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dynamic mesh problem

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Old   May 6, 2014, 07:30
Default dynamic mesh problem
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ahmady.a
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Hi every body
I am simulating natural convection in a cavity for initial condition and then
vibrate bottom wall .moving frequency is high:40khz so my time step will be small.
but when i reduce time step to 10e-07 for exact solution, fluent doesnt sense bottom wall moving and dynamic mesh doesnt work,

Where is the problem?
Please help me.
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