[Wowbagger]

Hi everyone,

I want to simulate a kind of tubular heat exchanger and prepared the mesh via blockmesh.
Because of its symmetry I made the model as a wedge.

Maybe this is irrelevant depending my question but I get the same warning for a change in the geometry setup.
For some bigger angles I get the known (?) error below.

--> FOAM Warning : From function virtual void Foam::wedgePolyPatch::calcGeometry(Foam::PstreamBu ffers&) in file meshes/polyMesh/polyPatches/constraint/wedge/wedgePolyPatch.C at line 70 Wedge patch 'symmetrie_back' is not planar.At local face at (2.925 119.75 0.102082) the normal (-0.0348784 -1.37971e-17 0.999392) differs from the average normal (-0.0348783 -3.67866e-20 0.999392) by 7.88202e-15Either correct the patch or split it into planar parts

So far so good. This should not really a problem as I read but to avoid this I use to go to really tiny angles.
All constructive data are set as parameters in the first part of the blockMeshDict file.
There comes the strange thing, I recognised that it is not a problem to do some calculation with the parametric setup but for the grading it is not possible.

I did the grading as shown below according to this file: http://www.wolfdynamics.com/wiki/mes..._blockmesh.pdf

hex (4 6 7 5 22 24 25 23) ($ZR3 $ZL1 1) simpleGrading              // Block 4 Fluid Wärmeaufnahme
        (
            (
            //x-Achse
            ($BB $DD $EE) 
            ($AA $CC 1) 
            ($BB $DD $FF) 
            )
            (
            //y-Achse
            1;
            )
            (
            //z-Achse
            1
            )
        )

But this is only possible if the FF variable is not calculated.
At this time my blockMeshDict file looks like this and it works fine.
But I would prefer to calculate the FF dependent on EE as shown in the commented lines:

     // Grading der Zellen, Ringspalt
    AA 0.5;                  // Anteil Kernbereich
    BB #calc "(1-$AA)/2";    // Bereich Grenzschicht
    CC 0.4;                  // Anteil Zellen Kernbereich
    DD #calc "(1-$CC)/2";    // Anteil Zellen Grenzschicht
    EE 4;                    // Grading Da
    FF 0.25;                  // Grading Di
//    FF #calc "pow ($EE, -1)";        // Grading Di - Berechnen geht nicht
//    FF #calc "1/($EE)";              // Grading Di - Berechnen geht nicht

If I start the meshing with one of the comment lines I get the same Warning as mentioned above (--> FOAM Warning ..... Either correct the patch or split it into planar parts) and paraFoam will close after a short time telling me "Segmentation fault (core dumped)".

So far I have no problem setting one more parameter for FF but I would like to know why this calculation is not working in that intented use. Does anyone have a clue?

Best regards
Michael

[Wowbagger]

Moved this question to the better suited site:
Mesh defining with parameters


Please delete if desired.


Best regards
Michael