|
[Sponsors] |
June 28, 2012, 07:40 |
Mesh Expansion Factor- Acceptable range
|
#1 |
Senior Member
---------
Join Date: Oct 2010
Posts: 303
Rep Power: 17 |
Could some one please let me know the acceptable range of mesh expansion factor in CFX.
I found many threads related to this on cfd-online but none of them seem to suggest the acceptable range. I have a maximum mesh expansion factor of 146 and it is seen with less than 1 % of the elements. It is a hexahedral mesh and i'm using the SST turbulence model
__________________
Best regards, Santhosh. |
|
June 28, 2012, 08:22 |
|
#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
You can't find a general rule for this because there isn't one. Some models are super sensitive to eg (eg surface tension) yet some models are quite accurate despite horrible expansion ratioes (eg low Re flows). And if the elements are aligned with the flow it is much more tolerable than if it is at an angle.
I realise that does not help you much. So the best approach is to try a few different mesh qualities and work it out for your specific model. |
|
June 28, 2012, 23:14 |
HI Glenn
|
#3 |
Senior Member
Danial
Join Date: Nov 2011
Posts: 179
Rep Power: 14 |
I guess in documents it is recommended to be less than 20. But still, depending on model it should be checked accordingly.
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[ICEM] Negative volume error in hybrid mesh | siw | ANSYS Meshing & Geometry | 4 | September 3, 2014 05:25 |
Mesh motion with Translation & Rotation | Doginal | CFX | 2 | January 12, 2014 06:21 |
[snappyHexMesh] non-smooth mesh | Svensson | OpenFOAM Meshing & Mesh Conversion | 11 | January 18, 2012 09:13 |
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! | sc298 | OpenFOAM Meshing & Mesh Conversion | 2 | March 27, 2011 21:11 |
fluent add additional zones for the mesh file | SSL | FLUENT | 2 | January 26, 2008 11:55 |