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???Weird value of gamma field I got in my BC file! |
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December 6, 2009, 20:54 |
???Weird value of gamma field I got in my BC file!
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#1 |
Member
jingjing
Join Date: Mar 2009
Location: shanghai,China
Posts: 30
Rep Power: 17 |
I'm coding a new boundary condition to be used in interFoam solver to solver free-surface problem.
I have to make use of the transient gamma value in my boundary condition.So I add the following to my boundary condition file: Code:
void waveMakerVelocityOFvPatchVectorField::updateCoeffs() { .... const fvMesh& mesh = this->dimensionedInternalField().mesh(); const fvPatchScalarField& gamma = this->patch().lookupPatchField<volScalarField,scalar >("gamma"); scalar cellLabel(0); for(int i=0;i < 60;i++) { scalar y=-0.6+0.6/30/2+0.6/30/2*i; //fetch the gamma value at the cells at the boundary point cellProbe(0,y,0.005); cellLabel=mesh.findCell(cellProbe);// if(cellLabel==-1) { FatalError<<"select x again please" << nl << exit(FatalError); } else { Info<<i<<" "<<gamma[cellLabel]<<endl; // write the gamma value } } ..... } You see: .... Create mesh for time = 0 ........ (the output gamma values at the inlet boundary cells) 0 1 1 1 2 1 3 1 4 1 5 100 6 100 7 100 8 1.196806e-311 9 1.196806e-311 10 1.273197e-313 11 1.273197e-313 12 100 13 0.002 14 0.002 15 0.002 16 0.002 17 0.002 18 0.002 19 1.304015e-259 20 1.304015e-259 21 1.304015e-259 22 5.24133e-312 23 5.24133e-312 24 0 25 0 26 0 27 0 28 0 29 0 30 2.631275e-311 31 3.692273e-311 32 3.692273e-311 33 4.751149e-311 34 4.751149e-311 35 5.812146e-311 36 5.812146e-311 37 1 38 1 39 0 40 0 41 0 42 0 43 0 44 0 45 0 46 0 47 1.273197e-313 48 1.273197e-313 49 1.273197e-313 50 1.273197e-313 51 1.273197e-313 52 1.273197e-313 53 1.273197e-313 54 1.273197e-313 55 1.273197e-313 56 1.273197e-313 57 1.273197e-313 58 1.273197e-313 59 1.273197e-313 ..... Starting time loop Courant Number mean: 5.276506e-05 max: 0.1283081 deltaT = 0.025 Time = 0.025 MULES: Solving for gamma Liquid phase volume fraction = 0.5 Min(gamma) = 0 Max(gamma) = 1 MULES: Solving for gamma Liquid phase volume fraction = 0.5 Min(gamma) = 0 Max(gamma) = 1 0 1 1 1 2 0 3 0 4 0 5 0 6 0 7 0 8 3.038e-06 9 3.038e-06 10 3.4544e-08 11 3.4544e-08 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 0 20 0 21 0 22 0 23 0 24 0 25 0 26 0 27 0 28 0 29 0 30 0 31 0 32 0 33 0 34 0 35 0 36 0 37 0 38 0 39 0 40 0 41 0 42 0 43 0 44 0 45 0 46 0 47 0 48 0 49 0 50 0 51 0 52 0 53 0 54 0 55 0 56 0 57 2.444049e-11 58 2.444049e-11 59 2.444049e-11 DICPCG: Solving for pd, Initial residual = 1, Final residual = 0.04963077, No Iterations 8 DICPCG: Solving for pd, Initial residual = 0.01135738, Final residual = 0.0005306475, No Iterations 10 0 1 1 1 2 0 3 2.500615e-138 4 2.500615e-138 5 3.74594e-132 6 3.74594e-132 7 3.74594e-132 8 2.498814e-05 9 2.498814e-05 10 0.01963497 11 0.01963497 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 1.580227e-10 20 1.580227e-10 21 1.580227e-10 22 1.959051e-30 23 1.959051e-30 24 5.769587e-114 25 -1.102479e-14 26 -1.102479e-14 27 -1.102479e-14 28 -1.198783e-28 29 -1.198783e-28 30 0 31 -3.565092e-10 32 -3.565092e-10 33 0 34 0 35 -1.426689e-26 36 -1.426689e-26 37 0 38 0 39 0 40 0 41 0 42 0 43 0 44 0.004 45 0 46 0 47 0 48 0 49 0.004 50 0.004 51 0 52 0 53 0 54 0 55 0 56 0 57 2.498814e-05 58 2.498814e-05 59 2.498814e-05 DICPCG: Solving for pd, Initial residual = 0.004856249, Final residual = 9.476824e-08, No Iterations 81 0 1 1 1 2 3.958101e-34 3 2.500615e-138 4 2.500615e-138 5 3.74594e-132 6 3.74594e-132 7 3.74594e-132 8 2.498814e-05 9 2.498814e-05 10 0.01963497 11 0.01963497 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 1.580227e-10 20 1.580227e-10 21 1.580227e-10 22 1.959051e-30 23 1.959051e-30 24 5.769587e-114 25 1.368002e-07 26 1.368002e-07 27 1.368002e-07 28 -7.210361e-16 29 -7.210361e-16 30 0 31 2.202605e-06 32 2.202605e-06 33 0 34 0 35 2.873679e-29 36 2.873679e-29 37 0 38 0 39 0 40 0 41 0 42 0 43 0 44 1 45 -0 46 -0 47 -0 48 -0 49 1 50 1 51 -0 52 -0 53 -0 54 -0 55 0 56 0 57 2.498814e-05 58 2.498814e-05 59 2.498814e-05 time step continuity errors : sum local = 2.312163e-09, global = -7.946274e-10, cumulative = -5.132373e-06 ExecutionTime = 2.75 s ClockTime = 3 s ........ How could some 100 pop out at the time=0s? Even though the value between 0~1, the values distributing at the inlet boundary are obviously incorrect!!! How can I fetch the correct transient gamma value in my boundary condition file? Thank you for your attention! |
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December 8, 2009, 14:58 |
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#2 |
Senior Member
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 20 |
Maybe you should try to use the timeVaryingMappedFixedValue boundary condition if you need transient boundary values.
It will be less work than creating your own boundary condition ...
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!" |
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March 5, 2010, 10:15 |
Maybe a bug!
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#3 |
Member
jingjing
Join Date: Mar 2009
Location: shanghai,China
Posts: 30
Rep Power: 17 |
Sorry, it's a little late to tell what I found about this problem.Anyway,better later than never. Maybe somebody will give a detailed explanation on this phenomenon:
If I use this sentence : const volScalarField& gamma = this->db().objectRegistry::lookupObject<volScalarField> ("gamma"); instead of fvPatchScalarField& gamma = this->patch().lookupPatchField<volScalarField, scalar>("gamma"); then I get the correct gamma value. Who can give an explanation? Thanks. |
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