|
[Sponsors] |
![]() |
![]() |
#1 |
Guest
Posts: n/a
|
Hi!
I have a very simple mesh in gambit (2D, about 5000 tri cells, only 10 cells with an equiSize Skew higer than 0.22). Now, exporting to and importing in Fluent is no problem. Performing a grid check is ok as well. Now, I turned the solver to axissymmetric and activate k-epsilon modell. After that, a new grid chek failed: WARNING: non-positive volumes exist. Waht happend??? ANY idea?? Ralf |
|
![]() |
![]() |
![]() |
#2 |
Guest
Posts: n/a
|
check if your revolution axis is absolute coincident with your x-axis
|
|
![]() |
![]() |
![]() |
#3 |
Guest
Posts: n/a
|
and it should be only in positive direction on both axis.
|
|
![]() |
![]() |
![]() |
#4 |
Guest
Posts: n/a
|
Hi, thx for answer...
that might be the problem, but: First, I had the axis BC parallel to the y-axis, now it is coincident to the x-axis. But the problem still appears when i turn on the axis-symmetric solver. Ralf |
|
![]() |
![]() |
![]() |
#5 |
Guest
Posts: n/a
|
it is, but that doen't help...
|
|
![]() |
![]() |
![]() |
#6 |
Guest
Posts: n/a
|
check if the revolution axis lie exactly on the x-axis. a small gap about 1e-3 under the x-axis will crash the grid check
|
|
![]() |
![]() |
![]() |
#7 |
Guest
Posts: n/a
|
Hi!
in the domain extents it is visible: the y domain starts from -1.2 e-14 - so there are some nodes below the x-axis!! I solved the problem - editing the msh file: exchanging all y values below 0 to 0. Another way: translating the whole mesh in y-direction. It works fine now... but why does fluent (or gambit) produces that problem??? Ralf |
|
![]() |
![]() |
![]() |
#8 |
Guest
Posts: n/a
|
hey have you checked right handed ness or left handed ness problem
|
|
![]() |
![]() |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
[ICEM] surface mesh merging problem | everest | ANSYS Meshing & Geometry | 44 | April 14, 2016 06:41 |
[ICEM] Using a hybrid mesh for a simple pipe | Udio_NT | ANSYS Meshing & Geometry | 17 | October 18, 2012 14:42 |
[GAMBIT] Error on simple mesh | Rich1979 | ANSYS Meshing & Geometry | 3 | August 16, 2010 05:21 |
[snappyHexMesh] external flow with snappyHexMesh | chelvistero | OpenFOAM Meshing & Mesh Conversion | 11 | January 15, 2010 19:43 |
Icemcfd 11: Loss of mesh from surface mesh option? | Joe | CFX | 2 | March 26, 2007 18:10 |