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Old   May 11, 2005, 06:40
Default boundary condition
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Steve
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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
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Old   May 12, 2005, 12:38
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Steve
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That's interesting that nobody made any comments on this!
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Old   May 12, 2005, 13:02
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noName
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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)?
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Old   May 13, 2005, 08:13
Default Re: boundary condition
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Steve
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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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