by the… (more)

▼ The flows in the lowest part of the urban atmospheric boundary layer (ABL) are investigated in this dissertation. The flow structure is characterised by the surface morphology that has direct effect on the street-level ventilation. Numerical study using computational fluid dynamics (CFD), wind tunnel experiments and analytical derivation are performed to examine the dynamics in the inner region of a neutral urban ABL. In the first part of the dissertation, the flows over idealised two-dimensional (2D) urban street canyons of different building-height-to-street-width (aspect) ratios (ARs) and urban ABL thickness are numerically investigated from a street canyon point of view. The friction factor f and the air-exchange rate (ACH) are used to parameterise the aerodynamic resistance and the street-level ventilation performance over urban areas respectively. It is found that atmospheric turbulence contributes most to street-level ventilation because the turbulent component of ACH (ACH’’) dominates the transport process (at least 70% of the total ACH). Besides, the collective effect of AR and urban ABL thickness on ACH is reflected by the f. A linear relation between ACH’’ and the square root of friction factor (ACH’’ ∝ f^(1/2)) is revealed. An empirical parameterisation is thus proposed by extrapolating ACH’’ to predict the street-level ventilation efficiency. In the second part of the dissertation, focus is put on the urban ABL adjacent to the urban surfaces (boundary-layer point of view). The dynamics in the inner layer (roughness sublayer RSL and inertial sublayer ISL) of the urban ABLs over either idealised or real complex urban configurations are studied analytically and experimentally. An analytical solution to the mean wind profile which is a continuous function applicable to both RSL and ISL is derived based on the Monin-Obukhov similarity theory (MOST) to account for the RSL effects over urban surfaces. The RSL function is then coupled with the mixing-length model to elucidate how surface roughness alters the RSL turbulence. A series of wind tunnel experiments are performed to measure the turbulent boundary layer structure over idealised surface (in the form of 2D rib-type roughness elements) and real complex urban surfaces (an urban model of Hong Kong) using hot-wire anemometry (HWA). The analytical prediction agrees well with the experimental result that improves the estimate to mean velocity profiles and turbulence length scales in the near-ground region over urban areas. Consolidating the analytical and experimental results, it is confirmed that the inner layer flows over urban areas exhibit two distinct behaviours: 1) logarithmic properties in the ISL and 2) physical influence of individual buildings on near-surface RSL flows are demonstrated in which the RSL effects should be taken in account. Finally, an improved ventilation estimate with RSL consideration is proposed using a vertical fluctuating velocity scale 〈w ̂ 〉 which facilitates a handy parameterisation for estimating street-level air quality.…

Subjects/Keywords: Turbulent boundary layer; Boundary layer (Meteorology)

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APA (6^th Edition):

何溢翹; Ho, Y. (2017). Wind-tunnel study of turbulent boundary layer over idealised urban roughness with application to urban ventilation problem. (Doctoral Dissertation). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/240673

Chicago Manual of Style (16^th Edition):

何溢翹; Ho, Yat-kiu. “Wind-tunnel study of turbulent boundary layer over idealised urban roughness with application to urban ventilation problem.” 2017. Doctoral Dissertation, University of Hong Kong. Accessed December 08, 2019. http://hdl.handle.net/10722/240673.

MLA Handbook (7^th Edition):

何溢翹; Ho, Yat-kiu. “Wind-tunnel study of turbulent boundary layer over idealised urban roughness with application to urban ventilation problem.” 2017. Web. 08 Dec 2019.

Vancouver:

何溢翹; Ho Y. Wind-tunnel study of turbulent boundary layer over idealised urban roughness with application to urban ventilation problem. [Internet] [Doctoral dissertation]. University of Hong Kong; 2017. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10722/240673.

