Chemical Reaction Maximum Step for Combustion CFD-STARCCM

Stalline · November 18, 2019, 06:05

Hello, I need some help for the combustion simulation
I used StarCCM to do simulation, and usually for the chemical reaction, thermo and transport I use GRI 3.0 Mechanism (more than 300 reaction steps).

Actually I got good result when I use GRI 3.0 mech, even though when I check the OH mole fraction, it show little bit long concentration region, but the temperature looks fine

so I want to test using another chemical reaction and right now I want to use USC version II (more than 700 reaction steps).

when I tried to import it to StarCCM it just loading and take so much time, I think it is not normal. So is there any limit for the chemical reaction steps for StarCCM?

fyi, I usually use 30 cores for load the GRI and it is quite fast

I really appreciate if there is somebody can help me to overcome this problem

LuckyTran · November 20, 2019, 15:04

There shouldn't be any limit...

Reading the reactions is simply reading a text file, using a million cores will not speed this up.

Stalline · November 20, 2019, 23:21

Quote:

Originally Posted by LuckyTran

There shouldn't be any limit...

Reading the reactions is simply reading a text file, using a million cores will not speed this up.

Thank you Mr Lucky Tran, well I tried to import it and leave it for one day, and the mechanism still not imported yet, I don't know what happened actually

November 18, 2019, 06:05	Chemical Reaction Maximum Step for Combustion CFD-STARCCM	#1
Stalline New Member Stalline Join Date: Nov 2019 Posts: 2 Rep Power: 0	Hello, I need some help for the combustion simulation I used StarCCM to do simulation, and usually for the chemical reaction, thermo and transport I use GRI 3.0 Mechanism (more than 300 reaction steps). Actually I got good result when I use GRI 3.0 mech, even though when I check the OH mole fraction, it show little bit long concentration region, but the temperature looks fine so I want to test using another chemical reaction and right now I want to use USC version II (more than 700 reaction steps). when I tried to import it to StarCCM it just loading and take so much time, I think it is not normal. So is there any limit for the chemical reaction steps for StarCCM? fyi, I usually use 30 cores for load the GRI and it is quite fast I really appreciate if there is somebody can help me to overcome this problem

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November 20, 2019, 15:04		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,751 Rep Power: 66	There shouldn't be any limit... Reading the reactions is simply reading a text file, using a million cores will not speed this up.