# using non-orthogonal correction for the laplacian term

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 January 3, 2011, 12:45 using non-orthogonal correction for the laplacian term #1 Senior Member   Steven van Haren Join Date: Aug 2010 Location: The Netherlands Posts: 149 Rep Power: 7 Dear all, Hopefully one of you can help me with the following question: If one uses (in fvSchemes): laplacian(nu,U) Gauss linear corrected; which correction is referred to? minimum correction, orthogonal correction or over-relaxed? (as referred to in the thesis of Jasak) Thanks in advance.

 January 3, 2011, 23:29 #2 Senior Member   Travis Carrigan Join Date: Jul 2010 Location: Arlington, TX Posts: 128 Rep Power: 7 Hello, I believe this is simply an orthogonal correction, used mainly for highly orthogonal grids (such as high aspect ratio anisotropic tets).

January 4, 2011, 04:17
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Steven van Haren
Join Date: Aug 2010
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Posts: 149
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Quote:
 Originally Posted by tcarrigan Hello, I believe this is simply an orthogonal correction, used mainly for highly orthogonal grids (such as high aspect ratio anisotropic tets).
Hi travis,

Ok, I understand this, I try to use it on polyhedral grids. But do you also know how this orthogonal correction is implemented? Jasak refers to three different possibilities (minimum correction, orthogonal correction or over-relaxed) which are all orthogonal corrections bu with different numerical behaviour.

 January 8, 2011, 00:28 #4 Senior Member     Santiago Marquez Damian Join Date: Aug 2009 Location: Santa Fe, Santa Fe, Argentina Posts: 420 Rep Power: 15 Until we've studied over-relaxed approach is what is implemented. Take a look of gaussLaplacianScheme.C lines 169-173, correctedSnGrad.C lines 56-108 and surfaceInterpolation.C lines 270-384. Regards. Tushar@cfd, fumiya and msuaeronautics like this. __________________ Santiago MÁRQUEZ DAMIÁN, Ph.D. Post-doctoral Fellow Research Center for Computational Mechanics (CIMEC) - CONICET/FICH-UNL T.E.: 54-342-4511594 Ext. 1005 Güemes 3450 - (3000) Santa Fe Santa Fe - Argentina http://www.cimec.org.ar

 January 10, 2011, 08:58 #5 Senior Member   Steven van Haren Join Date: Aug 2010 Location: The Netherlands Posts: 149 Rep Power: 7 Great references to the code lines Santiago! It is very clear now to me.

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