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Old   October 28, 2004, 19:46
Default Steady to Unsteasy
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I am working on a Research code, and the first step of work assigned to me is to change the steady state code to Unsteady one.

I heard that to start with, it is good to try a fully implicit one, as the modifications required(in the code) is very less, but still i face some problems in doing so, can any one help me in going about it ???

I have some modification done, to convert the code to unsteady, can any one let me know how to validate the same, with a simple test case ?

Hope things are clear, let me know if u need more clarifications.

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Old   October 28, 2004, 21:09
Default Re: Steady to Unsteasy
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on this site there is a resourse link .. there u have link to benchmark case ..u can try them
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Old   October 29, 2004, 12:57
Default Re: Steady to Unsteasy
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For a first test, you might try to get the new code to reproduce a steady problem done with the original code.
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Old   October 30, 2004, 15:13
Default Re: Steady to Unsteasy
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A good way to go is the probably this:

Take a steady solution as the initial condition (say Couette Flow at low Re) and march in time. You don't want to pick flows that go unstable quickly or flows that are highly sensitive to numerical dissipation. If your solution goes unsteady, you have a bug in your code.
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