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Determining the time step for transient analysis

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Old   March 2, 2013, 10:57
Default Determining the time step for transient analysis
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I am doing a transient analysis ( of a Semi-submersible) for a Reynolds number of 6 X 10^7 in FLUENT.
Changing the time step gave different values .How to make sure that which time step will give the correct solution..
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Old   March 3, 2013, 06:20
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I prefer to use adaptive. It changes automatically by time gradiant of variables.
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