Mesh cells growing too large

bhperfect · October 10, 2016, 17:58

I'm trying to run a simple Poiseuille flow simulation, and running into issues with the mesher. No matter what size I choose for the Base Size, I'm ending up with cells in the middle of the pipe that are ~10% of the pipe diameter. Is there some way I can tell STAR-CCM+ to not, under any circumstances, create a mesh cell with a dimension larger than a given value?

fluid23 · October 12, 2016, 17:21

What mesher are you using?

bhperfect · October 12, 2016, 17:55

It's a 2D application- I've tried triangles, rectangles, and polyhedral, all with similar results.

fluid23 · October 13, 2016, 09:27

Well... for trimmed mesh (rectangle) you can specify maximum cell size.
for polyhedral mesh you can specify volume growth rate.

Check out the help documentation under:

User Guide > Meshers > Volume Meshers > Volume Mesh Control and Values

cwl · October 24, 2016, 23:11

Decrease "Surface Growth Rate" or try any other "... Growth Rate" in Mesher "Default Controls"

rayjanghyun · October 27, 2016, 20:52

can u just check the global mesh size and specific region mesh size together

October 10, 2016, 17:58	Mesh cells growing too large	#1
bhperfect New Member Brad Perfect Join Date: Jan 2014 Posts: 8 Rep Power: 12	I'm trying to run a simple Poiseuille flow simulation, and running into issues with the mesher. No matter what size I choose for the Base Size, I'm ending up with cells in the middle of the pipe that are ~10% of the pipe diameter. Is there some way I can tell STAR-CCM+ to not, under any circumstances, create a mesh cell with a dimension larger than a given value?

October 27, 2016, 20:52	check	#6
rayjanghyun New Member RayJang Join Date: Jun 2014 Posts: 2 Rep Power: 0	can u just check the global mesh size and specific region mesh size together

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[snappyHexMesh] SnappyHexMesh no layers and no decent mesh for complex geometry	pizzaspinate	OpenFOAM Meshing & Mesh Conversion	1	February 25, 2015 07:05
snappyhexmesh remove blockmesh geometry	philipp1	OpenFOAM Running, Solving & CFD	2	December 12, 2014 10:58
[snappyHexMesh] snappyHexMesh & Mesh around a missile	sasanghomi	OpenFOAM Meshing & Mesh Conversion	2	October 15, 2014 19:54
[snappyHexMesh] external flow with snappyHexMesh	chelvistero	OpenFOAM Meshing & Mesh Conversion	11	January 15, 2010 19:43
How to control Minximum mesh space?	hung	FLUENT	7	April 18, 2005 09:38

October 12, 2016, 17:21		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	What mesher are you using?

October 12, 2016, 17:55		#3
bhperfect New Member Brad Perfect Join Date: Jan 2014 Posts: 8 Rep Power: 12	It's a 2D application- I've tried triangles, rectangles, and polyhedral, all with similar results.

October 13, 2016, 09:27		#4
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	Well... for trimmed mesh (rectangle) you can specify maximum cell size. for polyhedral mesh you can specify volume growth rate. Check out the help documentation under: User Guide > Meshers > Volume Meshers > Volume Mesh Control and Values

October 24, 2016, 23:11		#5
cwl Senior Member Chaotic Water Join Date: Jul 2012 Location: Elgrin Fau Posts: 436 Rep Power: 17	Decrease "Surface Growth Rate" or try any other "... Growth Rate" in Mesher "Default Controls"