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DFBI : Ship Motion (roll, heave, pitch) at 30deg beam sea

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Old   January 19, 2016, 22:29
Default DFBI : Ship Motion (roll, heave, pitch) at 30deg beam sea
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I've been working on a 32m Tugboat (doing calm water resistance). My boss then asked me to do an analysis of the ship at 30 deg beam sea in order to find the resistance and motion of the ship.
When i run the simulation without DFBI (Dynamic Fluid Body Interaction), the simulation just works fine and i am able to find the resistance. WHen i introduce DFBI, my simulation just gets messed up and i would be getting negative volumes after it passes the release time. I'll place an attachment of the scalar scene of it.

All my set up it the same except for orientation of the ship the coordinate system (which i rotated) The regions has remained the same (5 Velocity Inlets 1 Pressure Outlet). For the model i've chosen Implicit Unsteady, Eulerian Multiphase, K-epsilon turbulence, VOF and VOF waves. My meshes remains the same because i was just testing it out. For the DFBI, i've selected z-motion, x-rotation, y-rotation.

This is my first time working with this and I could really use some guidance.

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Old   July 7, 2016, 06:27
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did you solve problem?
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Old   November 23, 2018, 11:32
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if you want to simulate ship motion, the ship shouldn't be fixed in all directions meaning that to simulate ship motion just in the vertical plane, for example, it should be free at heave and pitch directions (2dof). Additionally, in such simulations, you must generate 2 mesh zone: a stationary and a moving zone. if you use computational grid used in static simulation in a dynamic simulation, it will definitely be failed because some volume mesh will be collapsed.
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