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6DOF not every time-step

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Old   January 2, 2013, 12:57
Default 6DOF not every time-step
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Hi all. I'm trying to solve fluid structure interaction problem. I have a massive body on the surface of fluid. This body moves relatively slow, and I think it is not necessary to compute 6DOF dynamics at each time-step, because I need to use very small time-steps (0,0005s).
So, point is to apply 6DOF solver every 10 time-steps. But I can't find any information about this adjustment.
Can anybody help me, please?
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