blockMesh warning negative volume
 

Hi guys,

I try to blockMesh my geometry but I get the following warnings when doing so:

FOAM Warning:
From function cellModel::mag (const labelList&, const pointField&)
in file meshes/meshShapes/cellModel/cellModel.c at line 128
zero or negative pyramid volume: -3.3333e+09 for face 1
FOAM Warning:
From function cellModel::mag (const labelList&, const pointField&)
in file blockMesh/blockMeshTopology.C at line 255
negative volume block: 0, probably defined inside out

What is the reason for this?
Where can I find meshes/meshShapes/cellModel/cellModel.c and blockMesh/blockMeshTopology.C?

Thank you very much in advance for your help

would you share your blockMeshDict?

uuupss, realised my mistake and solved the problem :-)

Negative Valumes in BlockMesh
 

Hii

What was your mistake ?
I'm facing same problem .

Regardss
Maral

Hi Maral,

Check the order in which you have defined your vertices and the way you have called them while defining the hex block.

As an example, assuming that you are creating a cuboid, the way I would define it is to start at the lower z value, from the bottom left point and continue in a anticlockwise way to the top left point. And then do the same for the higher z value.

I have noticed that this way allows you to avoid the inside out problem.

Hope this helps.

Cheers,
Antimony