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Prediction of fluid flow and acoustic field of a supersonic jet using vorticity confinement

Sadri, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1121/1.5055215
  3. Publisher: Acoustical Society of America , 2018
  4. Abstract:
  5. In this study, the numerical simulation of the fluid flow and acoustic field of a supersonic jet is performed by using high-order discretization and the vorticity confinement (VC) method on coarse grids. The three-dimensional Navier-Stokes equations are considered in the generalized curvilinear coordinate system and the high-order compact finite-difference scheme is applied for the space discretization, and the time integration is performed by the fourth-order Runge-Kutta scheme. A low-pass high-order filter is applied to stabilize the numerical solution. The non-reflecting boundary conditions are adopted for all the free boundaries, and the Kirchhoff surface integration is utilized to obtain the far-field sound pressure levels in a number of observer locations. Comparisons of the jet mean flow and jet aeroacoustics results with the other numerical and experimental data at similar flow conditions are made and show a reasonable agreement. The study shows that the proposed solution methodology based on the high-order compact finite-difference scheme in conjunction with the VC method can reasonably predict the near-field flow and the far-field noise of high Reynolds number jets with a fairly coarser grid than that used in the large eddy simulations and, thus, the computational cost can be significantly decreased. © 2018 Acoustical Society of America
  6. Keywords:
  7. Acoustic fields ; Aeroacoustics ; Computational fluid dynamics ; Finite difference method ; Large eddy simulation ; Numerical methods ; Reynolds number ; Runge Kutta methods ; Supersonic aerodynamics ; Vorticity ; Far-field sound pressure ; Fourth-order runge-kutta ; Generalized curvilinear coordinates ; High-order compact finite difference schemes ; Non reflecting boundary condition ; Space discretizations ; Three-dimensional Navier-Stokes equations ; Vorticity confinement ; Navier Stokes equations
  8. Source: Journal of the Acoustical Society of America ; Volume 144, Issue 3 , 2018 , Pages 1521-1527 ; 00014966 (ISSN)
  9. URL: https://asa.scitation.org/doi/10.1121/1.5055215