How does OpenFOAM calculate displacements?

Man108 · January 10, 2017, 12:34

Hi all,
I'm a beginner of OpenFOAM. I'm trying to implement a square section (2D) with aeroelastic behaviour. I use the solver pimpleDyMFoam and I want to insert a specific stiffness along the direction Y. I suppose that OpenFOAM solves the equation F=Ku+cU+ma where F is the vector of forces, K is the stiffness matrix and u is the vector of dispacements, is it right? The problem is that I don't find where OpenFOAM does this and so I can't modify the stiffness matrix as I want.

Thanks a lot!!

floquation · January 11, 2017, 03:51

I don't know, but this might get you started in finding it:

Using "grep" you can search the OF source tree recursively for the keywords that you are looking for.
For instance, if you go to $FOAM_SRC/dynamicFvMesh (OF40), you might search for:

Code:

grep -rn "displac" .

Also look at $FOAM_SRC/dynamicMesh (OF40).

In your case directory, you may find what mesh is being used in "constant/dynamicMeshDict". Using that information may limit your search.

Man108 · January 11, 2017, 06:02

Thanks for your help Kevin!! If I find something, I'll write it here.

January 10, 2017, 12:34	How does OpenFOAM calculate displacements?	#1
Man108 New Member Join Date: Jan 2017 Posts: 2 Rep Power: 0	Hi all, I'm a beginner of OpenFOAM. I'm trying to implement a square section (2D) with aeroelastic behaviour. I use the solver pimpleDyMFoam and I want to insert a specific stiffness along the direction Y. I suppose that OpenFOAM solves the equation F=Ku+cU+ma where F is the vector of forces, K is the stiffness matrix and u is the vector of dispacements, is it right? The problem is that I don't find where OpenFOAM does this and so I can't modify the stiffness matrix as I want. Thanks a lot!!

January 11, 2017, 03:51		#2
floquation Senior Member Kevin van As Join Date: Sep 2014 Location: TU Delft, The Netherlands Posts: 252 Rep Power: 20	I don't know, but this might get you started in finding it: Using "grep" you can search the OF source tree recursively for the keywords that you are looking for. For instance, if you go to $FOAM_SRC/dynamicFvMesh (OF40), you might search for: Code: grep -rn "displac" . Also look at $FOAM_SRC/dynamicMesh (OF40). In your case directory, you may find what mesh is being used in "constant/dynamicMeshDict". Using that information may limit your search. Man108 likes this.

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January 11, 2017, 06:02		#3
Man108 New Member Join Date: Jan 2017 Posts: 2 Rep Power: 0	Thanks for your help Kevin!! If I find something, I'll write it here.