Council of Science Editors:

何溢翹; Ho Y. Wind-tunnel study of turbulent boundary layer over idealised urban roughness with application to urban ventilation problem. [Doctoral Dissertation]. University of Hong Kong; 2017. Available from: http://hdl.handle.net/10722/240673

Virginia Tech

23. Harper, David Keneda. Boundary Layer Control and Wall-Pressure Fluctuations in a Serpentine Inlet.

Degree: MS, Mechanical Engineering, 2000, Virginia Tech

URL: http://hdl.handle.net/10919/32841

► In this thesis, the benefits of boundary layer control (BLC) in improving aerodynamic performance and engine stability were examined in a compact, serpentine inlet exhibiting… (more)

Subjects/Keywords: Serpentine inlet; wall-pressure fluctuations; Boundary layer control; Separation

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APA (6^th Edition):

Harper, D. K. (2000). Boundary Layer Control and Wall-Pressure Fluctuations in a Serpentine Inlet. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/32841

Chicago Manual of Style (16^th Edition):

Harper, David Keneda. “Boundary Layer Control and Wall-Pressure Fluctuations in a Serpentine Inlet.” 2000. Masters Thesis, Virginia Tech. Accessed December 08, 2019. http://hdl.handle.net/10919/32841.

MLA Handbook (7^th Edition):

Harper, David Keneda. “Boundary Layer Control and Wall-Pressure Fluctuations in a Serpentine Inlet.” 2000. Web. 08 Dec 2019.

Vancouver:

Harper DK. Boundary Layer Control and Wall-Pressure Fluctuations in a Serpentine Inlet. [Internet] [Masters thesis]. Virginia Tech; 2000. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10919/32841.

Council of Science Editors:

Harper DK. Boundary Layer Control and Wall-Pressure Fluctuations in a Serpentine Inlet. [Masters Thesis]. Virginia Tech; 2000. Available from: http://hdl.handle.net/10919/32841

24. Nogueira, Dulce Isabel Meneses. Turbulent boundary layer wall pressure fluctuations with and without pressure gradients .

Degree: 2018, Universidade de Aveiro

URL: http://hdl.handle.net/10773/24851

► Turbulent Boundary Layers (TBL) are a significant source of vibration and noise for different types of structures. These structures may be excited by pressure fluctuations… (more)

▼ Turbulent Boundary Layers (TBL) are a significant source of vibration and noise for different types of structures. These structures may be excited by pressure fluctuations due to the turbulent flow induced by their motions. To reduce the noise radiated from these structures is important to understand how the structure reacts to the TBL excitation. Therefore, it is necessary to study the TBL under different pressure conditions. TBL exhibit random-like fluid motion, so is convenient to describe it in terms of wall pressure spectrums. The work performed during this internship at von Karman Institute for Fluid Dynamics (VKI), was integrated under the TUMULT project (TUrbulent flow noise Modelling for Under- and upper-body Load and Transmission analysis). One of the objective of the internship was the investigation of the TBL under zero, favourable and adverse pressure gradients for two velocities, 15 and 25 m.s-1. For that purpose, experimental techniques, such as, hot wire anemometer and microphone antenna, were combined to generate a database allowing to validate and improve wall pressure models accounting for Reynolds number and pressure gradient effects. These experiments had taken place at the “wind tunnel for aeroacoustics boundary layer including pressure gradient effect” (WAABLIEF). The characterization of the TBL was successfully accomplished using hot wire anemometer, and the wall pressure spectrums for each condition were calculated applying wall pressure models and using a microphone antenna for further validation. The models applied to characterize the wall pressure spectrums were Goody and Rozenberg models. An uncertainty analysis was also performed for hot wire anemometer. The PIV technique was applied in the framework of this internship, besides the objectives of the TUMULT project. In order to get experience about the application of this technique, a parametric study was successfully accomplished to find out the best configuration for the PIV measurements for the research work of the PhD student Gian Luca Gori and the research master student Simão Nóbrega from VKI. Finally, in this report it is also included a literature review about the urban atmospheric boundary layer. This section has the objective of demonstrate the type of application of the concepts and techniques learned during the internship to the field of environmental engineering. Advisors/Committee Members: Borrego, Carlos (advisor), Rodrigues, Vera Augusta Moreira (advisor), Schram, Christophe (advisor), Wyer, Nicolas Van der (advisor).

