# What is meshsurfaceInterpolationdeltaCoeffs

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 July 7, 2005, 06:29 Dear all what is mesh.surface #1 Member   Marco Kupiainen Join Date: Mar 2009 Posts: 31 Rep Power: 10 Dear all what is mesh.surfaceInterpolation::deltaCoeffs()? best regards

 July 7, 2005, 06:33 1/distance between cell centre #2 Senior Member   Join Date: Mar 2009 Posts: 854 Rep Power: 15 1/distance between cell centres across the faces (with adjustment for non-orthogonality). hua1015 likes this.

 July 7, 2005, 06:53 I am afraid that these values #3 Member   Marco Kupiainen Join Date: Mar 2009 Posts: 31 Rep Power: 10 I am afraid that these values are not computed correctly in my 1D application. I have a uniform mesh [-5,5] with 1000 cells generated with blockMesh, which would mean that mesh.surfaceInterpolation::deltaCoeffs() should be uniformly 100, but instead DeltaCoeffs= dimensions [0 -1 0 0 0 0 0]; internalField nonuniform List 999 ( 40956.7 40915.3 40873.9 40832.5 40791.1 40749.8 40708.4 40667 40625.6 40584.2 .... 611.791 572.431 533.179 494.062 455.114 416.384 377.936 339.869 302.324 265.524 229.827 195.835 164.614 138.068 119.387 ) ; boundaryField { left { type calculated; value uniform -21966.1; } right { type calculated; value uniform 225.004; } empty { type empty; } } which is wrong. I tested also for a 2D grid, but here the output is correct. What are boundaryFields used for? For the 2D grid these values are twice the internalfield. Is the problem in blockMesh or elsewhere you think? my blockMeshDict looks like convertToMeters 1; vertices ( (-5 0 0) (5 0 0) (5 0.01 0) (-5 0.01 0) (-5 0 0.01) (5 0 0.01) (5 0.01 0.01) (0 0.01 0.01) ); blocks ( hex (0 1 2 3 4 5 6 7) (1000 1 1) simpleGrading (1 1 1) ); edges ( ); patches ( patch left ( (0 4 7 3) ) patch right ( (1 2 6 5) ) empty empty ( (0 1 5 4) (5 6 7 4) (3 7 6 2) (0 3 2 1) ) ); mergePatchPairs ( ); best regards

 July 7, 2005, 07:56 Hi, Have you checked, loook #4 Super Moderator     Niklas Nordin Join Date: Mar 2009 Location: Stockholm, Sweden Posts: 693 Rep Power: 22 Hi, Have you checked, loooked at, your mesh? It looks, to me, like the last point is incorrect/misplaced. Which, again to me, is indicated by these values not being what you expect. N

 July 7, 2005, 08:25 Correct, my mistake. Thank you #5 Member   Marco Kupiainen Join Date: Mar 2009 Posts: 31 Rep Power: 10 Correct, my mistake. Thank you Niklas! Now it works, but I'm still puzzeled about the boundary values. Why are they twice the inner values?

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