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You searched for subject:(Curvilinear grid). Showing records 1 – 3 of 3 total matches.

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1. Carrion Aretxabala, B.I. (author). Morphological impact of the Sinterklaas storm at Het Zwin: Numerical modelling with XBeach.

Degree: 2015, Delft University of Technology

A very large storm hit the coasts of The Netherlands-and most of north-west Europe-during the evening of the 5th of December 2013. The Sinterklaas storm, as it was later known, induced extremely high water levels and substantial dune erosion all along the Dutch coastline. In this thesis the morphological impact of the Sinterklaas storm at one particular location-Het Zwin-will be analysed from measurements and simulated with the process-based model XBeach. Het Zwin is a relatively small natural reserve shared between The Netherlands and Belgium. It is a brackish reservoir dominated by the tide, composed mainly by tidal flats protected from the sea by beach dunes and separated from the hinterland by clay dikes. Actually it is hard to classify the Zwin; it is not really an estuary, given its small dimensions, nor a tidal inlet since no lagoon is present behind the dunes. Probably it is best defined by the Dutch word "slufter". Two different storm regimes were observed at Het Zwin during the Sinterklaas storm: dune erosion (collision), and storm overwash, the latter confined at a precise location where the Dutch dunes were lower and narrower. The storm impact was deduced from lidar measurements of the terrain elevation prior and after the event, and the hydrodynamic conditions of the storm were obtained from wave buoys and tide gauges deployed and maintained by both countries. These data were used as inputs for a numerical hind-cast of the storm impact. Calibration of the model considered sensitive parameters that were either meaningful physical inputs, such as the bottom friction, or numerical proxies for physical processes, such as the critical slope for avalanching. As suggested in previous studies, the collision regime was found to be dependent on the onshore transport induced by short-waves, whereas the overwash regime and the washover fan were determined by the bottom friction at the higher parts of the dunes. The best fit was obtained with parameters facua = 0.10, and C = 25, respectively. Additionally, the critical slope for avalanching which produced the best fit, both in sand loss and profile shape, was found to be wetslp = 0.20, slightly lower than the recommended default value of 0.30. However, it is argued that the actual value to be used in other studies might be a function of the grid size, since it determines the ability of the model to assess the terrain slope. Morphodynamic numerical modelling is normally a costly task. For this particular site of study three factors induced very large simulation times, which rendered the modelling with XBeach unworkable: 1. A rather large domain is needed to incorporate the refraction of the wave data. 2. A very fine grid is required in order to reproduce the flooding and drying processes of the overwash and (in a lesser way) the avalanching of the dunes' face. 3. The duration of the storm, of a few days, is rather large compared with the physical events being modelled, which have a time scale of a fraction of seconds. A central issue in this thesis is the optimization… Advisors/Committee Members: Stive, M.J.F. (mentor), Reniers, A.J.H.M. (mentor), Van Rooijen, A.A. (mentor), Boers, M. (mentor), De Vet, P.L.M. (mentor).

Subjects/Keywords: storm impact; dune erosion; overwash; curvilinear grid; offline coupling

…x28;upper panels) versus curvilinear (lower panels) grid approach setup… …mouth, respectively. . . . . . . . . . . . . . . . . . . . . 4.3 Curvilinear grid approach… …velocity in black and gray, respectively. . . . . . . . 4.4 Curvilinear grid approach… …shows the simulated time series at those points for both rectangular and curvilinear grids… …rectangular (left panel) and curvilinear (right panel) grids. Warm colors… 

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APA (6th Edition):

Carrion Aretxabala, B. I. (. (2015). Morphological impact of the Sinterklaas storm at Het Zwin: Numerical modelling with XBeach. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2be5eb0f-e34a-4989-820e-f39d9a3b0bfc

Chicago Manual of Style (16th Edition):

Carrion Aretxabala, B I (author). “Morphological impact of the Sinterklaas storm at Het Zwin: Numerical modelling with XBeach.” 2015. Masters Thesis, Delft University of Technology. Accessed November 27, 2020. http://resolver.tudelft.nl/uuid:2be5eb0f-e34a-4989-820e-f39d9a3b0bfc.

MLA Handbook (7th Edition):

Carrion Aretxabala, B I (author). “Morphological impact of the Sinterklaas storm at Het Zwin: Numerical modelling with XBeach.” 2015. Web. 27 Nov 2020.

Vancouver:

Carrion Aretxabala BI(. Morphological impact of the Sinterklaas storm at Het Zwin: Numerical modelling with XBeach. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2020 Nov 27]. Available from: http://resolver.tudelft.nl/uuid:2be5eb0f-e34a-4989-820e-f39d9a3b0bfc.

