|December 20, 2005, 02:55||
Initial conditions for airfoil in c-grid
I am simulating an airfoil in a flow. my solver is a fractional step non-staggered unsteady 2d NS FVM solver. I'm also using a rhie-chow interpolation.
if i set the initial conditions as u=1 throughout the c grid's cell center and u=1 at the faces of the outer boundaries cells, after about 10 time steps, I get a reasonable answer with the far field velocities around u=1.
however, if i now set u=1 at the only outer boundaries cells' center and faces, I'll set u=1.5-1.9, with bigger values at the boundaries.
May I know why this is so? In the 2nd case, I'm trying to simulate a transient condition such that the flow start from the left. Is there anything wrong?
how should the initial condition for the velocities be set and what is the basis?
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