Subjects/Keywords: Turbulent boundary layer; Adverse and favourable pressure gradients; Wall pressure spectrum; Hot wire anemometer; Microphone antenna; Particle image velocimetry (PIV)

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APA (6^th Edition):

Nogueira, D. I. M. (2018). Turbulent boundary layer wall pressure fluctuations with and without pressure gradients . (Thesis). Universidade de Aveiro. Retrieved from http://hdl.handle.net/10773/24851

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nogueira, Dulce Isabel Meneses. “Turbulent boundary layer wall pressure fluctuations with and without pressure gradients .” 2018. Thesis, Universidade de Aveiro. Accessed December 08, 2019. http://hdl.handle.net/10773/24851.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nogueira, Dulce Isabel Meneses. “Turbulent boundary layer wall pressure fluctuations with and without pressure gradients .” 2018. Web. 08 Dec 2019.

Vancouver:

Nogueira DIM. Turbulent boundary layer wall pressure fluctuations with and without pressure gradients . [Internet] [Thesis]. Universidade de Aveiro; 2018. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10773/24851.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nogueira DIM. Turbulent boundary layer wall pressure fluctuations with and without pressure gradients . [Thesis]. Universidade de Aveiro; 2018. Available from: http://hdl.handle.net/10773/24851

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

25. Kim, Taehoon. Experimental investigation on turbulent flow overlying permeable walls.

Degree: PhD, Theoretical & Applied Mechans, 2019, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/104739

► A turbulent flow overlying a permeable wall can be subdivided into two distinct flow regions separated by a permeable interface. The first is the surface… (more)

▼ A turbulent flow overlying a permeable wall can be subdivided into two distinct flow regions separated by a permeable interface. The first is the surface (or free) flow region, which overlies the interface. The second is the subsurface (or pore) flow region, which occurs within the permeable wall. While the near-wall surface flow can be turbulent, deep within the bed the subsurface flow is often laminar and can be described by Darcy's law (a balance of viscous and pressure forces). Thus, a region must exist between these two extremes where the flow undergoes a transition from inertia-dominated turbulence to viscous-dominated, laminar flow across the permeable interface. This region, typically termed the 'transitional layer,' develops across the permeable interface where non-linear flow interactions between the free flow and the pore flow take place. Accessing this region either experimentally or computationally is extremely challenging, with the latter limited by direct physical of optical access near and within the bed. The goal of this study was to explore the role of wall permeability and surface topography in flow interactions across a permeable interface and the corresponding turbulent boundary layer modifications in the surface flow region. The turbulent flow overlying impermeable and permeable walls with identical surface topography was explored experimentally using the particle-image velocimetry technique coupled with a unique refractive-index matching flow environment, whereby the latter provided full optical access to the flow in the vicinity of and within the permeable interface and the former allowed the acquisition of instantaneous velocity fields in this region with this optical access. Utilizing velocity statistics and conditional averaging, quantitative assessments were made for turbulent boundary layer modifications imposed by permeability and topography as well as the role of these effects in the mutual interplay between the surface and subsurface flows. Surface topography is found to intensify these interactions across the transitional layer, meaning that it enhances mass, momentum and energy transport between these two flow regimes. In addition, it was found that the larger scales of the surface-layer flow modulate the smaller scales near the permeable interface and within the bed itself. This effect was previously identified in canonical turbulent boundary layers (both smooth and rough), but the results presented herein highlight the enhancement of modulation effects owing to permeability. This physical linkage between the surface and subsurface flows across the transitional layer could provide a new framework for modeling such effects based on this unique dynamic connection between the two flow regimes. Advisors/Committee Members: Christensen, Kenneth T. (advisor), Christensen, Kenneth T. (Committee Chair), Pantano-Rubino, Carlos A. (committee member), Best, James L. (committee member), Garcia, Marcelo H. (committee member).

Subjects/Keywords: turbulence; permeable wall; porous media; boundary layer; structural modification; modulation; refractive index matching; particle image velocimetry; PIV

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kim, T. (2019). Experimental investigation on turbulent flow overlying permeable walls. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/104739

Chicago Manual of Style (16^th Edition):

Kim, Taehoon. “Experimental investigation on turbulent flow overlying permeable walls.” 2019. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed December 08, 2019. http://hdl.handle.net/2142/104739.

