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Old   October 2, 2019, 02:50
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Hello to every one SIR i am doing sloshing analysis in tanks due to sinusoidal excitation at resonance in cfx and then i import my pressure to the transient structural. In first analysis i used 100mm mesh and in second i used 65mm mesh in cfx but when i import pressure for 100mm mesh and done transient analysis it shows that stresses are high initially then dies out with time whereas in second case stresses shows increasing decreasing sinusoidal behavior but couldnt die out with time.
SIR i want to know why is it so in transient analysis as i obtained mesh independency in cfx for 65 mm mesh size should i believe the solution for 65mm mesh in transient? Please sir guide me
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Old   October 7, 2019, 19:50
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Glenn Horrocks
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This is typical for a mesh sensitivity analysis. If the 100mm and 65mm mesh results are different then it means your results are not mesh independent, so you need to use a finer mesh again. Keep refining your mesh until you do reach mesh independence.

Usually for mesh independence checks you halve the mesh element edge length in each step. So your next mesh should have element edge length about 32mm. Of course this means your simulations are going to get very big and very slow, but that is why they run CFD on supercomputers.
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.
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cfx, transient analysis

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