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simulation of rigid solid falling in a tank of water in OverInterDyMFoam

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Old   June 30, 2023, 06:21
Default simulation of rigid solid falling in a tank of water in OverInterDyMFoam
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I am pretty new to CFD. I am trying to modify the floatingBody tutorial in the overInterDyMFoam solver of OpenFOAM-v2212 to simulate a rigid solid body falling in a tank of water. To do so, I have increased the size of domain a little in the blockMesh file, adjusted setFields to have water level a little below the solid( floatingObject patch ). Also, I have increased the value of rhoSolid to 2700( density of rock) in the dynamicMeshDict file.

With this setup I was hoping that the whole background mesh will serve as the tank with the patch stationaryWalls serving as the walls of tank and the solid defined in overset mesh will fall to the bootom surface of this tank.

But, when I run my simulation after these changes, there are 2 problems:
(i) When the solid body reaches the bottom surface, it does not collide and stop there. The solid moves right through the bottom face and moves out of the domain defined in blockMesh of background mesh. I don't know if this a feature of Overset meshes. Is there a way to make it stop at the bottom surface and keep it inside the defined domain only.

(ii) The solid moves in oscillatory fashion in the vertical direction just like a piston. It is similar to how it is in the original tutorial simulation of floatingBody. On changing the density of the body the magnitude of oscillation increases. I have tried commenting out all the constraints in the dynamicMeshDict file, but it did not help. If you could tell me how to change the motion into a simple free fall or where this oscillatory motion is defined, it would be a great help.

I have attached an image of solid moving out of domain.
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File Type: jpeg solid_moving_out_of_domain.0010.jpeg (40.0 KB, 24 views)
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Old   November 12, 2023, 09:23
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Kazakis Ioannis
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Dear Maya

I am very interested in your case. How do you manage the stability of the case? I am doing exactly the same but unfortunately the simulation crashes in first time steps

Kind regards

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