Different results when I use parallel computing

ehsan120 · June 26, 2020, 17:50

Hi,

I am trying to solve a simple combustion problem with Fluent. However, the result of the mass fraction for specific gas when the Solver Processes parameter is 1 is significantly different from the case when I change it to 16. Do you have any idea where this difference is coming from and how I can fix it?

Thanks

LuckyTran · June 26, 2020, 18:22

Any convergence or stability issues?

ehsan120 · June 26, 2020, 18:29

Yes, I understand. It seems I didn't describe the problem very well.
I am just changing the number of the processors to 16, and as a result, the mass fraction at the end of the time step in my goal location is significantly different from the case I have just 1 processor!

Thanks

ehsan120 · June 26, 2020, 18:31

No issue at all. It's working very well in both cases. However, the results are different.

June 26, 2020, 17:50	Different results when I use parallel computing	#1
ehsan120 New Member Join Date: Apr 2020 Posts: 12 Rep Power: 6	Hi, I am trying to solve a simple combustion problem with Fluent. However, the result of the mass fraction for specific gas when the Solver Processes parameter is 1 is significantly different from the case when I change it to 16. Do you have any idea where this difference is coming from and how I can fix it? Thanks

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June 26, 2020, 18:22		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 65	Any convergence or stability issues?

June 26, 2020, 18:29		#3
ehsan120 New Member Join Date: Apr 2020 Posts: 12 Rep Power: 6	Yes, I understand. It seems I didn't describe the problem very well. I am just changing the number of the processors to 16, and as a result, the mass fraction at the end of the time step in my goal location is significantly different from the case I have just 1 processor! Thanks

June 26, 2020, 18:31		#4
ehsan120 New Member Join Date: Apr 2020 Posts: 12 Rep Power: 6	No issue at all. It's working very well in both cases. However, the results are different.