MLA Handbook (7^th Edition):

Kim, Taehoon. “Experimental investigation on turbulent flow overlying permeable walls.” 2019. Web. 08 Dec 2019.

Vancouver:

Kim T. Experimental investigation on turbulent flow overlying permeable walls. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2019. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/2142/104739.

Council of Science Editors:

Kim T. Experimental investigation on turbulent flow overlying permeable walls. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2019. Available from: http://hdl.handle.net/2142/104739

Michigan State University

26. Hudy, Laurea Michele. Simultaneous wall-pressure array and PIV measurements in a separating/reattaching flow region.

Degree: MS, Department of Mechanical Engineering, 2001, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:30844

Subjects/Keywords: Wall pressure (Aerodynamics); Particle image velocimetry; Turbulent boundary layer

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hudy, L. M. (2001). Simultaneous wall-pressure array and PIV measurements in a separating/reattaching flow region. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:30844

Chicago Manual of Style (16^th Edition):

Hudy, Laurea Michele. “Simultaneous wall-pressure array and PIV measurements in a separating/reattaching flow region.” 2001. Masters Thesis, Michigan State University. Accessed December 08, 2019. http://etd.lib.msu.edu/islandora/object/etd:30844.

MLA Handbook (7^th Edition):

Hudy, Laurea Michele. “Simultaneous wall-pressure array and PIV measurements in a separating/reattaching flow region.” 2001. Web. 08 Dec 2019.

Vancouver:

Hudy LM. Simultaneous wall-pressure array and PIV measurements in a separating/reattaching flow region. [Internet] [Masters thesis]. Michigan State University; 2001. [cited 2019 Dec 08]. Available from: http://etd.lib.msu.edu/islandora/object/etd:30844.

Council of Science Editors:

Hudy LM. Simultaneous wall-pressure array and PIV measurements in a separating/reattaching flow region. [Masters Thesis]. Michigan State University; 2001. Available from: http://etd.lib.msu.edu/islandora/object/etd:30844

Michigan State University

27. Hudy, Laura Michele. Simultaneous wall-pressure and velocity measurements in the flow field downstream of an axisymmetric backward-facing step.

Degree: PhD, Department of Mechanical Engineering, 2005, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:33909

Subjects/Keywords: Wall pressure (Aerodynamics); Particle image velocimetry; Turbulent boundary layer

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hudy, L. M. (2005). Simultaneous wall-pressure and velocity measurements in the flow field downstream of an axisymmetric backward-facing step. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:33909

Chicago Manual of Style (16^th Edition):

Hudy, Laura Michele. “Simultaneous wall-pressure and velocity measurements in the flow field downstream of an axisymmetric backward-facing step.” 2005. Doctoral Dissertation, Michigan State University. Accessed December 08, 2019. http://etd.lib.msu.edu/islandora/object/etd:33909.

MLA Handbook (7^th Edition):

Hudy, Laura Michele. “Simultaneous wall-pressure and velocity measurements in the flow field downstream of an axisymmetric backward-facing step.” 2005. Web. 08 Dec 2019.

Vancouver:

Hudy LM. Simultaneous wall-pressure and velocity measurements in the flow field downstream of an axisymmetric backward-facing step. [Internet] [Doctoral dissertation]. Michigan State University; 2005. [cited 2019 Dec 08]. Available from: http://etd.lib.msu.edu/islandora/object/etd:33909.

Council of Science Editors:

Hudy LM. Simultaneous wall-pressure and velocity measurements in the flow field downstream of an axisymmetric backward-facing step. [Doctoral Dissertation]. Michigan State University; 2005. Available from: http://etd.lib.msu.edu/islandora/object/etd:33909

Virginia Tech

28. Grissom, Dustin Leonard. A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces.

Degree: PhD, Aerospace and Ocean Engineering, 2007, Virginia Tech

URL: http://hdl.handle.net/10919/28336

► The far field acoustics generated by turbulent flow over rough surfaces has been experimentally investigated in an acoustically treated wall jet facility. The facility allows… (more)

