I modified cavity sample a little by narrowing its moving lid.
The mesh was created successfully. But blockMesh exited with floating point exception for a few runs.
the Courant Number has increased far > 1, and the U field has become saturated in the box.
I also changed the dimension to 3D by moving the faces in frontAndBack to fixedWalls. It seemed to me nothing evolved after the initial set-up.
the information you provide is very little. Therefore it would help if you could post at least:
- log of the creation of blockMesh / error message (?)
- results of checkMesh
and since you mentioned your courant number explodes:
- log of the calculation process (error message)
Assuming that all solver/BC settings are set right this should bring us to
Few comments on what you've got so far:
but you used it and then the calculation crashed?
mesh, it might be that you also have to add some more cells in
the direction where you've got so far just 1 cell layer.
Finally you mentioned that Co and U explode:
since deltT (if you use the standart settings of the controlDict)
and deltX are fixed and U explodes this might be more an BC issue than a
I hope I could contribute
Thank you Colin for your reply.
I think theCourant number overflow problem is related to mesh size. The mesh at one corner of triangle is very small generated by blockMesh with default settings. How can I create triangle mesh? I searched in the forum to find someone mentioned it without solution.
I will add more cells in the box to try to work 3D. But it is unclear to me why one box is sufficient for 2D while not for 3D.
wedge in stead of hex in blockMesh
If you mean tetrahedra cells, there are no native OF meshers which could
do that, but Salome and enGrid can create them.
Again: a little bit more detailed description of your problem could help us
to help you more easy.
Including some pictures/sketches could clarify a matter pretty fast
as well as some output form some log files.
For more questions on that see the sticky post in the main OF Forum!
Thank you Colin,
It turns out I use gmsh to generate mesh.
From your post, I will guess that we need wedge shaped blocks to make triangle mesh possible. Right?
I also mention in another post
that my mesh by gmsh cant pass checkMesh.
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