CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

Combustion over water Help!!!!

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

LinkBack Thread Tools Display Modes
Old   November 12, 2011, 14:20
Exclamation Combustion over water Help!!!!
New Member
Neal Wannell
Join Date: Nov 2011
Posts: 5
Rep Power: 8
njw is on a distinguished road
Hi there,

I am relatively new to Ansys and CFD in general and am having big problems with setting up a transient methane-oxygen combustion system over a free surface of liquid water on CFX.

I am trying to model both the liquid and gas phases and couple the two to determine evaporation rates and convection cells in both phases.
To start off I only have a simple 2D channel with free-slip walls everywhere except an opening at the end. I know its inaccurate but for the sake of computation time I am using the eddy dissipation and k-e models for combustion and turbulence respectively.

The system works without any ignition source present; the combustible atmosphere exists above the liquid surface. However, when I try to introduce a point energy source to ignite the mixture, the solver crashes on the first iteration loop every time.

Advice would be greatly appreciated!
njw is offline   Reply With Quote

Old   November 13, 2011, 17:58
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 14,310
Rep Power: 110
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
Does the free surface move? Have waves? Splashes, foam, bubble entrapment or anything like that?
ghorrocks is offline   Reply With Quote


combustion, evaporation, free surface model, methane, multi phase

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
Water subcooled boiling Attesz CFX 7 January 5, 2013 04:32
mass flow in is not equal to mass flow out saii CFX 2 September 18, 2009 08:07
Combustion with water cooling Hlynur Thorkelsson FLUENT 2 March 21, 2007 15:13
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
uptodate water distribution network fredius,magige,tanzanian,(e.a) Main CFD Forum 0 January 27, 2002 08:10

All times are GMT -4. The time now is 19:04.