▼ The far field acoustics generated by turbulent flow over rough surfaces has been experimentally investigated in an acoustically treated wall jet facility. The facility allows direct measurement of the far field sound from small patches of surface roughness, without contamination from edge or other aerodynamic noise sources. The facility is capable of generating turbulent boundary layer flows with momentum thickness Reynolds numbers between 450 and 1160. The variation of surface conditions tested cover the range from hydrodynamically smooth surfaces through most of the transitional range, with h+ variations from 3 to 85. Single microphone narrow band acoustic spectra, measured in the far field, show sound levels as much as 15 dB above the background from 0.186 m2 roughness patches. The measurements revealed the spectral shape and level variations with flow velocity, boundary layer thickness, and roughness size; providing the first data set large enough to assess the affects of many aerodynamic properties on the acoustic spectra. Increases in the size of grit type roughness produced significant increases in acoustic levels. Patches of hydrodynamically smooth roughness generated measurable acoustic levels, confirming that acoustic scattering is at least one of the physical mechanisms responsible for roughness noise. The shapes of the measured spectra show a strong dependence on the form of the surface roughness. The acoustic spectra generated by periodic two-dimensional surfaces have a much narrower louder peak than that generated by three-dimensional grit type roughness. Measurements also show the orientation of the two-dimensional surface significantly affects the acoustic levels and directivity. The variation of sound levels with flow velocity and roughness size suggests the acoustic field is significantly affected by changes in the near wall flow due to the presence of the roughness. Current models of noise generated by rough surfaces predict the general trends seen in measurements for flows over grit and two-dimensional roughness in the range of 20<h+<50. However, in cases with a low Reynolds number or large grit size, where the roughness is likely to significantly affect the hydrodynamic pressure field, the scattering models did not perform as well. Advisors/Committee Members: Devenport, William J. (committeechair), Glegg, Stewart A. L. (committee member), Johnson, Martin E. (committee member), Burdisso, Ricardo A. (committee member), Simpson, Roger L. (committee member).

Subjects/Keywords: turbulent flow noise; wall jet; rough wall boundary layer noise; acoustic scattering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Grissom, D. L. (2007). A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/28336

Chicago Manual of Style (16^th Edition):

Grissom, Dustin Leonard. “A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces.” 2007. Doctoral Dissertation, Virginia Tech. Accessed December 08, 2019. http://hdl.handle.net/10919/28336.

MLA Handbook (7^th Edition):

Grissom, Dustin Leonard. “A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces.” 2007. Web. 08 Dec 2019.

Vancouver:

Grissom DL. A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces. [Internet] [Doctoral dissertation]. Virginia Tech; 2007. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10919/28336.

Council of Science Editors:

Grissom DL. A Study of Sound Generated by a Turbulent Wall Jet Flow Over Rough Surfaces. [Doctoral Dissertation]. Virginia Tech; 2007. Available from: http://hdl.handle.net/10919/28336

University of North Texas

29. Yu, Guowang. Cold-formed Steel Framed Shear Wall Sheathed with Corrugated Sheet Steel.

Degree: 2013, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc271921/

► Incombustibility is one important advantage of the sheet steel sheathed shear wall over wood panel sheathed shear wall. Compared to shear wall sheathed with plywood… (more)

Subjects/Keywords: Cold-formed; steel; shear wall

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APA (6^th Edition):

Yu, G. (2013). Cold-formed Steel Framed Shear Wall Sheathed with Corrugated Sheet Steel. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc271921/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yu, Guowang. “Cold-formed Steel Framed Shear Wall Sheathed with Corrugated Sheet Steel.” 2013. Thesis, University of North Texas. Accessed December 08, 2019. https://digital.library.unt.edu/ark:/67531/metadc271921/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yu, Guowang. “Cold-formed Steel Framed Shear Wall Sheathed with Corrugated Sheet Steel.” 2013. Web. 08 Dec 2019.

