CFD Online Logo CFD Online URL
Home > Forums > CD-adapco

Star CCM Overset Mesh Error (Rotating Turbine)

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

LinkBack Thread Tools Display Modes
Old   March 7, 2013, 13:42
Default Star CCM Overset Mesh Error (Rotating Turbine)
New Member
Zack Hoyle
Join Date: Mar 2013
Posts: 18
Rep Power: 5
thezack is on a distinguished road
Hi, I am having an error in my simulations that I cannot seem to fix. I have a turbine (DFBI 1 axis rotation) rotating inside of another larger mesh. The purpose of the simulation is to simulate a gravitational vortex turbine (water enters from the top of a funnel and swirls down the funnel creating a vortex, and a turbine is placed at the bottom to rotate a shaft). The simulation is 3D. Mesh 1 is the polyhedral mesh of the funnel volume, and mesh 2 is the overset mesh of the turbine completely enclosed within mesh 1. Both are polyhedral mesh, mesh 2 has prism layer mesher, surface remesher, and surface wrapping meshing models. Mesh 1 has polyhedral, prism layer, and surface remesher.

I keep trying varying levels of mesh size for mesh 1 and mesh 2, and I keep getting this error message:

Updating indirect region interface Overset Mesh 1 between Turbine and SwirlyMarch5NoDamEntrance.
Failed to cut hole in region SwirlyMarch5NoDamEntrance.
This might be due to an overlapping of overset regions or due to invalid mesh configuration!

Am I using the wrong meshing models? Should mesh 1 or mesh 2 be finer? Should they be roughly the same mesh size or should 2 be much finer? I am new to this, and I have no idea how to proceed. I keep messing around with the mesh properties and nothing seems to work. I am not sure if there is something specific I should be changing. The documentation on Star CCM+ has a troubleshooting section, but it does not say how to fix those kinds of errors. Ive tried setting up the scalar overset mesh type scene, but of course it is in 2-D when my simulation is 3-D, so I cannot see where on the mesh the error is. I am pretty stumped here and would greatly appreciate any help. Thanks!
thezack is offline   Reply With Quote

Old   May 14, 2013, 15:08
Ryan Coe
Join Date: Jun 2010
Location: Albuquerque, NM
Posts: 98
Rep Power: 8
ryancoe is on a distinguished road

The overset mesh can be challenging to configure. I've had some luck using a series of plane sections with the Overset Scalars to try to find the locations where you're having problems. Its a bit unwieldy, but its the best thing I've found thus far.

If that doesn't help, I would try to simplify the geometry to make it more overset-friendly until you get it working, and then work back to full fidelity.
ryancoe is offline   Reply With Quote

Old   September 27, 2013, 07:58
Join Date: Jan 2012
Posts: 32
Rep Power: 6
hyderkhan74 is on a distinguished road
I have the same problem so i wonder how you solve it ?
thanks in advance
hyderkhan74 is offline   Reply With Quote

Old   December 11, 2013, 04:09
New Member
Join Date: Nov 2010
Posts: 9
Rep Power: 7
ayannath23 is on a distinguished road
Hi Zack,
I think the error is due to improper mesh..
Please go through the tutorial in star ccm+ help (Tutorial Guide > Motion > DFBI: Lifeboat with Overset Mesh). It explains nicely about the meshing requirements.

ayannath23 is offline   Reply With Quote

Old   April 26, 2016, 02:03
Default Problem Solved
New Member
Kushal Kumar
Join Date: Apr 2016
Posts: 1
Rep Power: 0
Kush7876 is on a distinguished road
Proper meshing would solve this problem, you should make sure that there should at least 3 cells of overset mesh are there on 1 cell of background mesh and also you should maintain the same through out the path in which overset mesh is travelling.

Further please refer to "best practices for overset mesh" in star user guide
Kush7876 is offline   Reply With Quote


Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
No layers in a small gap bobburnquist OpenFOAM Native Meshers: snappyHexMesh and Others 6 August 26, 2015 09:38
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Overset mesh error Caterpillar85 STAR-CCM+ 2 February 12, 2013 06:54
Can I use Turbogrid to mesh a wind turbine blade? Henry Liu CFX 10 November 10, 2011 06:41
Turbogrid Shroud-Hub Mesh Measure Limits. Turbine Santiago Orrego. CFX 0 July 27, 2007 13:30

All times are GMT -4. The time now is 22:07.