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

Dynamic mesh simulation

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 7, 2010, 15:43
Default Dynamic mesh simulation
  #1
Member
 
Join Date: Apr 2009
Posts: 35
Rep Power: 8
artemiss1984 is on a distinguished road
Hi.

I want to simulate a 2d channel (unsteady) flow in fluent using the dynamic mesh technique. The upper wall of channel is stationary and the lower wall is deforming in sinusoidal motion (function of x and t). The inlet and outlet B.C s are pressure inlet and pressure outlet, therefore flow is completely induced with the lower wall motion. I could prepare the proper udf which is complied without error in Fluent but I have negative volume in the domain after grid updating. I guess it is due to dynamic mesh model.
I am using the two dynamic mesh models: smoothing,re meshing for lower deforming wall.stationary condition for upper wall.

I am very great full if somebody can help me.
artemiss1984 is offline   Reply With Quote

Old   August 11, 2010, 13:11
Default Problems with dynamic mesh
  #2
New Member
 
Join Date: Aug 2010
Posts: 2
Rep Power: 0
yoossie is on a distinguished road
Hi,

I have a similar problem with the dynamic mesh in Fluent. I am simulating a 2D engine, I have followed the Tutorial 12, but trying to adapt it to my real problem due to I have not the .msh or .cas of this tutorial. The problem that I have found is in the events, when I am trying to introduce them in my problem I see that they have defined some border conditions that I don't have in my problem, but the worst is that I don't know where are located exactly, so, if someone has any idea of how to do or has the file and can send me, I will be very pleased.

My problem, as I am seeing that I haven't say, is also that appears some warnings (in the mesh motion) about negative volume (so artemiss1984 it must be the dynamic mesh, I am pretty sure ) cells...

If it isn't this...Could be also the dymanic mesh zones? I have defined the movement of my valves, and of my pistons, also my interior as deforming, and my walls as stationary...but I don't know if they are well defined.

Thanks for your answers, and sorry artemiss1984 for using your topic for asking my problem, but I think that could be useful for both of us.
yoossie 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
SnappyHexMesh for internal Flow vishwa OpenFOAM Native Meshers: snappyHexMesh and Others 23 August 6, 2014 03:50
Replacing mesh while running a simulation akultane CFX 1 November 15, 2009 14:46
Mesh used for Combustion Simulation Stein CFX 5 May 14, 2009 18:24
Convergence moving mesh lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 15:09
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 02:44.