CFD Online Discussion Forums - Combustion in a closed System

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