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-   -   Time step sizing for 3D sliding mesh problem (http://www.cfd-online.com/Forums/main/90142-time-step-sizing-3d-sliding-mesh-problem.html)

happyman July 1, 2011 09:19

Time step sizing for 3D sliding mesh problem
 
Hi all,

I am running a turbomachinery problem (stator-rotor-stator) in 3D with an unsteady sine wave input. I am currently investigating time step size and its effect on my solution. At a rotational speed of 300rpm a time step of 0.01 seems to be good. My question is when i go to higher speeds, say 600rpm, do i keep the same time step (0.01s) or do i have to keep the same degree of rotation per time step (i've seen this mentioned in a paper) which would be 0.05 deg rotation per time step?? better again, does anyone have literature on this???

Thanks in advance.


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