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Old   June 17, 2011, 09:15
Question Mesh/Time step Independence
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Hi all!

Quick query which I am look for some clarification on. I am running a simple flow analysis in a u-bend and have completed a 'steady' investigation. I have also carried out a grid independence test for this and thus have a 'good quality' mesh (backed up with graphs showing force convergence, pressure etc )

Now I am looking to carry out an unsteady investigation, however this involves a time step. So can I keep the same grid I used in the steady investigation or do I and just investigate the effect of a varying time step? Or do I need to re-evaluate the mesh under unsteady conditions and then vary the time step size. If the latter then which do I alter first ? Time step or Mesh size?

Help :-/
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