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

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EPFL

1. Schoofs, Philippe Jean. Monte Carlo Modeling of Crystal Channeling at High Energies.

Degree: 2014, EPFL

Charged particles entering a crystal close to some preferred direction can be trapped in the electromagnetic potential well existing between consecutive planes or strings of atoms. This channeling effect can be used to extract beam particles if the crystal is bent beforehand. Crystal channeling is becoming a reliable and efficient technique for collimating beams and removing halo particles. At the European Organization for Nuclear Research (CERN), the installation of silicon crystals in the Large Hadron Collider (LHC) is under scrutiny by the UA9 collaboration with the goal of investigating if they are a viable option for the collimation system upgrade. This thesis describes a new Monte Carlo model of planar channeling which has been developed from scratch in order to be implemented in the FLUKA code simulating particle transport and interactions. Crystal channels are described through the concept of continuous potential taking into account thermal motion of the lattice atoms and using Moliere screening function. The energy of the particle transverse motion determines whether or not it is trapped between the crystal planes while single Coulomb scattering on lattice atoms can lead to dechanneling. The volume capture and reflection applying to quasi-channeled particles are also modeled. Analogously to dechanneling, single scattering is used to determine the occurrence of volume capture. The parameters of the crystals, such as torsion or miscut, are described as well. For channeled particles, the suppression of electromagnetic and nuclear collisions is implemented. It is stronger for particles oscillating close to the center of the channel and is crucial for a correct evaluation of the rate of dechanneling without having recourse to the use of a macroscopic dechanneling length. The UA9-H8 experiment conducted at CERN aims at investigating new crystal physics as well as characterizing crystals that can be of interest in view of the implementation of crystal collimation at CERN, including in the LHC. This experiment uses silicon strip detectors situated on both sides of the crystal. Putting together upstream and downstream tracks in coincidence and matching at an identical fitted location on the crystal, it yields information about the deflections given to the beam population. Several runs from the UA9-H8 experiment are analyzed and compared to the model results. Channeling and dechanneling rates, as well as angular distributions at crystal exit are shown to be in a very encouraging agreement both for strip and quasi-mosaic crystals. Advisors/Committee Members: Rivkin, Leonid, Cerutti, Francesco.

Subjects/Keywords: crystal; channeling; Monte Carlo; Fluka; volume reflection; volume capture; Molière potential; crystal-assisted collimation

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

APA (6th Edition):

Schoofs, P. J. (2014). Monte Carlo Modeling of Crystal Channeling at High Energies. (Thesis). EPFL. Retrieved from http://infoscience.epfl.ch/record/197677

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):

Schoofs, Philippe Jean. “Monte Carlo Modeling of Crystal Channeling at High Energies.” 2014. Thesis, EPFL. Accessed December 07, 2019. http://infoscience.epfl.ch/record/197677.

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

MLA Handbook (7th Edition):

Schoofs, Philippe Jean. “Monte Carlo Modeling of Crystal Channeling at High Energies.” 2014. Web. 07 Dec 2019.

Vancouver:

Schoofs PJ. Monte Carlo Modeling of Crystal Channeling at High Energies. [Internet] [Thesis]. EPFL; 2014. [cited 2019 Dec 07]. Available from: http://infoscience.epfl.ch/record/197677.

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

Council of Science Editors:

Schoofs PJ. Monte Carlo Modeling of Crystal Channeling at High Energies. [Thesis]. EPFL; 2014. Available from: http://infoscience.epfl.ch/record/197677

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

2. Lamouroux, Raphaël. Méthodes compactes d’ordre élevé pour les écoulements présentant des discontinuités : High-order compact schemes for discontinuous flow field simulation.

Degree: Docteur es, Dynamique des fluides, 2016, Toulouse, ISAE

Dans le cadre du développement récent des schémas numériques compacts d’ordre élevé, tels que la méthode de Galerkin discontinu (discontinuous Galerkin) ou la méthode des différences spectrales (spectral differences), nous nous intéressons aux difficultés liées à l’utilisation de ces méthodes lors de la simulation de solutions discontinues.L’utilisation par ces schémas numériques d’une représentation polynomiale des champs les prédisposent à fournir des solutions fortement oscillantes aux abords des discontinuités. Ces oscillations pouvant aller jusqu’à l’arrêt du processus de simulation, l’utilisation d’un dispositif numérique de détection et de contrôle de ces oscillations est alors un prérequis nécessaire au bon déroulement du calcul. Les processus de limitation les plus courants tels que les algorithmes WENO ou l’utilisation d’une viscosité artificielle ont d’ores et déjà été adaptés aux différentes méthodes compactes d’ordres élevés et ont permis d’appliquer ces méthodes à la classe des écoulements compressibles. Les différences entre les stencils utilisés par ces processus de limitation et les schémas numériques compacts peuvent néanmoins être une source importante de perte de performances. Dans cette thèse nous détaillons les concepts et le cheminement permettant d’aboutir à la définition d’un processus de limitation compact adapté à la description polynomiale des champs. Suite à une étude de configurations monodimensionnels, différentes projections polynomiales sont introduites et permettent la construction d’un processus de limitation préservant l’ordre élevé. Nous présentons ensuite l’extension de cette méthodologie à la simulation d’écoulements compressibles bidimensionnels et tridimensionnels. Nous avons en effet développé les schémas de discrétisation des différences spectrales dans un code CFD non structuré, massivement parallèle et basé historiquement sur une méthodologie volumes finis. Nous présentons en particulier différents résultats obtenus lors de la simulation de l’interaction entre une onde de choc et une couche limite turbulente.