Vancouver:

Yu G. Cold-formed Steel Framed Shear Wall Sheathed with Corrugated Sheet Steel. [Internet] [Thesis]. University of North Texas; 2013. [cited 2019 Dec 08]. Available from: https://digital.library.unt.edu/ark:/67531/metadc271921/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yu G. Cold-formed Steel Framed Shear Wall Sheathed with Corrugated Sheet Steel. [Thesis]. University of North Texas; 2013. Available from: https://digital.library.unt.edu/ark:/67531/metadc271921/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

30. Akinlade, Olajide Ganiyu. Effects of surface roughness on the flow characteristics in a turbulent boundary layer.

Degree: 2005, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-01032006-225406

► The present understanding of the structure and dynamics of turbulent boundary layers on aerodynamically smooth walls has been clarified over the last decade or so.… (more)

▼ The present understanding of the structure and dynamics of turbulent boundary layers on aerodynamically smooth walls has been clarified over the last decade or so. However, the dynamics of turbulent boundary layers over rough surfaces is much less well known. Nevertheless, there are many industrial and environmental flow applications that require understanding of the mean velocity and turbulence in the immediate vicinity of the roughness elements. This thesis reports the effects of surface roughness on the flow characteristics in a turbulent boundary layer. Both experimental and numerical investigations are used in the present study. For the experimental study, comprehensive data sets are obtained for two-dimensional zero pressure-gradient turbulent boundary layers on a smooth surface and ten different rough surfaces created from sand paper, perforated sheet, and woven wire mesh. The physical size and geometry of the roughness elements and freestream velocity were chosen to encompass both transitionally rough and fully rough flow regimes. Three different probes, namely, Pitot probe, single hot-wire, and cross hot-film, were used to measure the velocity fields in the turbulent boundary layer. A Pitot probe was used to measure the streamwise mean velocity, while the single hot-wire and cross hot-film probes were used to measure the fluctuating velocity components across the boundary layer. The flow Reynolds number based on momentum thickness, , ranged from 3730 to 13,550. The data reported include mean velocity, streamwise and wall-normal turbulence intensities, Reynolds shear stress, triple correlations, as well as skewness and flatness factors. Different scaling parameters were used to interpret and assess both the smooth- and rough-wall data at different Reynolds numbers, for approximately the same freestream velocity. The appropriateness of the logarithmic law and power law proposed by George and Castillo (1997) to describe the mean velocity in the overlap region was also investigated. The present results were interpreted within the context of the Townsend’s wall similarity hypothesis. Based on the mean velocity data, a novel correlation that relates the skin friction to the ratio of the displacement and boundary layer thicknesses, which is valid for both smooth- and rough-wall flows, was proposed. In addition, it was also found that the application of a “mixed outer scale” caused the velocity profile in the outer region to collapse onto the same curve, irrespective of Reynolds numbers and roughness conditions. The present results showed that there is a common region within the overlap region of the mean velocity profile where both the log law and power law are indistinguishable, irrespective of the surface conditions. For the power law formulation, functional relationships between the roughness shift, and the power law coefficient and exponent were developed for the transitionally rough flows. The present results also suggested that the effect of surface roughness on the turbulence field depends to some degree… Advisors/Committee Members: Bergstrom, Donald J., Sumner, Robert J., Sumner, David, Naughton, Jonathan, Fotouhi, Reza, Bugg, James D..

Subjects/Keywords: Two-Layer Model; Wall Function Formulation; Reynolds Stress Components; Rough Wall; Turbulent Boundary Layer; Skin Friction Drag

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Akinlade, O. G. (2005). Effects of surface roughness on the flow characteristics in a turbulent boundary layer. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-01032006-225406

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Akinlade, Olajide Ganiyu. “Effects of surface roughness on the flow characteristics in a turbulent boundary layer.” 2005. Thesis, University of Saskatchewan. Accessed December 08, 2019. http://hdl.handle.net/10388/etd-01032006-225406.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Akinlade, Olajide Ganiyu. “Effects of surface roughness on the flow characteristics in a turbulent boundary layer.” 2005. Web. 08 Dec 2019.

Vancouver:

Akinlade OG. Effects of surface roughness on the flow characteristics in a turbulent boundary layer. [Internet] [Thesis]. University of Saskatchewan; 2005. [cited 2019 Dec 08]. Available from: http://hdl.handle.net/10388/etd-01032006-225406.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Akinlade OG. Effects of surface roughness on the flow characteristics in a turbulent boundary layer. [Thesis]. University of Saskatchewan; 2005. Available from: http://hdl.handle.net/10388/etd-01032006-225406

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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