Effect of Dissipative Terms on the Quality of Euler Flow Solutions

سال انتشار: 1387
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 2,278

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شناسه ملی سند علمی:

CFD11_117

تاریخ نمایه سازی: 12 مرداد 1387

چکیده مقاله:

The Euler equations are a set of non-dissipative hyperbolic conservation laws that can become unstable near regions of severe pressure variation. To prevent oscillations near shockwaves, these equations require artificial dissipation terms to be added to the discretized equations. A combination of first-order and third-order dissipative terms control the stability of the flow solutions. The assigned magnitude of these dissipative terms can have a direct effect on the quality of the flow solution. To examine these effects, transonic solution of the Euler equations for a flow passed a circular cylinder has been investigated. Triangular unstructured grids were employed to discretize the computational domain. Unsteady Euler equations are then marched through time to reach a steady solution using a modified Rung-Kutta scheme. Optimal values of the dissipative terms were investigated for several flow conditions. For example, at a free stream Mach number of 0.45 strong shock waves were captured on the cylinder by using values of 0.25 and 0.0039 for the first-order and third-order dissipative terms. In addition to the shock capturing effect, it has been shown that smooth pressure coefficients can be obtained with the proper values for the dissipative terms.

نویسندگان

Seyed Saied Bahrainian

Assistant Professor Department of Mechanical Engineering Shahid Chamran University, Ahvaz, Iran

Alireza Daneh Dezfuli

MSc Student Department of Mechanical Engineering Shahid Chamran University, Ahvaz, Iran

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  • MacCormak, R. W., and Baldwin, B. S., ،A Numerical Method ...
  • Hirsch, C., ،Numerical Computation of Internal and External Flows?, Vol. ...
  • Finite Difference Simulation of Flow about Two-D imensional Geometries", AIAA ...
  • Jameson, A., Schmidt, W., and Turkel, E., ،Numerical Simulation of ...
  • Jameson, A., ،Transonic Aerofoil Calculations Using The Euler Equations?, In ...
  • Jameson, A., Baker, T. J., and Weatherill, N. P., «Calculation ...
  • Jameson, A., ،*Solution of the Euler Equations for Two Dimensional ...
  • Jameson, A., and Mavriplis, D., «Finite Volume Solution of the ...
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