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How to calculate the damping moment acting on a sloshing tank bottom?

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Old   March 26, 2015, 06:18
Post How to calculate the damping moment acting on a sloshing tank bottom?
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I have a 2D tank with non-harmonic roll motion. And there is some water inside sloshing. I would like to calculate the damping moment acting on the bottom and plot a time history of the moment. I am new to OpenFOAM and now after my simulation, I can only find data of p and U.

I am wondering if I need to add an additional function object into ControlDict to define the moment, but I do not exactly know how to define the 'forces' function object( which is mentioned briefly here Does anyone have suggestions that how to do it or any idea of how to find the moment on the bottom? Any information is appreciated!
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