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January 30, 2013, 11:39 
Custom Source Terms

#1 
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I'm also interested in adding some custom source terms. Could you please explain the best approach to do that?


January 30, 2013, 11:51 

#2 
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Amrita Lonkar
Join Date: Nov 2012
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The best place to add new source terms to the flow equations is in the method called "Source_Template" in the file solution_direct_mean.cpp.
This method is directly connected to the rest of the code, which makes it easy to implement new source terms. You will have to specify the following option in the configuration file to activate it. SOUR_NUM_METHOD_FLOW= PIECEWISE_CONSTANT I would also recommend that you download the new version of SU2 that will be available towards the mid of February for this particular problem, it will include some important changes to ease the implementation of new source terms. Thanks again for your questions! Let me know if you need more assistance, we are very happy to help potential developers! Last edited by Amrita Lonkar; January 30, 2013 at 12:15. 

January 31, 2013, 01:34 

#3 
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Sean R. Copeland
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Just a follow up on Amrita's comments:
The inviscid fluxes, viscous fluxes, and source terms are all handled independently of one another and you can see the structure by taking a look at CIntegration::Space_Integration in the integration_structure.cpp source code file. A selection of PIECEWISE_CONSTANT integration of the source terms allows for rapid implementation of new source terms in the CSource_Template class located in the numerics_source.cpp file. There are plenty of examples of specialized source terms in numerics_source.cpp that you can reference as you input your own custom source terms. Regards, Sean 

February 18, 2013, 00:05 

#4 
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I need to use the xyz data for the current node in the calculation of my custom source terms. I'm trying to use the 'Coord_0' variable that I set with 'SetCoord' in 'solution_direct_mean.cpp'.
However, I get a segmentation fault when I try to use the 'Coord' variables in 'numerics_source.cpp'. Excerpt from 'numerics_source.cpp': Code:
void CSource_Template::SetResidual(double *val_residual, double **val_Jacobian_i, CConfig *config) { double P,rho_u,rho_v,rho_w, xx, yy,zz,Beta_Sq,Core,L,K,A0,A1,A2,A3, mx,my,mz, Ax,Ay,Az,dmx_dx,dmy_dy,dmz_dz,dAx_dx,dAy_dy,dAz_dz,dBx_dx,dBy_dy,dBz_dz, dCx_dx,dCy_dy,dCz_dz,d2Ax_dxx,d2Ay_dyy,d2Az_dzz,dCore_dx,dCore_dy,dCore_dz, dCore_dxx,dCore_dyy,dCore_dzz,dP_dx,dP_dy,dP_dz,drho_u_dx,drho_u_dy,drho_u_dz, drho_v_dx,drho_v_dy,drho_v_dz,drho_w_dx,drho_w_dy,drho_w_dz,drho_u_dxx,drho_u_dyy, drho_u_dzz,drho_v_dxx,drho_v_dyy,drho_v_dzz,drho_w_dxx,drho_w_dyy,drho_w_dzz, rho, Beta_Squared, S1,S2,S3,S4,mu_tot; cout << "Get Coordinates " <<endl; xx = Coord_0[0]; yy = Coord_0[1]; zz = Coord_0[2]; cout << "Coordinates set" << endl; 

February 20, 2013, 02:42 

#5 
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Thomas D. Economon
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Location: Stanford, CA
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Hi,
Sounds like you are on the right track... An example might be setting the following in solution_direct_mean.cpp: Code:
/* Set coordinates */ solver>SetCoord(geometry>node[iPoint]>GetCoord(),geometry>node[iPoint]>GetCoord()); Hope this helps! 

February 28, 2013, 23:04 

#6 
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I've added the following code in the CEulerSolution::Source_Residual method:
Code:
if (MMS) { /* loop over points */ for (iPoint = 0; iPoint < geometry>GetnPointDomain(); iPoint++) { if ( !geometry>node[iPoint]>GetBoundary() ) { /* Set solution */ solver>SetConservative(node[iPoint]>GetSolution(), node[iPoint]>GetSolution()); /* Set incompressible density */ solver>SetDensityInc(node[iPoint]>GetDensityInc(), node[iPoint]>GetDensityInc()); /* Set beta squared */ solver>SetBetaInc2(node[iPoint]>GetBetaInc2(), node[iPoint]>GetBetaInc2()); /* Set control volume */ solver>SetVolume(geometry>node[iPoint]>GetVolume()); /* Set coordinates for MMS */ solver>SetCoord(geometry>node[iPoint]>GetCoord(),geometry>node[iPoint]>GetCoord()); /* Compute Source term Residual */ solver>SetResidual(Residual, Jacobian_i, config); //MMS Modification /* Set Source Residual */ //node[iPoint]>SetRes_Sour(Residual); node[iPoint]>AddRes_Conv(Residual); } //added IF for MMS Modification } } 

March 18, 2013, 16:46 

#7 
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I'm also wondering if the source terms should be nondimensionalized. If so how are the solution variables nondimensionalized in the solver code?


March 24, 2013, 00:04 

#8  
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Francisco Palacios
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Quote:
The nondimensionalization of the code is described in http://su2.stanford.edu/documents/SU2_AIAA_ASM2013.pdf Best, Francisco 

March 24, 2013, 21:02 

#9 
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I've been using that document, but it mentions an "internal document" by Prof. Feng Liu: "Nondimensionalization of the NavierStokes Equations" that might be the missing piece that I need.
I'm trying to write custom source terms so that I can conduct a verification of the order of accuracy of the code using the Method of Manufactured Solutions (MMS). So far it's not working, and I think it's due to the nondimensionalization of the source terms (or there's a problem with this part of the code). 

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