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Old   April 24, 2003, 16:21
Default boundary conditions
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hiiii iam working on an Euler solver. iam stranded because of the boundary conditions. i need the solid wall boundary conditions and the far field conditions. Can anyone help me???

An advance thanx
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Old   April 24, 2003, 23:58
Default Re: boundary conditions
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Solid Wall: Normal velocity is zero. If you are using FVM then there are two possibilities. If you are using cell-centered scheme then you have a cell face on the boundary across which you need the flux. This flux will contain only pressure terms which you can interpolate from inside. Or you can use mirror boundary condition and use whatever numerical flux function you used in the interior. If you are using cell-vertex scheme, then look at An unstructured grid solver and adaptation using edge algorithm, Nitanai, Takakura and Higashino, CFD Journal, vol. 10, no. 3, 2001 which describes a nice boundary condition. Another option is the strong wall boundary condition, Wall Boundary Conditions for Inviscid Compressible Flows on Unstructured Meshes, Balakrishnan N and Fernandez G, Int. Jl. Num. Meth. Fluids}, Vol. 28, pp. 1481-1501, 1998. Far Field: Use a Riemann invariant based boundary condition. See the book by Ch. Hirsch. For lifting flows I use a vortex based condition Far-field boundary condition for transonic lifting solutions to the Euler equations, Thomas JL and Salas MD, AIAA Paper No. 85-0020, 1985.
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