|Anonymous | Login | Signup for a new account||2014-07-29 04:35 UTC|
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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0001131||OpenFOAM||[All Projects] Bug||public||2014-01-10 20:35||2014-01-24 09:01|
|Status||resolved||Resolution||no change required|
|Target Version||Fixed in Version||2.2.x|
|Summary||0001131: Wrong surface normals with snappyHexMesh's baffle feature on varying blockMeshDict description|
|Description||I understand that this problem was observed and resolved here http://www.openfoam.org/mantisbt/view.php?id=772 [^] but there is are situations when this problem resurfaces. One such situation is varying the blockMeshDict file. I notice an error in the orientation of the surface normals (hence Displacements and Stresses) if my blockMesh deviates from the following box dimensions (-100,-50,-50) by (100,50,50) with (50,25,25) blocks in the respective directions. The baffle I am creating using SHM is a circular surface with center at (0,0,0) and radius as 5 in the yz plane. The two deviations that don't work that I have tested so far are |
1. box dims = (-100,-50,-50) by (200,50,50), #blocks = (75,25,25)
2. box dims = (-100,-50,-50) by (300,50,50), #blocks = (100,25,25)
As you can see the aspect ratio is 1:1:1 in all the cases.
I am using soildDisplacementFoam. The case calculates the stresses around an open fracture by applying equal and opposite tractionDisplacement boundary conditions on the two faces of the baffle.
|Steps To Reproduce||Run attached case.|
Vary blockMeshDict and run case again.
|Tags||baffle, snappyHexMesh, surface normal|
|Attached Files|| frac1.zip [^] (757,315 bytes) 2014-01-10 20:35|
200x100x100_50x25x25.png [^] (221,258 bytes) 2014-01-10 20:36
300x100x100_75x25x25.png [^] (249,808 bytes) 2014-01-10 20:36
400x100x100_100x25x25.png [^] (267,570 bytes) 2014-01-10 20:37
Sneddon_50_25_25.tar.gz [^] (7,783 bytes) 2014-01-20 21:59
Sneddon_100_25_25.tar.gz [^] (7,734 bytes) 2014-01-20 21:59
File 200x100x100_50x25x25 shows the correct displacement profile. This was obtained by using a blockmesh dimensions (-100,-50,-50) by (100,50,50) with (50,25,25) blocks in the respective directions. The circle you see in the figure is a baffle with equal and opposite traction displacement pressure on the two faces hence creating a uniform displacement profile.
File 300x100x100_75x25x25 and File 400x100x100_100x25x25 show the incorrect displacement profiles. As you see there are specific blocks in these two grids where the displacement is varying between the extreme +ve and -ve values randomly.
In all cases the circular disk fracture is located with center at (0,0,0) and radius of 5 in the YZ plane.
I am running your setup (100x25x25) and the normals are ok.
I am sorry but I am not able to reproduce the result. Can you help me diagnose what is wrong in my case? I have attached the exact cases with this note. Sneddon_50_25_25 is able to identify the normals correctly while Sneddon_100_25_25 is not able to identify the normals on the chosen patch correctly. The patches I am interested in are ff and ff_slave. Running the Allrun file in both cases should be enough to generate results.
Thanks for your help.
All works fine for me in 22x. Normals are correctly oriented (ff points in +x direction, ff_slave in -x direction). Normals are correctly preserved in renumberMesh.
Are you running an uptodate 22x?
|Thanks Mattijs. I am running a binary version of of222. I will install the latest version from a source pack and see if I can figure this out. Thanks for all your help. I will respond back in a couple of days and let you know if updating helped.|
|The problem was fixed by installing an uptodate version of 22x from the Openfoam repository. Thanks for your help!|
|2014-01-10 20:35||ripudaman||New Issue|
|2014-01-10 20:35||ripudaman||File Added: frac1.zip|
|2014-01-10 20:36||ripudaman||File Added: 200x100x100_50x25x25.png|
|2014-01-10 20:36||ripudaman||File Added: 300x100x100_75x25x25.png|
|2014-01-10 20:37||ripudaman||File Added: 400x100x100_100x25x25.png|
|2014-01-10 20:38||ripudaman||Tag Attached: snappyHexMesh|
|2014-01-10 20:38||ripudaman||Tag Attached: baffle|
|2014-01-10 20:38||ripudaman||Tag Attached: surface normal|
|2014-01-10 20:43||ripudaman||Note Added: 0002759|
|2014-01-20 09:23||mattijs||Note Added: 0002764|
|2014-01-20 21:59||ripudaman||Note Added: 0002765|
|2014-01-20 21:59||ripudaman||File Added: Sneddon_50_25_25.tar.gz|
|2014-01-20 21:59||ripudaman||File Added: Sneddon_100_25_25.tar.gz|
|2014-01-21 09:06||mattijs||Note Added: 0002766|
|2014-01-21 18:14||ripudaman||Note Added: 0002770|
|2014-01-24 05:07||ripudaman||Note Added: 0002781|
|2014-01-24 09:01||mattijs||Status||new => resolved|
|2014-01-24 09:01||mattijs||Fixed in Version||=> 2.2.x|
|2014-01-24 09:01||mattijs||Resolution||open => no change required|
|2014-01-24 09:01||mattijs||Assigned To||=> mattijs|