Parallel processing results using FLUENT

haihek · July 31, 2012, 18:31

Hi,

Can anyone explain to me why i get somehow little different simulation results when i use single processor instead of parallel?

Any explanation will be helpful, and if you have references for that, that will be great!

Thank you.

BMCombustor · August 1, 2012, 16:43

Quote:

Originally Posted by haihek

Hi,

Can anyone explain to me why i get somehow little different simulation results when i use single processor instead of parallel?

Any explanation will be helpful, and if you have references for that, that will be great!

Thank you.

How many licenses are you using? If you have only one valid license and run your case on parallel, it won't make any difference.

Bionico · August 2, 2012, 03:10

Hi,
I think it's quite usual finding this difference: moreover, if you try the same simulation on the same workstation you'll have different results...of course the differences should be very very small
The computer schedules its processors and their conditions are different every time

amirokhovat · August 5, 2012, 08:55

your license is not valid
I had this problem my calculation with 6 core was true but with 4 was false and with single was true.
you can change the number of cpu core and look which will true.

July 31, 2012, 18:31	Parallel processing results using FLUENT	#1
haihek New Member Alex Hai Join Date: Mar 2010 Posts: 27 Rep Power: 16	Hi, Can anyone explain to me why i get somehow little different simulation results when i use single processor instead of parallel? Any explanation will be helpful, and if you have references for that, that will be great! Thank you.

August 2, 2012, 03:10		#3
Bionico Senior Member Flavio Join Date: Sep 2011 Location: Brescia, Italy Posts: 181 Rep Power: 16	Hi, I think it's quite usual finding this difference: moreover, if you try the same simulation on the same workstation you'll have different results...of course the differences should be very very small The computer schedules its processors and their conditions are different every time __________________ Bionico

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August 5, 2012, 08:55		#4
amirokhovat New Member amir okhovat Join Date: Sep 2011 Location: Iran- Isfahan Posts: 24 Rep Power: 15	your license is not valid I had this problem my calculation with 6 core was true but with 4 was false and with single was true. you can change the number of cpu core and look which will true.