different Meshes at different time steps

Zymon · May 11, 2010, 07:41

Hello,

First at all, I am quite new to OpenFOAM and CFD Simulations.

From a segmentation I have different meshes at different time steps (say at times 0, 0.1, 0.2, ...). Just the Position of the points change at the moment, not the amount of cells. So in my case directory I put in 0/polyMesh a points file, in 0.1/polyMesh a points file and so on. Then I ran the standard pisoFoam solver. It does work somehow and the mesh actually changes at the time steps but I don't think there is an impact of the changing mesh on the velocity and pressure variables. I found the dynamicMesh utility in the tutorials section but I guess it does something else than I want. So, is such a simulation possible and how is the correct procedure?

Thanks a lot!
Zymon

ngj · May 11, 2010, 07:52

Hi Zymon

The dynamicMesh, e.g. one of the *Dym* solvers, is what you want. The change in position of the nodal points in your model must result from some kind of motion of the boundaries. Hence describe the boundary motion to the model, and you should be able to achieve the needed results.

Best regards,

Niels

May 11, 2010, 07:41	different Meshes at different time steps	#1
Zymon Member Join Date: May 2010 Posts: 42 Rep Power: 15	Hello, First at all, I am quite new to OpenFOAM and CFD Simulations. From a segmentation I have different meshes at different time steps (say at times 0, 0.1, 0.2, ...). Just the Position of the points change at the moment, not the amount of cells. So in my case directory I put in 0/polyMesh a points file, in 0.1/polyMesh a points file and so on. Then I ran the standard pisoFoam solver. It does work somehow and the mesh actually changes at the time steps but I don't think there is an impact of the changing mesh on the velocity and pressure variables. I found the dynamicMesh utility in the tutorials section but I guess it does something else than I want. So, is such a simulation possible and how is the correct procedure? Thanks a lot! Zymon

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May 11, 2010, 07:52		#2
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,900 Rep Power: 37	Hi Zymon The dynamicMesh, e.g. one of the Dym solvers, is what you want. The change in position of the nodal points in your model must result from some kind of motion of the boundaries. Hence describe the boundary motion to the model, and you should be able to achieve the needed results. Best regards, Niels