# Sloshing pendulum analogy

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 July 19, 2013, 02:07 Sloshing pendulum analogy #1 New Member   Anonymous Join Date: Jul 2013 Posts: 1 Rep Power: 0 Hello All, I am trying to run a simple liquid sloshing case. Initial liquid level is about 40% diameter of simple sphere. The CFD run is setup such that the liquid level initially is inclined and after one time step it sloshes under influence of gravity (acting downwards). My intention is to calculate the dominant frequencies. This can be obviously obtained by FFT of time history of force acting sideways on the tank walls. Apart from this I would like to calculate the sloshing mass and fixed mass (ref: Pendulum slosh analogy). It would be great if anyone can provide the relations to calculate the sloshing/fixed masses and subsequent pendulum lengths. Thanks you brahma likes this.

August 14, 2013, 02:56
Sloshing analogy
#2
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brahmendra S Dasaka
Join Date: Aug 2013
Posts: 1
Rep Power: 0
I am also trying to do sloshing in a rectangular tank. But the loading is harmonic acceleration. I am new to CFD and would like to do FSI. Can you please provide material for pendulum analogy for sloshing if you get the solution.

Regards.

Quote:
 Originally Posted by ybav223 Hello All, I am trying to run a simple liquid sloshing case. Initial liquid level is about 40% diameter of simple sphere. The CFD run is setup such that the liquid level initially is inclined and after one time step it sloshes under influence of gravity (acting downwards). My intention is to calculate the dominant frequencies. This can be obviously obtained by FFT of time history of force acting sideways on the tank walls. Apart from this I would like to calculate the sloshing mass and fixed mass (ref: Pendulum slosh analogy). It would be great if anyone can provide the relations to calculate the sloshing/fixed masses and subsequent pendulum lengths. Thanks you