Combustion Modeling in internal combustion engine

Joeyt · July 26, 2012, 16:36

Hello!
I am trying to run a 3D in-cylinder spark ignited combustion model of of an engine. I can run the model perfectly through a cycle with cold air, but when I introduce combustion with a premixed fuel model the solution diverges just a few time steps after spark ignition. I tried playing around with the underrelaxation factors, but it is still diverging at the same point. are there any tricks to addressing this type of situation that someone has dealt with before?

Thanks!

amitbdt143 · May 23, 2013, 08:57

Hi Joeyt,
Did U Solve your combustion problem successfully. Now I'm facing the problem as you mentioned above.

Regards
Amit

zcarral · May 25, 2013, 15:20

Try to refine the mesh, reduce the time step and incement the relaxation factors.

amitbdt143 · May 26, 2013, 06:30

Thanks for your suggestion. I'll try it out.

Regards
Amit Kumar

July 26, 2012, 16:36	Combustion Modeling in internal combustion engine	#1
Joeyt New Member CO Join Date: Jul 2012 Posts: 1 Rep Power: 0	Hello! I am trying to run a 3D in-cylinder spark ignited combustion model of of an engine. I can run the model perfectly through a cycle with cold air, but when I introduce combustion with a premixed fuel model the solution diverges just a few time steps after spark ignition. I tried playing around with the underrelaxation factors, but it is still diverging at the same point. are there any tricks to addressing this type of situation that someone has dealt with before? Thanks!

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May 23, 2013, 08:57		#2
amitbdt143 New Member Amit Join Date: Nov 2012 Posts: 9 Rep Power: 14	Hi Joeyt, Did U Solve your combustion problem successfully. Now I'm facing the problem as you mentioned above. Regards Amit

May 25, 2013, 15:20		#3
zcarral Member Zacarias Carral Join Date: Sep 2012 Posts: 35 Rep Power: 14	Try to refine the mesh, reduce the time step and incement the relaxation factors.

May 26, 2013, 06:30		#4
amitbdt143 New Member Amit Join Date: Nov 2012 Posts: 9 Rep Power: 14	Thanks for your suggestion. I'll try it out. Regards Amit Kumar