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

Defining Deforming Dynamic Zone Causes Divergence

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 4, 2020, 12:00
Angry Defining Deforming Dynamic Zone Causes Divergence
  #1
New Member
 
Mostafa
Join Date: Sep 2016
Posts: 22
Rep Power: 5
bikooo3878 is on a distinguished road
Hello Everyone,

I am trying to simulate the movement of a pressure relief valve. I've written a UDF for the valve movement and used spring function from the 6DOF settings. However, why is it when I define the triads zone as deforming it leads to instant divergence as shown, and when I define only the stationary boundaries and the valve it works perfectly well!.

https://drive.google.com/open?id=1-f...KYvpvVF2D-t6ah

https://drive.google.com/open?id=1Zf...zqjLInlmwMmAVM

you can also download the archived project from here if it helps.

My setup should be similar to that in this tutorial. So, if anyone can explain to me what am I doing wrong or missing I'd be very grateful

thank you
bikooo3878 is online now   Reply With Quote

Old   April 4, 2020, 12:17
Default
  #2
New Member
 
Mostafa
Join Date: Sep 2016
Posts: 22
Rep Power: 5
bikooo3878 is on a distinguished road
I know this geometry will lead to reversed flow, but I'm just interested in these holes that appear in the mesh at the moment.
bikooo3878 is online now   Reply With Quote

Old   April 4, 2020, 13:49
Default
  #3
New Member
 
Mostafa
Join Date: Sep 2016
Posts: 22
Rep Power: 5
bikooo3878 is on a distinguished road
Heads up!!

I've been trying to find out what's wrong for several days now and finally it worked!

most probably it was due to the reason I named a zone "deforming_zone" to set it as deforming (obviously). This led to fluent creating an interior-deforming_zone and my "deforming zone", which when was set as deforming...there was no error

Also seems that when I am not defining any deforming zone, fluent auto-detects triads zone and apply a deforming region to it, but I'm not sure

Just glad it worked!
bikooo3878 is online now   Reply With Quote

Old   April 6, 2020, 06:24
Default Deforming Zone
  #4
Senior Member
 
vinerm's Avatar
 
Vinerm
Join Date: Jun 2009
Location: Nederland
Posts: 2,948
Blog Entries: 1
Rep Power: 31
vinerm will become famous soon enough
You understood it correctly. Fluent does not expect users to define any cell zone as deforming. Only the boundary zones should be deforming. Cell zone deformation is determined by Fluent using boundary deformation and the method(s) selected out of remeshing, smoothing, and/or layering.
__________________
Regards,
Vinerm

PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.
vinerm is offline   Reply With Quote

Reply

Tags
deforming mesh, divergence, dynamic mesh, fluent, udf

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
Two Phase Flow In Vertical Pipe stonepreston FLUENT 2 October 31, 2017 08:35
Error in solution using "Grid Interface" agustinvo FLUENT 4 January 20, 2015 12:03
[GAMBIT] periodic faces not matching Aadhavan ANSYS Meshing & Geometry 6 August 31, 2013 11:25
Changing the Motion Attribute of a Dynamic Zone banjo FLUENT 2 February 17, 2013 14:52
Sliding mesh error Karl Kevala FLUENT 4 February 21, 2001 15:52


All times are GMT -4. The time now is 20:07.