CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > ANSYS Meshing & Geometry

[ANSYS Meshing] remeshing in Ansys CFX - help or tutorials needed

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

Like Tree1Likes
  • 1 Post By adeban

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 30, 2011, 12:46
Default remeshing in Ansys CFX - help or tutorials needed
  #1
Member
 
anonymous
Join Date: Jun 2011
Posts: 58
Rep Power: 14
Doginal is on a distinguished road
Hello All

I am currently trying to model a plate moving along a specified path in order to measure lift and drag forces/coefficients as it moves. I am doing this using Ansys CFX and specifying a moving mesh of a cylindrical subdomain which contains the plate. I use the cylindrical subdomain so that the mesh within that domain does not deform, instead only mesh in the outer domain deforms where the flow is not significant.

My issue is in the outer domain, the mesh deformation very highly skewed element and eventually negative elements which causes the simulation to crash.

I would like to use a remeshing controller during the simulation to remesh the outer domain while leaving the inside domain as is however I can not find any good tutorials explain how to do this. I have a very little bit of experience with ICEM MESH so if i need to use that, that is okay but i'd much rather use the CFX meshing to do this.

If anyone has any experience with using a User Defined remesh parameter can you please help guide me on how to set this up or could anyone point towards some good tutorials explaining how to do this.

Thank You,

DM
Doginal is offline   Reply With Quote

Old   September 1, 2011, 14:42
Default
  #2
Senior Member
 
Bruno
Join Date: Mar 2009
Location: Brazil
Posts: 277
Rep Power: 21
brunoc is on a distinguished road
Hi Doginal,

I believe ANSYS has some examples on that, using either ICEM CFD or ANSYS Meshing as the remesher. You should contact your ANSYS representative and ask for these examples.

Cheers.
brunoc is offline   Reply With Quote

Old   September 1, 2011, 19:26
Default
  #3
Member
 
anonymous
Join Date: Jun 2011
Posts: 58
Rep Power: 14
Doginal is on a distinguished road
Quote:
Originally Posted by brunoc View Post
Hi Doginal,

I believe ANSYS has some examples on that, using either ICEM CFD or ANSYS Meshing as the remesher. You should contact your ANSYS representative and ask for these examples.

Cheers.
Thank you for your reply. I'm in the process of trying to get in touch with Ansys Support but i'm waiting to try to get an account set up first.

I have a couple of random questions.
Is it possible to combine a mesh from ICEM CFD with CFX-Mesher. If it is possible, I would like to mesh an outer domain with ICEM CFD and an inner subdomain with Ansys CFX.
From there I would remesh only the outer domain and leave the inner sub domain constant as the inner domain does not deform at all.

Hopefully that makes sense.

Thank You,

DM
Doginal is offline   Reply With Quote

Old   September 1, 2011, 22:30
Default
  #4
Senior Member
 
Bruno
Join Date: Mar 2009
Location: Brazil
Posts: 277
Rep Power: 21
brunoc is on a distinguished road
There are two different answers to your question.

If you're working in ANSYS Meshing then yes, it's possible. Inside ANSYS Meshing you can generate an ICEM Tetra mesh in one body and any other meshing method on the other body. The resulting complete mesh will be conformal at the interface.

If you work on ICEM "standalone" (ie, not through Workbench) then it is still possible, but you won't get a conformal mesh at the interface. However that is not a problem for CFX. You can just set a domain interface and follow through with that option. Just be careful to set similar mesh sizes at the interfaces so that you get approximately the same number of nodes on each side.

That's about it.
brunoc is offline   Reply With Quote

Old   September 1, 2011, 22:35
Default
  #5
Senior Member
 
Bruno
Join Date: Mar 2009
Location: Brazil
Posts: 277
Rep Power: 21
brunoc is on a distinguished road
I just read your first question again, and it came to me that remeshing is not needed on your case. If your mesh displacement is known beforehand, than you can just do a "dry run" to check at which timesteps your mesh becomes unacceptable. At that point you should generate a new mesh and restart your simulation using it. You can even use CFX's multiconfiguration feature to do the mesh switching automatically.
brunoc is offline   Reply With Quote

Old   September 13, 2011, 07:47
Default
  #6
New Member
 
Klas Johansson
Join Date: Mar 2009
Posts: 16
Rep Power: 17
adeban is on a distinguished road
Hi,

I did the following tutorial a year ago explaining how to do this in CFX using ICEM.

http://www.edr.no/blogg/ansys_blogge...cfx_re_meshing


Klas Johansson, Ph.D.
Technical Consultant


EDR | Engineering Data Resources AB |
+46 31 759 5035 (tel) | +46 (0)708 87 92 72 (mobile)
mailto:klas.johansson@edr.se

EDR blog http://www.edr.se/blogg

Newsletter http://www.edr.se/nyhetsbrev
cloud7a likes this.
adeban is offline   Reply With Quote

Old   September 24, 2014, 10:43
Default
  #7
New Member
 
Gwen Yang
Join Date: Sep 2014
Posts: 13
Rep Power: 11
gwen520 is on a distinguished road
Quote:
Originally Posted by adeban View Post
Hi,

I did the following tutorial a year ago explaining how to do this in CFX using ICEM.

http://www.edr.no/blogg/ansys_blogge...cfx_re_meshing


Klas Johansson, Ph.D.
Technical Consultant

EDR | Engineering Data Resources AB |
+46 31 759 5035 (tel) | +46 (0)708 87 92 72 (mobile)
mailto:klas.johansson@edr.se

EDR blog http://www.edr.se/blogg

Newsletter http://www.edr.se/nyhetsbrev
hello, adeban, after remesh, my box always get back to the initial position! I don't know why? please offer me some help
gwen520 is offline   Reply With Quote

Reply

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
ANSYS CFX with Remeshing in ICEM CFD adeban CFX 21 March 29, 2021 07:06
Setting Pressure Boundary Conditions in ANSYS CFX Pre saisanthoshm88 CFX 21 February 22, 2017 17:50
Calculation of the Governing Equations Mihail CFX 7 September 7, 2014 07:27
ANSYS Multi-physics and CFX coupling error anujit CFX 3 June 21, 2009 19:39
I cannot open Ansys CFX in Workbench Pham Son Minh CFX 2 January 13, 2008 04:33


All times are GMT -4. The time now is 12:13.