Meshing problem

derz · November 24, 2010, 23:11

http://www.flickr.com/photos/derz/5205319511/

See this picture? Notice in the middle of these regions, the mesh is coarser in the middle. How can I eliminate this? I would like the mesh to be as fine as it is at the region-boundaries, all the way through the region...

Any thoughts? I've tried playing around with many options but can't seem to eliminate it with automatic/tets meshing...

Max Efficiency · November 25, 2010, 06:51

On the left side in the settings look at sizing: When you decrease the Max Tet Size you force Meshing to use smaller (and more) elements to mesh your geometry.

Also try changing the growth rate. To achieve a slower growth in element size choose values close to 1 (e.g. 1.05).

akhokhay · November 25, 2010, 09:47

Quote:

Originally Posted by Max Efficiency

On the left side in the settings look at sizing: When you decrease the Max Tet Size you force Meshing to use smaller (and more) elements to mesh your geometry.

Also try changing the growth rate. To achieve a slower growth in element size choose values close to 1 (e.g. 1.05).

this
I also think u set growing rate wrong.
u should inverse it or if boundaries are important use double method(it got different names, iirc in gambit it is bell method!) which get 2 values for each end!

akhenathon · November 30, 2010, 14:20

its a sizing ans infilation problem

Darren Leong · December 2, 2010, 22:50

Hi Derz,

1. You'll have more control by editing through CFX-mesh. Reduce the body spacing from there when meshing. There doesn't seem to be an inflation layer around your model, may have problem with the turbulence models later on.

2. You can extend the inner domain to capture the wake area and have the coarser mesh as your outer domain. This eliminates errors at the domain interfaces (lost of flow information). The outer domain should be bigger to reduce the chance of blockage effect.

November 24, 2010, 23:11	Meshing problem	#1
derz Member Derwin Parkin Join Date: Feb 2010 Posts: 35 Rep Power: 16	http://www.flickr.com/photos/derz/5205319511/ See this picture? Notice in the middle of these regions, the mesh is coarser in the middle. How can I eliminate this? I would like the mesh to be as fine as it is at the region-boundaries, all the way through the region... Any thoughts? I've tried playing around with many options but can't seem to eliminate it with automatic/tets meshing...

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November 25, 2010, 06:51		#2
Max Efficiency New Member Join Date: May 2010 Posts: 24 Rep Power: 16	On the left side in the settings look at sizing: When you decrease the Max Tet Size you force Meshing to use smaller (and more) elements to mesh your geometry. Also try changing the growth rate. To achieve a slower growth in element size choose values close to 1 (e.g. 1.05).

November 30, 2010, 14:20		#4
akhenathon New Member Join Date: Nov 2010 Posts: 9 Rep Power: 16	its a sizing ans infilation problem

December 2, 2010, 22:50		#5
Darren Leong Member Darren Leong Join Date: Dec 2010 Posts: 64 Rep Power: 16	Hi Derz, 1. You'll have more control by editing through CFX-mesh. Reduce the body spacing from there when meshing. There doesn't seem to be an inflation layer around your model, may have problem with the turbulence models later on. 2. You can extend the inner domain to capture the wake area and have the coarser mesh as your outer domain. This eliminates errors at the domain interfaces (lost of flow information). The outer domain should be bigger to reduce the chance of blockage effect.