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Numerical Simulation of 2D Compressible Mixing Layer Flow using Vorticity Confinement Method

Hashemi Nasab, Hossein | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58112 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Hejranfar, Kazem
  7. Abstract:
  8. The main objective of this study is to evaluate the accuracy and performance of the vorticity confinement (VC) method implemented in a second-order finite volume flow solver for solving two-dimensional compressible mixing layer flows. The spatial discretization of the system of governing equations is performed by a second-order central difference finite volume method and a fourth-order Runge-Kutta method is used for the time integration. To have a stable solution, the second- and fourth-order numerical dissipation terms are applied. At first, two problems, namely, the advection of an isentropic vortex and the shock-vortex interaction are numerically solved and the effects of the confinement and dissipation coefficients are studied on the accuracy of the solution algorithm for reasonably preserving the vortical structures on relatively coarse grids. Then, a high Reynolds number mixing layer is numerically simulated to investigate the capability of the VC method in predicting vortical flows. The calculations are performed using different values of confinement coefficient and the obtained results are compared with those of available large eddy simulation (LES). A sensitivity study is also performed to examine the effect of the numerical parameters involved in the solution algorithm. It is indicated that the second-order finite volume method in conjunction with the vorticity confinement method is capable of reasonably preserving the vortices in the flowfield on coarse grids and the computational cost becomes lower than that of the LES
  9. Keywords:
  10. Vorticity Confinement Method ; Finite Volume Method ; Compressible Flow ; Large Eddy Simulation (LES) ; Compressible Mixing Layer Flow ; Flow Simulation

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