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Old   November 11, 2003, 07:02
Default free slip and no slip
  #1
sreenivas
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i am solving a foam flow problem.initially i gave a boundary condition of no slip on the bubble surfaces and i got reasonable answer.but when i gave a free slip bounday condition the solution is not converging. i am getting absurd results. in both cases at the inlet and outlet i gave pressure boundary conditions.
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Old   November 11, 2003, 14:06
Default Re: free slip and no slip
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BAK_FLOW
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Hi,

why not try a mass flow inlet and static pressure outlet boundary conditions. This is a more stable set-up than pressure-pressure. Once a solution is extablished in the range desired a switch to pressure-pressure may work.

Regards,

Bak_Flow
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Old   November 12, 2003, 02:57
Default Re: free slip and no slip
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Neale
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Are you specifying static pressure inlet / static pressure outlet or total pressure inlet / static pressure outlet? If the former then of course there will be convergence difficulties because you are attempting to solve a case with an imposed pressure gradient, yet no means to balance that pressure gradient (i.e. you have removed viscous effects at the walls).

Neale.
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Old   November 13, 2003, 08:17
Default Re: free slip and no slip
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sreenivas
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BAK_FLOW AND Neale, i will try the problem as you suggested and check whether i am getting any convergence. thank you for your response.

regards sreenivas
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