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Dear all,
About the 1st que
Dear all,
About the 1st question my post on Sep 21, that is: The three point coordinates are (4.41226e-05,5.79779e-05), (4.71079e-05,6.24456e-05), (4.2272e-05,5.92143e-05); The circle center coordinate is:-(4.469e-05,6.083e-05)-----this is correct, I have compared with gmsh geo file The diamter of the circle is:5.81612e-06-----however, the diameter should be 5.93 micrometer (I am sure the equation to calculate diameter is right: 2*sqrt(....)). In order to check why, I plot the following pictures, Pic 1 from Gmsh geometry, Pic 2 with the output information. http://www.cfd-online.com/OpenFOAM_D...ges/1/9416.png Pic 1 http://www.cfd-online.com/OpenFOAM_D...ges/1/9417.png Pic 2 Finding: I need to check if the one point coordinate of three points are the point on the circle? I could not find them in the file constant/polyMesh/points!!! is the point the middle of the circle points? (I guess) I have two png figures. I find point 1143 coordinate is: (4.25934e-05 5.87334e-05 0) while our one point output (the one near point 12) is: (4.41226e-05,5.79779e-05,5e-06), while point 12 is: (4.469e-05 5.7865e-05 0) The way I get these three points: const vectorField & pp = patch().Cf(); vector p0, p1, p2; if (pp.size() >= 3) { p0 = pp[0]; p1 = pp[1]; p2 = pp[2]; } I could not fully understand this numerical discrepancy. would you please give me any hint? Thank you for your attention. Bin |
After test, I know that my way
After test, I know that my way to get the point coordinate is wrong,
const vectorField & pp = patch().Cf(); I must find a way out. |
Today I compared the Gmsh poin
Today I compared the Gmsh points coordinates with the file "points", at last I am sure:
const vectorField & pp = patch().Cf(); could return the middle point of each mesh face. Then I think since the function Cf() could get the point coordinate, I many use the way it used. I find "makeFaceCentresAndAreas" in "primitiveMeshFaceCentresAndAreas.C", Then I use the way it used: ------------------- vector p0, p1, p2; const pointField& p=points(); const faceList& fs = faces(); forAll (fs, facei) { const labelList& f = fs[facei]; p0=p[f[0]]; p1=p[f[1]]; p2=p[f[2]]; } -------------------- when I compile, I get: -------------------- error: 'points' was not declared in this scope error: 'faces' was not declared in this scope Since we are already in the "circleSlip" type, I do not want to use label patchID = mesh.boundaryMesh().findPatchID("circle"); to specify the patch.Otherwise we need many findPatchID("circle1"), findPatchID("circle2")....; This is not what I want, just like the slip already in OpenFOAM, whenever sb want circleSlip boundary, it could get the points on the circle. If you have any hints about this, i.e. how to get the point coordinates, I would like to thank you in advance. I must conquer this even though I may not good at OpenFOAM. Thank you for attention. Best regards, bin |
Could I ask in OpenFOAM, which
Could I ask in OpenFOAM, which plane we are using for the 2-D models? Is it in the front(z=0)? in the back(z=1e-5)? or in the middle plane(5e-6)?
Best regards, Bin |
It is solved about how to get
It is solved about how to get the diameter for a circle patch.
If anyone needs this, just write to me: zhoubinwx@hotmail.com let me go on with the boundary condition setting, and hope to finish soon and correctly. Bin |
Dear foamers,
After I imple
Dear foamers,
After I implement my boundary, the simulation goes on for several minutes, but then I get an error, please allow me to post it here, to see if some friends have experience dealing with this. The error is: #0 Foam::error::printStack(Foam:http://www.cfd-online.com/OpenFOAM_D...part/proud.gifstream&) in "/home/zhou/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/home/zhou/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #2 Uninterpreted: [0xffffe420] #3 Foam::PBiCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/home/zhou/OpenFOAM/OpenFOAM-1.5/lib/linuxGccDPOpt/libOpenFOAM.so" #4 Foam::fvMatrix<foam::vector<double> >::solve(Foam::Istream&) in "/home/zhou/OpenFOAM/OpenFOAM-1.5/applications/bin/linuxGccDPOpt/simpleFoam" #5 Foam::lduMatrix::solverPerformance Foam::solve<foam::vector<double> >(Foam::tmp<foam::fvmatrix<foam::vector<double> > > const&) in "/home/zhou/OpenFOAM/OpenFOAM-1.5/applications/bin/linuxGccDPOpt/simpleFoam" #6 main in "/home/zhou/OpenFOAM/OpenFOAM-1.5/applications/bin/linuxGccDPOpt/simpleFoam" #7 __libc_start_main in "/lib/libc.so.6" #8 Foam::regIOobject::readIfModified() in "/home/zhou/OpenFOAM/OpenFOAM-1.5/applications/bin/linuxGccDPOpt/simpleFoam" If you know, please let me know. Really appreciate your attention. Best regards, Bin |
volVectorField_Tangential Component
Dear Zhou Bin,
I try to find tangential component of gradient. I read all of your posts. Did you define tangential components of any vector as a volVectorField. You wrote previous post, volVectorField U_t=U_n*(n&U) How can you define it??? This thread is very old maybe you got it so I want to ask you? Thank you for your helping. :confused: |
Hi,
as we all know all of us learn from mistakes others committed while dealing with CFD. That is why we visit the site to get ideas and to learn from others mistakes and to share our mistakes and ideas. Hence, I would like you to post how you solve your problem as I encounter the same error flag message with s similar act to implement a rampedFixedValue BC. Cheers! |
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Thanks! |
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I think you make a mistake in writing the boundary type you just created as rampedFixValue rather than rampedFixedValue , hopefully that may be one cause from what can be sen from the displayed code. Cheers! |
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what was the problem and how did you solve it? |
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