|
[Sponsors] |
[snappyHexMesh] Mesh becoming coarser during addLayers in sHM |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
December 13, 2010, 12:49 |
Mesh becoming coarser during addLayers in sHM
|
#1 |
Senior Member
Arne Stahlmann
Join Date: Nov 2009
Location: Hanover, Germany
Posts: 209
Rep Power: 18 |
Hi,
I set up a test case for testing snappyHexMesh and especially the layer addition possibility. I noticed that after the addLayers process, the surface mesh of my structure has become coarser, i.e. points and edges from the fine surface mesh (time 0.06) seem to have been used for the layer creation (time 0.09, vertical edges). Interestingly, this only happens on the cylinder part, not on the box part. How can I stop this, as it is destroying my mesh in certain locations of the 'real' structure? Pictures. left: after snapping procedure 0.06 right: after addLayers procedure 0.09. The sHM dict is attached. |
|
December 14, 2010, 04:04 |
|
#2 |
Senior Member
Arne Stahlmann
Join Date: Nov 2009
Location: Hanover, Germany
Posts: 209
Rep Power: 18 |
Ok, let's ask another question: Is this a 'normal' behaviour of sHM, i.e. does this happen in a similar way in your cases, or not?
|
|
January 21, 2011, 09:17 |
|
#3 |
Member
Jim Knopf
Join Date: Dec 2010
Posts: 60
Rep Power: 16 |
Do you have some pictures? I'm not sure about the phenomena you're describing
THX jim |
|
February 22, 2011, 07:44 |
|
#4 |
New Member
Shankar
Join Date: Jun 2009
Location: India
Posts: 9
Rep Power: 17 |
Hello Arnoldinho,
Your observation is right, i too have seen this strange behavior while generating boundary layer padding. As of know i am also not aware of the real reason. |
|
April 6, 2011, 13:20 |
|
#5 |
Senior Member
Eugene de Villiers
Join Date: Mar 2009
Posts: 725
Rep Power: 21 |
The volume mesh isn't getting coarser. You are just observing a surface effect. Before the layers are added, SHM tries to merge all boundary faces in a cell that are close to co-planar to improve quality and reduce the number of added layer cells. The "coarsening" you are seeing on the cylinder is just this. Make a cutting plane normal to the cylinder and you will see. The reason you don't observe this on the box is because there much fewer same-cell co-planar faces on a coordinate aligned box.
|
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
how to set periodic boundary conditions | Ganesh | FLUENT | 15 | November 18, 2020 07:09 |
decomposePar problem: Cell 0contains face labels out of range | vaina74 | OpenFOAM Pre-Processing | 37 | July 20, 2020 06:38 |
[snappyHexMesh] Snappyhex mesh: poor inlet mesh | Swagga5aur | OpenFOAM Meshing & Mesh Conversion | 1 | December 3, 2016 17:59 |
[snappyHexMesh] SHM not snapping to some surfaces | Swift | OpenFOAM Meshing & Mesh Conversion | 13 | January 4, 2016 02:56 |
engrid: Internal volume mesh becoming coarser during boundayr layer addition | Arnoldinho | OpenFOAM | 1 | January 22, 2011 05:31 |