CFD Online URL
[Sponsors]
Home > Forums > Fluent UDF and Scheme Programming

sliding User-Defined Memories along the mesh

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 29, 2010, 10:09
Default sliding User-Defined Memories along the mesh
  #1
New Member
 
ludovic horion
Join Date: May 2010
Posts: 1
Rep Power: 0
ludohorion is on a distinguished road
Hi all,

I am modelling mass transfer in a domain. The system is composed of a porous medium, and a gas flowing through it.

I defined 10 UDM in my system. Each UDM represents a discretization point of the concentration profile.

To be clear: I have written an UDF that takes as an argument 10 points of a concentration profile, calculates a mass transfer, and gives out the new concentration profile. Each cell of the domain has then its own concentration profile (i.e. its own 10 UDM's).

Now, I would like to simulate of uniform downward motion of all the UDM's in the domain. If you imagine that the mesh is a (50x5 cells) rectangle for example, this means it contains 250 cells, and each cell has an associated concentration profile (i.e. 10UDMs per cell). At time step t=0+dt, I update all UDM's. Then at t = 0+2*dt, I would like to suppress all UDM's of the line 50 of my mesh, I would like to add a new line (line 1) of UDM's with given initial values, and finally I would like to shift all other 48 lines of UDM from one position down.

So now, I have 50x5 new concentration profiles, and then I do the same at the next time step, and so forth...

My question is: how to implement this into FLUENT? I guess I should take advantage of the EXECUTE_AT_END() macro, to do the algorithm at the end of each timestep. But how can I refer explicitly to the UDM's of the top line of the mesh, or to the UDM's of the bottom line of the mesh?

Thank you very much.

Ludovic.
ludohorion is offline   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
3D Hybrid Mesh Errors DarrenC ANSYS Meshing & Geometry 11 August 5, 2013 07:42
Sliding mesh error alice FLUENT 3 February 21, 2012 06:53
Mesh deformation using user fortran matled CFX 3 February 18, 2010 17:49
external flow with snappyHexMesh chelvistero OpenFOAM 11 January 15, 2010 20:43
dynamic mesh and sliding mesh nasser FLUENT 0 November 1, 2005 03:37


All times are GMT -4. The time now is 07:31.