Numerical Investigation of a Jet Flow with a Hatch and an Opening PDF Download
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Author: Mrinal V.. Nagrecha
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 68
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Book Description
The goal of this project was to establish a datum for acoustics generated in an exhaust flow from a jet pipe, due to the presence of an opening with a hatch at an angle, by using the Computational Fluid Dynamics (CFD) tool FLUENT. After validating the geometry using a supersonic case employing a fully expanded jet, a secondary supersonic test case was produced to compare results with the former using a Detached Eddy Simulation with Spalart-Allmaras (DES-SA) scheme. Two subsonic cases using the same boundary conditions (BCs) were then computed using a Large Eddy Simulation (LES) turbulence model in order to solve for flow-field data and Sound Pressure Level (SPL) of the given geometry. Focus was given to the region around the opening, and the computed pressure data was stored in three regions: above the opening, under the opening, and past the opening. Pressure contours in the region around the hatch were captured well and shown to be consistent between the two geometries employed for the domain of solution. Results concluded that using the smaller domain of solution maintained resolution quality while decreasing overall computation time tremendously.
Author: Mrinal V.. Nagrecha
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 68
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Book Description
The goal of this project was to establish a datum for acoustics generated in an exhaust flow from a jet pipe, due to the presence of an opening with a hatch at an angle, by using the Computational Fluid Dynamics (CFD) tool FLUENT. After validating the geometry using a supersonic case employing a fully expanded jet, a secondary supersonic test case was produced to compare results with the former using a Detached Eddy Simulation with Spalart-Allmaras (DES-SA) scheme. Two subsonic cases using the same boundary conditions (BCs) were then computed using a Large Eddy Simulation (LES) turbulence model in order to solve for flow-field data and Sound Pressure Level (SPL) of the given geometry. Focus was given to the region around the opening, and the computed pressure data was stored in three regions: above the opening, under the opening, and past the opening. Pressure contours in the region around the hatch were captured well and shown to be consistent between the two geometries employed for the domain of solution. Results concluded that using the smaller domain of solution maintained resolution quality while decreasing overall computation time tremendously.
Author: Harold E. Adkins
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 360
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Author: Yogen Utturkar
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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Author: Touraj Sahely
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 154
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Author: 夏麗萍
Publisher: Open Dissertation Press
ISBN: 9781361192900
Category :
Languages : en
Pages :
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This dissertation, "An Experimental and Numerical Investigation of a Turbulent Round Jet Issuing Into an Unsteady Crossflow" by 夏麗萍, Liping, Xia, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123789 Subjects: Unsteady flow (Aerodynamics) Jets - Fluid dynamics
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 462
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![An Experimental and Numerical Investigation of Three-dimensional Jet Flows from Sharp-edged Orifices [microform] PDF](https://books.google.com/books/content/images/frontcover/xCUUvwEACAAJ?fife=w80-h100)
Author: Rainer Rudolf Schwab
Publisher: National Library of Canada
ISBN: 9780315423091
Category :
Languages : en
Pages :
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Author: Junxiao Wu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: J. Zhu
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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A numerical investigation is reported of turbulent incompressible jets confined in two ducts, one cylindrical and the other conical with a 5 degree divergence. In each case, three Craya-Curtet numbers are considered which correspond, respectively, to flow situations with no moderate and strong recirculation. Turbulence closure is achieved by using the k-epsilon model and a recently proposed realizable Reynolds stress algebraic equation model that relates the Reynolds stresses explicitly to the quadratic terms of the mean velocity gradients and ensures the positiveness of each component of the turbulent kinetic energy. Calculations are carried out with a finite-volume procedure using boundary-fitted curvilinear coordinates. A second-order accurate, bounded convection scheme and sufficiently fine grids are used to prevent the solutions from being contaminated by numerical diffusion. The calculated results are compared extensively with the available experimental data. It is shown that the numerical methods presented are capable of capturing the essential flow features observed in the experiments and that the realizable Reynolds stress algebraic equation model performs much better than the k-epsilon model for this class of flows of great practical importance.
Author: Rebecca Lynne Zarba
Publisher:
ISBN:
Category :
Languages : en
Pages : 406
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