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

Recirculation bubble stretching in laminar reacting flow simulation in reactingFoam

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 14, 2016, 12:24
Default Recirculation bubble stretching in laminar reacting flow simulation in reactingFoam
  #1
Member
 
Sheikh Ahmed
Join Date: Dec 2015
Location: South Carolina, USA
Posts: 88
Rep Power: 5
sahmed is on a distinguished road
Dear all
I want to share an issue with you and asking for your suggestion. This might be helpful for the reactive flow simulation community as well.
I am trying to simulate a reactive flow through a flow tube and the flue gases are coming from a Mckenna burner, burning lean syngas/air. First I did not simulate the flame, rather the post flame hot gases, coming from the burner. No combustion happened in that case. There I got a very good jet and a recirculation bubbles (please see the attached post flame simulation figures) when it reached Steady state condition in 3 secs..

But when I simulated the flame+post flame with combustion happening, within a very short time (~1 sec), the bubble got stretched and the jet did not break (see the attached flame simulation figures). Since the mesh needs to be very very fine for capturing the flame, I took a shorter domain length, but should still be ok to assume a zero-gradient BC at the outlet.

Could anyone please tell me why is this 'bubble stretching' happening when I have combustion and not happening without any combustion.
Attached Files
File Type: pdf simulations.pdf (149.0 KB, 21 views)
sahmed is offline   Reply With Quote

Old   December 15, 2016, 12:44
Default Please suggest or comment
  #2
Member
 
Sheikh Ahmed
Join Date: Dec 2015
Location: South Carolina, USA
Posts: 88
Rep Power: 5
sahmed is on a distinguished road
Anybody has any idea or suggestion or comment, or anyone faced similar kind of problem for other cases, PLEASE share.
sahmed is offline   Reply With Quote

Old   December 19, 2016, 11:35
Default
  #3
Member
 
Sheikh Ahmed
Join Date: Dec 2015
Location: South Carolina, USA
Posts: 88
Rep Power: 5
sahmed is on a distinguished road
Dear Foamers
Please share your thoughts about the issue.
sahmed is offline   Reply With Quote

Reply

Tags
combustion, mckenna burner, reactingfoam, recirculation bubbles

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
Ratio of eddy viscosity to molecular viscosity : Laminar or turbulent flow? JuPa CFX 7 September 9, 2013 08:45
Coupling of drying process and flow simulation franzdrs Main CFD Forum 0 April 29, 2013 15:11
Simulation of laminar flow of 2 liquids inside microchannel sekar harikrishnan FLUENT 0 March 8, 2013 04:53
Simulation of Steady-State Flow in a Constricted Tube with Laminar Viscous Model rezatabe FLUENT 2 September 9, 2011 13:49
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 22:31


All times are GMT -4. The time now is 09:56.