Council of Science Editors:

Carrion Aretxabala BI(. Morphological impact of the Sinterklaas storm at Het Zwin: Numerical modelling with XBeach. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:2be5eb0f-e34a-4989-820e-f39d9a3b0bfc

2. Bahaidarah, Haitham M. S. A numerical study of heat and momentum transfer over a bank of flat tubes.

Degree: PhD, Mechanical Engineering, 2005, Texas A&M University

The present study considers steady laminar two-dimensional incompressible flow over both in-line and staggered flat tube bundles used in heat exchanger applications. The effects of various independent parameters, such as Reynolds number (Re), Prandtl number (Pr), length ratio (L/Da), and height ratio (H/Da), on the pressure drop and heat transfer were studied. A finite volume based FORTRAN code was developed to solve the governing equations. The scalar and velocity variables were stored at staggered grid locations. Scalar variables (pressure and temperature) and all thermophysical properties were stored at the main grid location and velocities were stored at the control volume faces. The solution to a one-dimensional convection diffusion equation was represented by the power law. The locations of grid points were generated by the algebraic grid generation technique. The curvilinear velocity and pressure fields were linked by the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) algorithm. The line-by-line method, which is a combination of the Tri-Diagonal Matrix Algorithm (TDMA) and the Gauss-Seidel procedure, was used to solve the resulting set of discretization equations. The result of the study established that the flow is observed to attain a periodically fully developed profile downstream of the fourth module. The strength increases and the size of the recirculation gets larger as the Reynolds number increases. As the height ratio increases, the strength and size of the recirculation decreases because the flow has enough space to expand through the tube passages. The increase in length ratio does not significantly impact the strength and size of the recirculation. The non-dimesionalized pressure drop monotonically decreased with an increase in the Reynolds number. In general, the module average Nusselt number increases with an increase in the Reynolds number. The results at Pr = 7.0 indicate a significant increase in the computed module average Nusselt number when compared to those for Pr = 0.7. The overall performance of in-line configuration for lower height ratio (H/Da = 2) and higher length ratio (L/Da = 6) is preferable since it provides higher heat transfer rate for all Reynolds numbers except for the lowest Re value of 25. As expected the staggered configurations perform better than the in-line configuration from the heat transfer point of view. Advisors/Committee Members: Chen, H. C. (advisor), Anand, Nagamangala K. (advisor), Han, J. C. (committee member), Kihm, K. D. (committee member).

Subjects/Keywords: Flat tube bundles; Finite volume method; Heat exchanger applications; Staggered grid; Curvilinear velocity

…viii CHAPTER 2.3 Page 28 DEPENDENT VARIABLES AND GRID CONFIGURATION …... 29 3.1… …3.1.2 Covariant and Contravariant Unit Vector ... Curvilinear Velocity Components and… …Velocity Projections ... Grid Configuration .. 3.4.1 Structured… …and Unstructured Grid ... … 3.4.2 Staggered and Non-Staggered Grid… …104 6.1 6.2 6.3 6.4 6.5 VII Page Geometry Configuration ......... Grid… 

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

APA (6th Edition):

Bahaidarah, H. M. S. (2005). A numerical study of heat and momentum transfer over a bank of flat tubes. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/2782

Chicago Manual of Style (16th Edition):

Bahaidarah, Haitham M S. “A numerical study of heat and momentum transfer over a bank of flat tubes.” 2005. Doctoral Dissertation, Texas A&M University. Accessed November 27, 2020. http://hdl.handle.net/1969.1/2782.

MLA Handbook (7th Edition):

Bahaidarah, Haitham M S. “A numerical study of heat and momentum transfer over a bank of flat tubes.” 2005. Web. 27 Nov 2020.

Vancouver:

Bahaidarah HMS. A numerical study of heat and momentum transfer over a bank of flat tubes. [Internet] [Doctoral dissertation]. Texas A&M University; 2005. [cited 2020 Nov 27]. Available from: http://hdl.handle.net/1969.1/2782.

Council of Science Editors:

Bahaidarah HMS. A numerical study of heat and momentum transfer over a bank of flat tubes. [Doctoral Dissertation]. Texas A&M University; 2005. Available from: http://hdl.handle.net/1969.1/2782


University of Florida

3. Reed, Christopher William, 1960-. A self-adaptive computational method for transonic turbulent projectile aerodynamics.

Degree: 1987, University of Florida

Subjects/Keywords: Approximation; Coordinate systems; Geometric lines; Grid generation; Heating; Mathematical variables; Orthogonality; Projectiles; Transonic flow; TVD schemes; Aerodynamics, Transonic; Curvilinear coordinates; Engineering Sciences thesis Ph. D; Fluid dynamics; Numerical grid generation (Numerical analysis); Projectiles  – Aerodynamics

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

APA (6th Edition):

Reed, Christopher William, 1. (1987). A self-adaptive computational method for transonic turbulent projectile aerodynamics. (Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/AA00025703

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

Chicago Manual of Style (16th Edition):

Reed, Christopher William, 1960-. “A self-adaptive computational method for transonic turbulent projectile aerodynamics.” 1987. Thesis, University of Florida. Accessed November 27, 2020. https://ufdc.ufl.edu/AA00025703.

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

MLA Handbook (7th Edition):

Reed, Christopher William, 1960-. “A self-adaptive computational method for transonic turbulent projectile aerodynamics.” 1987. Web. 27 Nov 2020.

Vancouver:

Reed, Christopher William 1. A self-adaptive computational method for transonic turbulent projectile aerodynamics. [Internet] [Thesis]. University of Florida; 1987. [cited 2020 Nov 27]. Available from: https://ufdc.ufl.edu/AA00025703.

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

Council of Science Editors:

Reed, Christopher William 1. A self-adaptive computational method for transonic turbulent projectile aerodynamics. [Thesis]. University of Florida; 1987. Available from: https://ufdc.ufl.edu/AA00025703

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

.