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suitable boundary conditions

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Old   November 7, 2009, 05:10
Default suitable boundary conditions
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S M Khan
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i imorted a mesh of multiple blocks. viz. 3 blocks. innermost block is having a very fine mesh and enclosing a pleated airfoil. outermost block and 2nd outermost blocks are having coarser mesh in the FLUENT. and this blocks resembles like a rectangle. i put the boundary conditions as velocity inlet at the entrance, outflow at the exit, upside and downside of the rectangular mesh are kept as outflow condition but not allowed to go out from these two sides. Thereafter, i run it with a time step size 0.01 and 50000 iterations. but there is no vortex shedding near airfoil what is the reason of not forming vortex shedding. please let me know the conditions to be put on the mesh to get the vortex shedding near the airfoil.

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boundary conditions, fluent, vortex shedding

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