# How EDM model works in CFX-5?

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

 June 18, 2002, 17:03 How EDM model works in CFX-5? #1 cfd guy Guest   Posts: n/a Hi everybody, I want to make a simple test with the EDM combustion model in CFX-5. My reacting fluid is Hydrogen Air (H2, O2, N2 and H2O). I've defined N2 as the constraint equation. I have several inlets and I've set the following mass fractions: 0.21 for O2, H2 = H2O = 0. In just one inlet I've set 1. for H2 and 0. for the other species. I'm not using any radiation model. First I've solved the turbulent flow and then I switched off the fluids and tke and epsilon equations. After a few iterations of the energy and mass fractions equations I've noted no presence of the H2O in my solution and no change in the temperature field, ie. no reaction. What did I forget to set? I tested both Bulk Viscosity and Kinematic Viscosity. My initial conditions for the flow are a cold flow converged solution and for the species are "Automatic with Value" : H2 = H2O = 0. ; O2 = 0.21 Thanks in advance, cfd guy

 June 19, 2002, 17:33 Re: How EDM model works in CFX-5? #2 Neale Guest   Posts: n/a Make sure you have some initial products in the domain. So, try reinitialising the H2O mass fraction to a non-zero value, say 0.01 or something and rerun it. Set the H2O mass fraction to "Value" in the CCL to do this, rather than "Automatic with Value". Neale

 June 20, 2002, 10:35 Re: How EDM model works in CFX-5? #3 cfd guy Guest   Posts: n/a Thanks Neale, But I found that the simplest way is to start from the scratch solving all equations together and the combustion effects will appear naturally. However, someone told me that is possible to trick the code and start a combustion problem from a cold solution modifying a simple coefficient in the EDM model. Regards, cfd guy

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post impecca OpenFOAM Running, Solving & CFD 4 December 20, 2013 11:36 Jade M Main CFD Forum 2 March 18, 2010 13:08 Tim CFX 1 October 7, 2009 06:19 steven CFX 6 January 17, 2007 12:19 Niels Deen CFX 0 July 19, 2000 08:50

All times are GMT -4. The time now is 14:12.