Following the recent development of high order compact schemes such as the discontinuous Galerkin or the spectraldifferences, this thesis investigates the issues encountered with the simulation of discontinuous flows. High order compactschemes use polynomial representations which tends to introduce spurious oscillations around discontinuities that can lead to computational failure. To prevent the emergence of these numerical issues, it is necessary to improve the schemewith an additional procedure that can detect and control its behaviour in the neighbourhood of the discontinuities,usually referred to as a limiting procedure or a limiter. Most usual limiters include either the WENO procedure, TVB schemes or the use of an artificial viscosity. All of these solutions have already been adapted to high order compact schemes but none of these techniques takes a real advantage of the richness offered by the polynomial structure. What’s more, the original compactness of…

Advisors/Committee Members: Joly, Laurent (thesis director), Gressier, Jérémie (thesis director).

Subjects/Keywords: Ordre élevé; Schéma compact; Volumes finis; Écoulement compressible; Capture de choc; High-Order schemes; Compact schemes; Finite volume; Compressible flows; Shock fitting; 532

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

APA (6th Edition):

Lamouroux, R. (2016). Méthodes compactes d’ordre élevé pour les écoulements présentant des discontinuités : High-order compact schemes for discontinuous flow field simulation. (Doctoral Dissertation). Toulouse, ISAE. Retrieved from http://www.theses.fr/2016ESAE0035

Chicago Manual of Style (16th Edition):

Lamouroux, Raphaël. “Méthodes compactes d’ordre élevé pour les écoulements présentant des discontinuités : High-order compact schemes for discontinuous flow field simulation.” 2016. Doctoral Dissertation, Toulouse, ISAE. Accessed December 07, 2019. http://www.theses.fr/2016ESAE0035.

MLA Handbook (7th Edition):

Lamouroux, Raphaël. “Méthodes compactes d’ordre élevé pour les écoulements présentant des discontinuités : High-order compact schemes for discontinuous flow field simulation.” 2016. Web. 07 Dec 2019.

Vancouver:

Lamouroux R. Méthodes compactes d’ordre élevé pour les écoulements présentant des discontinuités : High-order compact schemes for discontinuous flow field simulation. [Internet] [Doctoral dissertation]. Toulouse, ISAE; 2016. [cited 2019 Dec 07]. Available from: http://www.theses.fr/2016ESAE0035.

Council of Science Editors:

Lamouroux R. Méthodes compactes d’ordre élevé pour les écoulements présentant des discontinuités : High-order compact schemes for discontinuous flow field simulation. [Doctoral Dissertation]. Toulouse, ISAE; 2016. Available from: http://www.theses.fr/2016ESAE0035

3. Valbuena Olivares, Ernesto. Analytical Estimation of CO2 Storage Capacity in Depleted Oil and Gas Reservoirs Based on Thermodynamic State Functions.

Degree: 2012, Texas A&M University

Numerical simulation has been used, as common practice, to estimate the CO2 storage capacity of depleted reservoirs. However, this method is time consuming, expensive and requires detailed input data. This investigation proposes an analytical method to estimate the ultimate CO2 storage in depleted oil and gas reservoirs by implementing a volume constrained thermodynamic equation of state (EOS) using the reservoir?s average pressure and fluid composition. This method was implemented in an algorithm which allows fast and accurate estimations of final storage, which can be used to select target storage reservoirs, and design the injection scheme and surface facilities. Impurities such as nitrogen and carbon monoxide, usually contained in power plant flue gases, are considered in the injection stream and can be handled correctly in the proposed algorithm by using their thermodynamic properties into the EOS. Results from analytical method presented excellent agreement with those from reservoir simulation. Ultimate CO2 storage capacity was predicted with an average difference of 1.3%, molar basis, between analytical and numerical methods; average oil, gas, and water saturations were also matched. Additionally, the analytical algorithm performed several orders of magnitude faster than numerical simulation, with an average of 5 seconds per run. Advisors/Committee Members: Barrufet, Maria A. (advisor), Falcone, Gioia (committee member), Blasingame, Thomas A. (committee member).

Subjects/Keywords: CO2 storage; carbon capture and sequestration; compositional fluids phase behavior; equation of state; partial molar volume; reservoir simulation

…1 fv HCPV vapor fraction hydrocarbon pore volume from rock-water compressibility, ft3 or… …capillary pressure, psi pref reference pressure, psia PV pore volume, ft3 or bbl R gas… …temperature, °R ([°R] = [°F] + 459.67) V total volume, ft3 molar… …volume, ft3/lb-mol ̅ partial molar volume of component i (see derivation on Appendix A… …x29;, ft3/lb-mol ̅ generalized partial molar volume of pseudo component x; where x could… 

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

APA (6th Edition):

Valbuena Olivares, E. (2012). Analytical Estimation of CO2 Storage Capacity in Depleted Oil and Gas Reservoirs Based on Thermodynamic State Functions. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10221

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):

Valbuena Olivares, Ernesto. “Analytical Estimation of CO2 Storage Capacity in Depleted Oil and Gas Reservoirs Based on Thermodynamic State Functions.” 2012. Thesis, Texas A&M University. Accessed December 07, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10221.

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

MLA Handbook (7th Edition):

Valbuena Olivares, Ernesto. “Analytical Estimation of CO2 Storage Capacity in Depleted Oil and Gas Reservoirs Based on Thermodynamic State Functions.” 2012. Web. 07 Dec 2019.

Vancouver:

Valbuena Olivares E. Analytical Estimation of CO2 Storage Capacity in Depleted Oil and Gas Reservoirs Based on Thermodynamic State Functions. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Dec 07]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10221.

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

Council of Science Editors:

Valbuena Olivares E. Analytical Estimation of CO2 Storage Capacity in Depleted Oil and Gas Reservoirs Based on Thermodynamic State Functions. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10221

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

.