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Creating an output file with primitive variable

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Old   December 24, 2014, 03:30
Default Creating an output file with primitive variable
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I am doing internal flow simulations using Euler and want to visualize vorticity. How do I write vx, vy and vz to an output file.

I can see that vorticity is calculated for NS and I guess the same methods have to be added to the Euler part.

Last edited by viit3; December 24, 2014 at 07:03.
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Old   December 24, 2014, 13:06
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Quote:
Originally Posted by viit3 View Post
I am doing internal flow simulations using Euler and want to visualize vorticity. How do I write vx, vy and vz to an output file.

I can see that vorticity is calculated for NS and I guess the same methods have to be added to the Euler part.
you will get rho, rho*u , rho*v, rho*E in output file. from this u can get u,v (2D).
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Old   December 25, 2014, 03:56
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I think maybe I wasn't clear. I need dv/dx, dv/dy, dv/dz
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Old   December 25, 2014, 04:33
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ok fine. if you need vorticity, you can utilize some flow visualizer like Tecplot. It just needs velocity components as input, right?

But if you need derivatives of velocity components, you need to find a way to write it in a data file from SU2. Derivatives will be calculated for Euler, if you use 2nd order.
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Old   December 26, 2014, 00:45
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Paraview crashes when it tries to calculate vorticity.

I want to know exactly how to get the derivatives and write them.
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Old   December 26, 2014, 02:46
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I have not tried anything like that. But you explore the output related source files (SU2_CFD/src/*output) and add variables to write into flow files. I hope its possible.
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Old   December 26, 2014, 07:22
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I added the following lines in output_structure. I am now getting values of vorticity from them. I just want to confirm that the values I am getting are those of vorticity.

if ((Kind_Solver == EULER) || (Kind_Solver == NAVIER_STOKES) || (Kind_Solver == RANS)) {
/*--- Vorticity ---*/
nVar_Total += nDim;
}


double **gradsWrite = solver[FLOW_SOL]->node[iPoint]->GetGradient_Primitive();
double *vort = new double[nDim];
vort[0] = gradsWrite[3][1]-gradsWrite[2][2];
vort[1] = gradsWrite[1][2]-gradsWrite[3][0];
vort[2] = gradsWrite[2][0]-gradsWrite[1][1];
for(int i=0;i<nDim;i++)
{
Data[jVar][jPoint] = vort[i]; jVar++;
}
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Old   December 26, 2014, 08:43
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Looks fine to me.!!!
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