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transition ,laminar to turbulent flow

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Old   January 11, 2013, 12:05
Default transition ,laminar to turbulent flow
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hello, I study the natural convection in a cavity in the unsteady by fluent, and I'm looking the critical number of Grashoff (transition laminar to turbulent flow).
How to draw speeds depending on time?
how to introduce the initial conditions?
how to find the number of Grashoff critic in fluent?
thank you .......... .......
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