Hello Everyone,

(Sorry the last post was difficult to read so I am posting again.)

I am new to Fluent and have been doing some modeling recently. I am studying the combustion of air and hydrogen in a closed chamber. My 2-D mesh looks like a donut with an inner radius of .3mm and outer of 50mm and this has been cut in half for symmetry purposes. I am having trouble modeling in a closed chamber and hope you can help me out. There was a bit of information given on 2004 by someone with the name of Jim (Combustion in a closed system, Posted By: Jim, Date: Mon, 6 Dec 2004, 12:10 p.m.). I would like to start my combustion of the gas at the small inner diameter "hot-wire". This surface should be somewhere from 875 to 1300 deg C. I have done the following procedure to accomplish this and then at the end I am unable to define the temperature of the hot-wire and chamber wall.

 File->Read Case->2d chamber 05.msh

 Grid->Check

 Grid->Scale->mm->Scale->Close

 Define->Models->Solver->Time->Unsteady->Ok

 Define->Models->Radiation->P1->Ok->Ok to the warning

 Define->Models->Viscous->K-epsilon(2eqn)->OK

 Define->Models->Species->Premixed Combustion->Apply->Ok to the warning->Ok

 Define->Materials->Fluent Database->Then I picked out air and hydrogen->changed absorbtion coefficient to 10 for both of them and each time clicked on Change/Create->Close

 Define->operating conditions->Checked Gravity->Y=-9.8->ok

 Define->Boundary Conditions->Hot Wire->###Can't define temperatures here###

Any ideas suggestions are appreciated. If you need further information please email me at macastil@mines.edu.

Thanks, Dr. Martin Castillo

Sorry, I believe that you have to move out of the Adiabatic regime to the Non-Adiabatic regime.

Did you enable the energy equation?

Hello Neil, Thanks for your fast response. The energy equation was automatically enabled by the radiation model and changing the parameter to non-adiabatic conditions. Just to be safe, I did go back and make sure it was enabled. My main mistake was not enabling non-adiabatic conditions. Thanks for your help. -Martin