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time step changes with velocity in transient simulations

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Old   February 5, 2011, 22:30
Default time step changes with velocity in transient simulations
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Do we need to change the time step if we change the velocity of the fluid in the pipe. I am running simulations for slurry flow flow in pipes and I need to see pressure drops for different reynold number. So with a time step for a particular reynolds number, i get my desired results but for a different reynolds number should I change my time step ?
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Old   February 6, 2011, 11:56
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Hi sunny,
it's better to have a same relation for your cases. for example dt=0.01*(residence time)
residence time=L/V. by these assumptions you can have reasonable comparison between cases.
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