CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > ANSYS Meshing & Geometry

[ICEM] 3D Dynamic Mesh - Boundary layer mesh issues

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

LinkBack Thread Tools Search this Thread Display Modes
Old   September 23, 2015, 05:14
Default 3D Dynamic Mesh - Boundary layer mesh issues
New Member
Nathan Ricks
Join Date: Aug 2015
Posts: 10
Rep Power: 10
nathanricks is on a distinguished road
Hello, I’m just wondering if someone is able to help me in regards to 3D dynamic mesh in Fluent 15.0, with the mesh created in ICEM CFD. The general geometry is of a throat/lung system, so not simple cylinders, etc.

I’ve written a UDF that moves the wall mesh in the desired motion (when tested using “Display Zone Motion” and “Preview Mesh Motion”), however I cannot get the boundary layer cells to move with the wall mesh. In the “Preview Mesh Motion”, the boundary layer cells are stationary, and new cells are created to fill the space between the boundary layer and dynamic wall. Most dynamic mesh examples I have found are in 2D, and do not include a boundary layer that is changing shape. You can see attached one cross section that shows the issue.

I found in the ANSYS manual “11.7.2 Specifying the Motion of Dynamic Zones”, where there is a section discussing “Specifying Boundary Layer Deformation Smoothing”. It states: “Note that the boundary layer has to be a separate fluid zone from the adjacent fluid zone.”

The unstructed mesh was created in ICEM by a previous member of our group that did not plan for dynamic motion, so the fluid zone is a single zone. Is there a way I can separate the boundary layer zone and inside fluid zone in ICEM or fluent without starting the mesh again (the mesh is relatively complex)? The boundary layer consists of prism cells, and the inside fluid zone of tetrahedral cells. I’ve tried to use this fact to create new parts in ICEM, but I am left with uncovered faces that I wasn’t able to repair.

Any insight in how to split the fluid zones, or how I can work with a single fluid zone, would be greatly appreciated!

Thanks in advance,
Kind Regards,

Nathan Ricks
Attached Images
File Type: png deformV6_2.png (36.9 KB, 47 views)
nathanricks is offline   Reply With Quote


boundary layer, dynamic mesh, fluent, uncovered faces, unstructured mesh

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
[ICEM] Hybrid mesh for 2D boundary layer Bigio ANSYS Meshing & Geometry 33 November 18, 2019 09:15
Divide Prismatic Boundary Layer Mesh causes overlapping faces SilentRunner42 enGrid 4 May 4, 2015 03:37
[snappyHexMesh] Boundary layer in a pipe Clementhuon OpenFOAM Meshing & Mesh Conversion 6 March 12, 2012 12:41
[Commercial meshers] Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Meshing & Mesh Conversion 2 July 15, 2005 04:15
errors Fahad Main CFD Forum 0 March 23, 2004 13:20

All times are GMT -4. The time now is 20:51.