How can i solve this problem?

ZanG · August 21, 2018, 20:08

I have some problems with the UDF library in fluent. How can i solve the problem according the attached picture?

Please help me.

AlexanderZ · August 22, 2018, 01:46

as you may see, the problem is clearly described.
UDF library, that you are trying to use is not compiled for parallel regime.
So you may do:
1. start fluent in 1 core regime
2. run fluent in parallel regime, recompile UDF

best regards

ZanG · August 22, 2018, 08:09

Thank you Alexander, but i don't understand very well can you explain more?

LuckyTran · August 22, 2018, 11:40

That library doesn't work in parallel. Either you make it work in parallel by rewriting it (probably not an option) or you run in serial.

Since v19? Fluent no longer has a serial mode by default. Even if you launch with 1 core it is actually running in parallel mode. The reason for this change because there's no reason to use serial anything in this day and age. I believe the command to start Fluent in vanilla serial mode is to launch it with the -t0 flag. It appears in a warning message if you are using the newer versions.

If you are using an older version, then simply run fluent in serial mode.

ZanG · August 22, 2018, 15:43

Thank you Lucky, but i am a initial student about ANSYS FLUENT, could you send me some pictures with this procedure? My version is 19.1

Thank you very much.

August 22, 2018, 11:40		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	That library doesn't work in parallel. Either you make it work in parallel by rewriting it (probably not an option) or you run in serial. Since v19? Fluent no longer has a serial mode by default. Even if you launch with 1 core it is actually running in parallel mode. The reason for this change because there's no reason to use serial anything in this day and age. I believe the command to start Fluent in vanilla serial mode is to launch it with the -t0 flag. It appears in a warning message if you are using the newer versions. If you are using an older version, then simply run fluent in serial mode. ZanG likes this. Last edited by LuckyTran; August 22, 2018 at 13:11.

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August 22, 2018, 01:46		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	as you may see, the problem is clearly described. UDF library, that you are trying to use is not compiled for parallel regime. So you may do: 1. start fluent in 1 core regime 2. run fluent in parallel regime, recompile UDF best regards

August 22, 2018, 08:09		#3
ZanG New Member Join Date: Aug 2018 Posts: 8 Rep Power: 7	Thank you Alexander, but i don't understand very well can you explain more?

August 22, 2018, 15:43		#5
ZanG New Member Join Date: Aug 2018 Posts: 8 Rep Power: 7	Thank you Lucky, but i am a initial student about ANSYS FLUENT, could you send me some pictures with this procedure? My version is 19.1 Thank you very much.