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Vortex Shedding in air

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Old   January 3, 2000, 08:51
Default Vortex Shedding in air
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I am now doing vortex shedding in air of a structure by Fluent, the problem I got was the instability of the program that sometime it give out smooth solution but sometime it shows shedding. What should I do?

Using RMS, unsteady analysis with time interval of 1 seconds. Mesh 0.25 meter on a 40 m wide 3 meter depth object.Triangular Mesh used.
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