|September 11, 2009, 03:26||
symmetryPlane vs slip and zeroGradient (possible bug)
Join Date: Mar 2009
Location: Gothenburg, Sweden
Posts: 18Rep Power: 9
I'm currently running a LES simulation of a cylinder, with a prescribed sinusoidal movement, in a steady stream. The mesh boundary has the shape of a cuboid. I have employed the following boundary conditions in the pointDisplacement file, top/bottom [fixedValue (0,0,0)], left-side/right-side [symmetryPlane], Inlet/Outlet [fixedValue (0,0,0)] and for the cylinder [oscillatingDisplacement, amplitude(0.02435 0 0),omega 1.759].
The problem arises when I increase the grid resolution. I then get a perturbation in the pointDisplacement field (in the y and z-direction! according to the boundary conditions the analytical solution should be zero everywhere!). It starts on the symmetryPlane boundary and spreads and in the end makes the simulation crash. Changing the BC to be slip (vectors) and zeroGradient (scalars) works!
Should there really be a difference?
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