[H0T_S0UP]

I have finished the tutorial for stress analysis of a square plate with a hole through the center. I am trying to beyond the tutorial and would like to run a case where the mesh is graded near the hole boundary. I have made a few attempted editing the blockMesh but get fatal errors such as:

--> FOAM FATAL ERROR: 
Inconsistent point locations between block pair 0 and 1
    probably due to inconsistent grading.

    From function blockMesh::calcMergeInfo()
    in file blockMesh/blockMeshMerge.C at line 294.

FOAM exiting

Quite frankly, my gut feeling tells me that an alternative method from editing the blockmeshdict file will have to be implemented. At the very least the mesh wont be uniform and has to be graded in the normal direction to the hole boundary. I am not aware of a way to do this using edgegrading or simplegrading alone. Any advice is appreciated, thanks.

[opedrofunk]

Not sure exactly what you're going for, but you can definitely control the mesh density/gradation at the hole with a few simple edits. You can actually do quite a bit with blockMesh :-)

For example (the original):

blocks
(
    hex (5 4 9 10 16 15 20 21) (10 10 1) simpleGrading (1 1 1)
    hex (0 1 4 5 11 12 15 16) (10 10 1) simpleGrading (1 1 1)
    hex (1 2 3 4 12 13 14 15) (20 10 1) simpleGrading (1 1 1)
    hex (4 3 6 7 15 14 17 18) (20 20 1) simpleGrading (1 1 1)
    hex (9 4 7 8 20 15 18 19) (10 20 1) simpleGrading (1 1 1)
);

Yields:




With changing the density and gradation:

blocks
(
    hex (5 4 9 10 16 15 20 21) (20 20 1) simpleGrading (3 1 1)
    hex (0 1 4 5 11 12 15 16) (20 20 1) simpleGrading (3 1 1)
    hex (1 2 3 4 12 13 14 15) (20 20 1) simpleGrading (3 1 1)
    hex (4 3 6 7 15 14 17 18) (20 20 1) simpleGrading (3 1 1)
    hex (9 4 7 8 20 15 18 19) (20 20 1) simpleGrading (1 1 1)
);

Yields:



Cheers,
Peter

[H0T_S0UP]

Thanks! It worked. So, I thought when defining the expansion ratio that it was in absolute x,y,z coordinates. I am guessing since you only changed the first values adjacent to the hole they are in n-t coordinates?

Also, how come you had to grade blocks 4 and 2 (the blocks above and to the right of the hole), instead of just blocks 0 and 1, which comprise the hole?

[kazzyfitz]

"Also, how come you had to grade blocks 4 and 2 (the blocks above and to the right of the hole), instead of just blocks 0 and 1, which comprise the hole?"

If I'm interpreting your question properly, adjoining block edges mush have the same number of cells and the same grading. Hope that helps.