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Impulsive modal component in Cylindrical tank

Impulsive modal component in Cylindrical tank

Impulsive modal component in Cylindrical tank

(OP)
Hi!
I am trying to simulate a cylindrical tank using Ansys. I have already built the model (using shell181 for tank wall, fluid80 for the content and coupling dof in normal direction to the tank wall) and performed modal analysis, obtaining sloshing frequencies. What do I have to change in my 3d model to get the impulsive modes and frequencies, as well?
Thank you in Advance

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