CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

OpenFOAM - Reverse flow occur while

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

Like Tree2Likes
  • 2 Post By matejfor

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 2, 2017, 17:15
Unhappy OpenFOAM - Reverse flow occur while
  #1
New Member
 
Mehmet OZGUNOGLU
Join Date: Oct 2016
Posts: 6
Rep Power: 9
ozgunoglu is on a distinguished road
Dear all,

I am trying to stabilize flame in Stagnation Point Reverse Flow Combustor (SPRF) using reactingFoam.

I ignited the flame using high temperature 1300 K fuel inlet then I am lowering to temperature to 330 K and expecting a continuous flame.

Actually, there is no problem about getting stable flame, however there seems a revers flow at the outlet which is fixed pressure boundary condition with a 101325 Pa.

The first thing I thought that existence of the low pressure products make the entire domain weaker than 101325 Pa outlet boundary condition.

How do you think that I can prevent reverse flow ?
What type of pressure boundary condition should I apply to the outlet?

I also attached pressure, temperature and Ux figures which shows the reverse flow at the outlet.

Thanks.




Last edited by ozgunoglu; February 2, 2017 at 17:17. Reason: misspelling
ozgunoglu is offline   Reply With Quote

Old   February 6, 2017, 07:21
Default
  #2
Senior Member
 
matej forman
Join Date: Mar 2009
Location: Brno, Czech Republic
Posts: 182
Rep Power: 17
matejfor is on a distinguished road
Hi,
the standard solution for outflow BC is to use inletOutlet BC.
It sets the zeroGradient for outflow situation and fixedValue for inflow situation.
You can use this one for velocity, temp and scalars to prescribe the fixed value if things go wrong.
http://www.openfoam.com/documentatio...d.html#details
ozgunoglu and jeytsav like this.
matejfor is offline   Reply With Quote

Reply

Tags
combustion, openfoam, pressure, reverse flow

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 4.0 Released CFDFoundation OpenFOAM Announcements from OpenFOAM Foundation 2 October 6, 2017 05:40
OpenFOAM Training Jan-Jul 2017, Virtual, London, Houston, Berlin CFDFoundation OpenFOAM Announcements from Other Sources 0 January 4, 2017 06:15
Reverse flow at boundary andyross33 CFX 2 August 27, 2013 13:24
CFDesign V11 -- Reverse flow at outlet maruthiv Autodesk Simulation CFD 1 June 17, 2011 09:38
Reverse Flow at Rotating Pipe Outlet vismech STAR-CCM+ 1 August 11, 2009 10:38


All times are GMT -4. The time now is 11:25.