Dear Andriy, Thank you for your quick answer, Unfortunately, my mesh is not axisymmetric. I need to take into account the 2D shape of my mesh. My question was about the ways of applying centrifugal force on it. But here may be one solution : I just noticed that if I use the standard source term brick I can apply all the forces I previously calculated on the nodes in only one step! But I don't understand why the applied force resulting is so low.
gf_model_set(md, 'add initialized fem data', 'VolumicData', mfd,[Fx_On_nodes,Rotor.Fy_On_nodes] ); gf_model_set(md, 'add source term brick', mim, 'u', ['VolumicData']); Do you have any idea ? Or another way to do so ? Thank you again for your help, Simon De : Andriy Andreykiv [mailto:andriy.andrey...@gmail.com] Envoyé : jeudi 1 février 2018 16:34 À : SIMON AMEYE - U510180 <simon.am...@mpsa.com> Cc : getfem-users@nongnu.org; philippe.marchne...@gmail.com Objet : Re: [Getfem-users] Centrifugal force >>> Real sender address / Reelle adresse d expedition : >>> andriy.andrey...@gmail.com<mailto:andriy.andrey...@gmail.com> <<< ________________________________ Dear Simon, I think one way to greatly speed up your program is to take into account the axi-symmetry of your problem. Getfem fully supports it. That would mean that you can reduce your 2D problem to 1D. You can create a simple line mesh, but using a type torus_mesh and subsequently create torus_mesh_fem on it. Then you need to apply your force on a single edge/point of your mesh. Best regards, Andriy On 1 February 2018 at 08:35, SIMON AMEYE <simon.am...@mpsa.com<mailto:simon.am...@mpsa.com>> wrote: Hi all, I am asking for help again about my computation, that now works fine thanks to you, but slowly. My 2D mesh represents a part that is spinning around a point (0,0). To considerate the centrifugal force, I now calculate the area of each element, and apply a force using "source term brick" on its boundaries. The problem is that add 2000 sources terms for 2000 elements is slow. Do you have any idea of which brick I need to use to set the force in one step ? The centrifugal force is described this way : " F=constant*R " where R is the distance between the rotation point and the element. To get an idea about my actual code, here it is : Setting all the regions by locating the faces for i = 1:NumberOfElements ftri_rand = get(rot_mesh,'faces from cvid',(i+1)); rot_mesh.set_region(i, ftri_rand); end Applying a force on each region for i = 1: NumberOfElements gf_model_set(md, 'add initialized data', ['VolumicData' num2str(i)], [Fx_tri(i), Fy_tri(i)]./Perimeter(i)); gf_model_set(md, 'add source term brick', mim, 'u', ['VolumicData' num2str(i)], i); end Thank you again for your help, Simon Ameye [cid:image001.png@01D193D3.0D03A420] SIMON AMEYE DQI/DRIA/DSTF/SEPC Apprenti IFP School ________________________________ CENTRE TECHNIQUE VELIZY A /
