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September 29, 2004, 02:36 |
Boundary conditions
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#1 |
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Hi,
I'm considering a 2D oscillating cylinder (longitudinal direction) and adopt the method which the frame of reference is fixed onto the cylinder. For the cylinder, I know that the velocity should be u=v=0. Also, the Navier Stokes equation should include an acceleration term, thus du/dt=(1/Re)(Laplacian u)-dp/dx-udu/dx-vdu/dy-dUo/dt whereby Uo is the velocity of oscillation. What I am not clear of is what outer boundary conditions should be used. Can I use the convective boundary condition of du/dt + Udu/dx =0, or should there be an additional term, du/dt + Udu/dx - dUo/dt = 0? |
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