Parallel fluent problem

salvoblack · February 24, 2011, 06:41

Hello everyone,
I am using parallel computing with fluent with 4 processors.
In particular I am studying an airfoil with Spalart-Allmaras turbulence model.
The strange thing is that depending on the number of processors used (1.2 or 4), when I go to perform in the "execute commands" command "extract airfoil cp etc. .." I get different points of my profile.
For example, by making a calculation with two parallel processors, the CP extract is 576 points, but if I use 4 processors becomes 582 points.
Someone suggested I change something in the 'execute commands "
Can you help me???

thanks a lot

xrs333 · February 27, 2011, 02:36

Hi,
That's because of different patitions created with different number of processes in case one of the partition interfaces across the face zone from which you extract the profile. May you try to partition the domain manually to see if that happen again.

salvoblack · March 2, 2011, 11:24

Hello,
I did as you say and I have no problem partitioning manually.
But since I have to export the pressure coefficient by "execute commands", there is a command that takes account of the parallel exporting only the nodes so effective??

February 24, 2011, 06:41	Parallel fluent problem	#1
salvoblack Member Join Date: Oct 2010 Location: Naples Posts: 50 Rep Power: 16	Hello everyone, I am using parallel computing with fluent with 4 processors. In particular I am studying an airfoil with Spalart-Allmaras turbulence model. The strange thing is that depending on the number of processors used (1.2 or 4), when I go to perform in the "execute commands" command "extract airfoil cp etc. .." I get different points of my profile. For example, by making a calculation with two parallel processors, the CP extract is 576 points, but if I use 4 processors becomes 582 points. Someone suggested I change something in the 'execute commands " Can you help me??? thanks a lot

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February 27, 2011, 02:36		#2
xrs333 Senior Member xrs333 Join Date: Aug 2010 Posts: 125 Rep Power: 17	Hi, That's because of different patitions created with different number of processes in case one of the partition interfaces across the face zone from which you extract the profile. May you try to partition the domain manually to see if that happen again.

March 2, 2011, 11:24		#3
salvoblack Member Join Date: Oct 2010 Location: Naples Posts: 50 Rep Power: 16	Hello, I did as you say and I have no problem partitioning manually. But since I have to export the pressure coefficient by "execute commands", there is a command that takes account of the parallel exporting only the nodes so effective??