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

Patching Zones - DISCONTINUITY at Borders

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 26, 2015, 09:30
Default Patching Zones - DISCONTINUITY at Borders
  #1
New Member
 
Gergö Schmidt
Join Date: Oct 2015
Posts: 5
Rep Power: 11
Fettmon is on a distinguished road
Hi everybody

My problem is the following. I have two zones (z1 and z2). I patch two different pressure values (p1 and p2) to theese zones using "Solution -> Solution Initialization -> Patch".

I want a discontinous pressure distribution on the border between z1 and z2

But Fluent produces a continous (smeared) transition on the border

My question is therefor: is there an option for discontinuously patching values to zones? Or is there another way to assign initial conditions to zones?

Thank you, kind regards,
Gergö
Fettmon is offline   Reply With Quote

Old   October 26, 2015, 13:54
Default
  #2
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,760
Rep Power: 66
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
I am assuming you correctly patched a discontinuous pressure to two different cell zones. If so, I don't think that is an actual problem. Recall that Fluent is a finite-volume solver with dynamic variables stored at cell centers. Nothing is stored on cell faces. Hence you cannot specify anything at a border between two cell-zones. The face values are computed from the cell values according to the discretization schemes. The only exception is if you have a boundary condition, then the face values are imposed. The transition you are seeing is a plotting problem. But if you think that the discretization schemes are not appropriate for your problem, then you have a much bigger issue to deal with.

Last edited by LuckyTran; October 27, 2015 at 09:51.
LuckyTran is offline   Reply With Quote

Old   October 27, 2015, 03:23
Default
  #3
New Member
 
Gergö Schmidt
Join Date: Oct 2015
Posts: 5
Rep Power: 11
Fettmon is on a distinguished road
Thank You, LuckyTran! I forgot the cell centred property of the solver. Only two rows of cells are affected by the transition, so you're absolutely right!
Fettmon is offline   Reply With Quote

Reply

Tags
discontinuous, patch, pressure, smearing, zones

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
[OpenFOAM.org] Compile OF 2.3 on Mac OS X .... the patch gschaider OpenFOAM Installation 225 August 25, 2015 20:43
Initializing or patching cell zones kozalp FLUENT 0 December 30, 2013 17:00
patch error OF v2.2.2 mac hewei OpenFOAM Installation 4 November 30, 2013 17:55
2.0.x on Mac OSX niklas OpenFOAM Installation 74 March 28, 2012 17:46
OpenFOAM on MinGW crosscompiler hosted on Linux allenzhao OpenFOAM Installation 127 January 30, 2009 20:08


All times are GMT -4. The time now is 05:08.