# boundary condition

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 May 11, 2005, 06:40 boundary condition #1 Steve Guest   Posts: n/a I am trying to add a subroutine to a program which is a NS code using CV scheme. This sunroutine applies a specific boundary condition; as an example, it is supposed to change the velocities, pressure, and energy at a crossection at a position in the middle of a simple pipe, ie x=L/2, so for this example, 2 blocks is defined for the code. Problem is this sunroutine makes the code totally unstable, no convergence. I know based on this general info it is hard to say anything, but if there something that might be any help, please let me know. Steve

 May 12, 2005, 12:38 Re: boundary condition #2 Steve Guest   Posts: n/a That's interesting that nobody made any comments on this!

 May 12, 2005, 13:02 Re: boundary condition #3 noName Guest   Posts: n/a Are you solving for a steady solution? Or are you solving for a transient impulse response to these boundary conditions? Is there an analytic solution to such an impulse-type problem (e.g. exponential decay, similarity)?

 May 13, 2005, 08:13 Re: boundary condition #4 Steve Guest   Posts: n/a Thanks for the response. I am solving for a steady solution, and at the moment I am running the code for a very simple case which is a cylindar with 2 blocks (the code is Multi-block). I am applying this boundary condition right at the common patch between the blocks. What do you think? Steve

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