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-   -   time step changes with velocity in transient simulations (http://www.cfd-online.com/Forums/fluent/84680-time-step-changes-velocity-transient-simulations.html)

sandisk February 5, 2011 22:30

time step changes with velocity in transient simulations
 
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 ?

Amir February 6, 2011 11:56

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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