[mesh manipulation] falling object simulation with OpenFoam

koful · September 18, 2019, 17:48

Hello foamers.

This is my first entry at this forum. Sorry for any inconvenience.

I need to simulate a free falling object in a medium, like a rock in a water I could not find any dynamic mesh solver for this particular problem. While the object is moving to bottom, it cause a shrinkage on the meshes under it and the simulation crashes eventually.

I used sixDoFRigidBodyMotion. It can simulate the coupled motion of the object but does not remesh the domain or change the topology.

Which dynamic mesh solvers or which meshing strategy should I use? I would be very happy If you can share your comments with me.

CFD_10 · September 18, 2019, 19:58

Try Overset Mesh. Currently, it is only available in OpenFOAM ESI OpenCFD version (e.g: V1906).
Have a look at this page.

Yann · September 19, 2019, 06:17

Hello,

Check the sphereDrop tutorial, it uses layer addition/removal technique with a sixDoFRigidBodyDisplacement boundary condition to simulate a falling sphere.

Or as CFD_10 suggested, go for overset.

Cheers,
Yann

koful · September 19, 2019, 12:30

Many thanks. I will look at OpenFoam ESI.

tedspencer · September 26, 2019, 01:18

Many thanks!
the impossible quiz

September 18, 2019, 17:48	falling object simulation with OpenFoam	#1
koful Member Join Date: Jun 2014 Location: Turkey Posts: 58 Rep Power: 12	Hello foamers. This is my first entry at this forum. Sorry for any inconvenience. I need to simulate a free falling object in a medium, like a rock in a water I could not find any dynamic mesh solver for this particular problem. While the object is moving to bottom, it cause a shrinkage on the meshes under it and the simulation crashes eventually. I used sixDoFRigidBodyMotion. It can simulate the coupled motion of the object but does not remesh the domain or change the topology. Which dynamic mesh solvers or which meshing strategy should I use? I would be very happy If you can share your comments with me.

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September 18, 2019, 19:58		#2
CFD_10 Member CFD USER Join Date: May 2019 Posts: 40 Rep Power: 7	Try Overset Mesh. Currently, it is only available in OpenFOAM ESI OpenCFD version (e.g: V1906). Have a look at this page.

September 19, 2019, 06:17		#3
Yann Senior Member Yann Join Date: Apr 2012 Location: France Posts: 1,200 Rep Power: 28	Hello, Check the sphereDrop tutorial, it uses layer addition/removal technique with a sixDoFRigidBodyDisplacement boundary condition to simulate a falling sphere. Or as CFD_10 suggested, go for overset. Cheers, Yann

September 19, 2019, 12:30		#4
koful Member Join Date: Jun 2014 Location: Turkey Posts: 58 Rep Power: 12	Many thanks. I will look at OpenFoam ESI.

September 26, 2019, 01:18		#5
tedspencer New Member Ted Spencer Join Date: Sep 2019 Posts: 1 Rep Power: 0	Many thanks! the impossible quiz