[GAMBIT] How to refine a mesh in a 3D cylinder

kbylll · March 30, 2012, 20:15

Hello

How to refine my volume mesh into a cylinder ?

sarangdalne · March 30, 2012, 22:46

Can you give bit more detail as to what you are trying to do?
Thanks,
Sarang

kbylll · March 31, 2012, 02:55

I have a pipe with a valve, and I would like to refine my mesh at the entrance and exit of the pipe and valve to gain more precision and computation time.

banty · March 31, 2012, 08:06

before meshing the hole pipe and valve (Volume meshing), first u place more no of grid point on the edges near the entrance and exit and then mesh the volume.

PSYMN · March 31, 2012, 11:05

If you are trying to refine the volume, you need to create a density box... This is one of the options under the mesh tab. If you create a density region from 2 points, it will create a cylinder. The radius of the cylinder is the mesh size you set times the width (number of elements of that size)...

Basically, a density box or density region is a way to locally control the max size in a volumetric region defined by points or entities.

It only works with tetrahedral meshes and surface meshes created from them (such as patch independent octree surface mesh).

PSYMN · March 31, 2012, 11:06

oops, sorry, you were asking about gambit. Ignore the last response, it was for ICEM CFD.

kbylll · March 31, 2012, 12:32

Quote:

Originally Posted by banty

before meshing the hole pipe and valve (Volume meshing), first u place more no of grid point on the edges near the entrance and exit and then mesh the volume.

It doesn't work.

if we take only one cylinder, how to refine the mesh at the entrance?

For your information, I create the cylinder and I draw a line between two points located on the faces of the input and output, then I refine my line and mesh them after i mesh my volume, but it doesn't work.

kbylll · March 31, 2012, 12:33

Quote:

Originally Posted by PSYMN

oops, sorry, you were asking about gambit. Ignore the last response, it was for ICEM CFD.

no problem, it happens. Thank you even when it's the thought that counts.

banty · March 31, 2012, 15:15

hopefully it will help u.plz see section Specifying the Grading Scheme
http://202.118.250.111:8080/fluent/G...ide/mg0302.htm

kbylll · April 1, 2012, 09:00

Thank you, I found the solution.
Just refine the surface mesh of the pipe and also to refine the mesh of a plane that intersects the cylinder 2 and the end must be the volume mesh.

-mAx- · April 2, 2012, 01:18

use size functions...
http://my.fit.edu/itresources/manual...ommands_create

kbylll · April 20, 2012, 19:54

Thank you for your answers, they were very helpful to me.
Banty thank you, your answer was the solution for me.

March 30, 2012, 20:15	How to refine a mesh in a 3D cylinder	#1
kbylll New Member Aziz Join Date: Mar 2012 Posts: 6 Rep Power: 14	Hello How to refine my volume mesh into a cylinder ?

March 31, 2012, 11:05		#5
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	If you are trying to refine the volume, you need to create a density box... This is one of the options under the mesh tab. If you create a density region from 2 points, it will create a cylinder. The radius of the cylinder is the mesh size you set times the width (number of elements of that size)... Basically, a density box or density region is a way to locally control the max size in a volumetric region defined by points or entities. It only works with tetrahedral meshes and surface meshes created from them (such as patch independent octree surface mesh). __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

March 31, 2012, 11:06		#6
PSYMN Senior Member Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,663 Blog Entries: 1 Rep Power: 47	oops, sorry, you were asking about gambit. Ignore the last response, it was for ICEM CFD. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

April 2, 2012, 01:18		#11
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	use size functions... http://my.fit.edu/itresources/manual...ommands_create __________________ In memory of my friend Hervé: CFD engineer & freerider

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[snappyHexMesh] SnappHexMesh Mesh creating a Mesh inside a Cylinder?	abu	OpenFOAM Meshing & Mesh Conversion	1	April 4, 2017 09:57
Gambit mesh for cylinder	Kavia	FLUENT	16	September 26, 2013 00:34
[ICEM] Generating Mesh for STL Car in Windtunnel Simulation	tommymoose	ANSYS Meshing & Geometry	48	April 15, 2013 04:24
[ICEM] Unstructure Meshing Around Imported Plot3D Structured Mesh ICEM	kawamatt2	ANSYS Meshing & Geometry	17	December 20, 2011 11:45
Icemcfd 11: Loss of mesh from surface mesh option?	Joe	CFX	2	March 26, 2007 18:10

March 30, 2012, 22:46		#2
sarangdalne New Member Sarang Dalne Join Date: Oct 2010 Posts: 28 Rep Power: 15	Can you give bit more detail as to what you are trying to do? Thanks, Sarang

March 31, 2012, 02:55		#3
kbylll New Member Aziz Join Date: Mar 2012 Posts: 6 Rep Power: 14	I have a pipe with a valve, and I would like to refine my mesh at the entrance and exit of the pipe and valve to gain more precision and computation time.

March 31, 2012, 08:06		#4
banty Member banty Join Date: Mar 2012 Posts: 52 Rep Power: 14	before meshing the hole pipe and valve (Volume meshing), first u place more no of grid point on the edges near the entrance and exit and then mesh the volume.

March 31, 2012, 15:15		#9
banty Member banty Join Date: Mar 2012 Posts: 52 Rep Power: 14	hopefully it will help u.plz see section Specifying the Grading Scheme http://202.118.250.111:8080/fluent/G...ide/mg0302.htm

April 1, 2012, 09:00		#10
kbylll New Member Aziz Join Date: Mar 2012 Posts: 6 Rep Power: 14	Thank you, I found the solution. Just refine the surface mesh of the pipe and also to refine the mesh of a plane that intersects the cylinder 2 and the end must be the volume mesh.

April 20, 2012, 19:54		#12
kbylll New Member Aziz Join Date: Mar 2012 Posts: 6 Rep Power: 14	Thank you for your answers, they were very helpful to me. Banty thank you, your answer was the solution for me.