CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

Left-handed faces occur when moving a mesh

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   March 19, 2014, 06:34
Question Left-handed faces occur when moving a mesh
New Member
Join Date: Mar 2014
Posts: 3
Rep Power: 12
Morelz is on a distinguished road

my case in simple but i cannot send pictures of it, so i have to describe what i'm working on;

Im working on a 3D moving furnace grate to burn biomass.
I have only one step of that grate, translating discontinuously forward and backward only X axis, that compresses the mesh in front of it while enlarging the one behind. so its something similar to the piston of a 2 stroke engine (but the face is squared and not cylindrical)

Im working with FLUENT 15 on a DYNAMIC MESH moved by a UDF (DEF_CG_MOTION) with LAYERING feature (ratio based 0.4 / 0.4), since the cells are hexaedral.

The quality of the mesh is good, despite few cells (> 0.01 %) with high skewness or low quality ratio.

THE PROBLEM IS: during the PREVIEW of the mesh movement, after 2 movement of the step (30sec), appears the warning "left-handed faces detected". If i ignore it the simulation runs until 98 sec, then NEGATIVE VOLUME error appears and blocks everything.

I tried with a lot of different brief timesteps but there isnt influence, since the speed is very low and cells are quite big (1cm)

I tried whit the "mesh repairing tools" but, despite sometime it works (and im also able to check the mesh) the negative volume is detected as well at 98sec.

I DON`T have any problem in using the "DISPLAY MESH MOVEMENT"

Someone has encountered a similar problem or can advice me on how proceed to discover new info about this error?

I thank you all!
Morelz is offline   Reply With Quote

Old   April 17, 2014, 18:41
Senior Member
Join Date: Jan 2010
Posts: 110
Rep Power: 16
ndabir is on a distinguished road
I have the same problem exactly! Have you solved it?
ndabir is offline   Reply With Quote


left-handed, reversed faces.

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[Commercial meshers] Mesh conversion problem (fluent3DMeshToFoam) Aadhavan OpenFOAM Meshing & Mesh Conversion 2 March 8, 2018 01:47
[snappyHexMesh] SnappyHexMesh for internal Flow vishwa OpenFOAM Meshing & Mesh Conversion 24 June 27, 2016 08:54
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
[snappyHexMesh] external flow with snappyHexMesh chelvistero OpenFOAM Meshing & Mesh Conversion 11 January 15, 2010 19:43
[blockMesh] BlockMeshmergePatchPairs hjasak OpenFOAM Meshing & Mesh Conversion 11 August 15, 2008 07:36

All times are GMT -4. The time now is 03:45.