CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Mesh Coordinates

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 7, 2007, 12:43
Default Mesh Coordinates
  #1
Khaled & Noel
Guest
 
Posts: n/a
Dear CFX users,

Is it possible to pick the x,y, and z coordinates of a specific domain in CFX-Pre through CEL expressions? Also, does anyone know the syntax to be used in order to pass the coordinates of surface nodes for a specific domain using CFX Data Acquisition Routines?

Thanks.
  Reply With Quote

Old   May 7, 2007, 14:40
Default Re: Mesh Coordinates
  #2
opaque
Guest
 
Posts: n/a
Dear Khaled & Noel,

What do you mean by pick?

You can use x, y, and z as CEL variables in any expression in CFX-Pre, CFX-Solver and CFX-Post..

What do you mean by passing the coordinates usign CFX Data Ac..routines?

You want to get XYZ for boundary nodes, and work with them? Then, you must call USER_MESH_GETDATA using the documented interface, and you will get a pointer to the array containing the coordinates of the nodes on a particular surface..

Have you read the CEL, and/or User Fortran documentation? I do agree is not extensive, but there is information for these particular questions..

Opaque..

  Reply With Quote

Old   May 7, 2007, 15:04
Default Re: Mesh Coordinates
  #3
Khaled & Noel
Guest
 
Posts: n/a
Thanks for the quick reply, and sorry for not explaining our problem clearly. We are trying to move the mesh of a mixer shaft in CFX. Our main problem, as of right now, is that we dont have any details as to how the mesh displacement equations are assembled and solved in CFX. When x, y, and z, are used in CEL expressions as input to a CEL subroutine, they are not all read at once. It seems that CFX reads x,y, and z on one location, then reads x,y, and z on another location, and so on until the whole domain is covered. What dictates this trend? is it the element types within each domain? What would save us alot of trouble is if x,y, and z, are read all at once, instead of the step-wise trend that we are witnessing. I hope this clarifies our problem.

Khaled & Noel
  Reply With Quote

Old   May 7, 2007, 15:26
Default Re: Mesh Coordinates
  #4
opaque
Guest
 
Posts: n/a
Dear Khaled & Noel,

Not much it can be done about it. The ANSYS CFX solver request data as needed within its algorithm.. Sometimes it may be the whole boundary, or fraction of it. The UserCEL function to move a boundary should support either a full request (rare), or a partial request (most common).

What are you trying to move? A boundary, and let the mesh deform? or trying to move the whole domain at once and you impose the new locations (assuming same node connectivity)?

There is a tutorial where a full mesh is read in every time step, and another tutorial where the boundary is moved and the mesh morphed by the solver.

Opaque..

  Reply With Quote

Reply

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
[ICEM] Hexa mesh, curve mesh setup, bunching law Anorky ANSYS Meshing & Geometry 4 November 12, 2014 01:27
non-smooth mesh Svensson OpenFOAM Native Meshers: snappyHexMesh and Others 11 January 18, 2012 10:13
snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Native Meshers: snappyHexMesh and Others 2 March 27, 2011 21:11
external flow with snappyHexMesh chelvistero OpenFOAM 11 January 15, 2010 20:43
Icemcfd 11: Loss of mesh from surface mesh option? Joe CFX 2 March 26, 2007 18:10


All times are GMT -4. The time now is 12:53.