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Ansys fluent in multi core cpu´s

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Old   November 18, 2010, 09:15
Default Ansys fluent in multi core cpu´s
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Antonio Lopez
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Hi all!,

I´m working with ANSYS FLUENT with an i7 with Windows 7, but I have realised that FLUENT only use one core (13% of CPU). How could I make Fluent use all cores?

Thanks
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Old   November 18, 2010, 13:02
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i have to ask. have you set up the simulation to be solved in parallel?

look at the attached image
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Old   November 18, 2010, 14:12
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Yes, I have done it, but when I select parallel (4 processes) fluent shows a warning message and i though parallel was only for more than one PC´s working in parallel.

In this case, why is the message warning?
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Old   November 18, 2010, 14:55
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can you specify what the message says? in my setup i don't get any and i can select where to run the parallel solution, in my local machine or else.

take a look at the screenshots i have attached.
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Old   November 19, 2010, 00:41
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Sriram "Rob" Atchutuni
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Do you know if you have the parallel licenses to access additional cores? You will need HPC licenses to do this.
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Old   November 20, 2010, 06:37
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The error says:

Warning: No cached password or password provided. Use pass or cache to provide password

Need I an special license?

Thanks all
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Old   November 28, 2010, 12:00
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It might be a licence issue, but try this, it worked for me on an i7/xeon 64-bit Win 7:

Open command prompt (cmd.exe) - Type CMD in start menu search bar.
In Command Prompt, type: cd (fluent folder path)
e.g.: cd C:\Program Files\ANSYS Inc\v121\fluent\ntbin\win64
Press Enter
It should now say: C:\Program Files\ANSYS Inc\v121\fluent\ntbin\win64>
Type: fluent (dimension)(double precision if wanted) (-t(number of parallel cores to be used))
e.g.: fluent 3ddp -t3
Press Enter
This will make fluent run in 3d mode, with Double Precision, using 3 cores (advised on a 4-core machine so you can still use it for basic tasks during solve.)

See if that works
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Old   December 1, 2010, 10:00
Default Mpi
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Ronald A. Lau
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(Assuming you have the parallel licenses)

Did you install the HPMPI software?
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Old   September 14, 2011, 07:43
Default Parallel Fluent
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I have 32 GB ram, Intel Xeon processor X5660, 2.80 GHz, 12 MB cache, 1333 MHz memory, Six-Core (two processors) and win7 . But I couldn't run fluent in parallel (local Machine). Please help me how to run it?
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Old   September 28, 2011, 08:53
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Hi all,

I have installed Fluent 12 on Windows 7 pro (64 bit).

The machine has following specs:

Intel® Core i7 950 Processor (3,06Ghz - 8 MB)
12 GB DDR3 1600 MHz (3 x 4 GB)


I have tried to open a parallel version of fluent (local Machine). When I want to start fluent I got following error:


-------------------------------------------------

Loading "\VMEERTENS-PC\C$\PROGRA~1\ANSYSI~1\v120\fluent\fluent12.0.16\ lib\fl114-64.dmp"
Done
Welcome to ANSYS FLUENT 12.0.16
Copyright 2009 ANSYS Inc.
All Rights Reserved. Unauthorized use, distribution or duplication
is prohibited. ANSYS and FLUENT are trademarks or registered trademarks
of ANSYS, Inc. or its subsidiaries in the United States or other countries.
Loading "\\VMEERTENS-PC\C$\PROGRA~1\ANSYSI~1\v120\fluent\fluent12.0.16\ lib\flprim1119-64.dmp"
Done.
CX_Client_Register (rpc connect): No such file or directory
Error: There is no active application.
Error Object: (grid-valid?)
version>
Interrupting...
Done.
Error: There is no active application.
Error Object: (grid-valid?)

-------------------------------------------------


I tried the other settings under “parallel settings” but I still got the same error message.

I didn’t install any MPI software because I thought it is already integrated in W7.

But after reading some threads I’m not so sure anymore…

Maybe this has something to do with the Fluent prerequisites I installed the first time? If I remember it well, Fluent installed the C++ 2005 version and asked for a change in the control panel for a SP.

If anyone has an idea for successful parallel settings, please let me know.


This could also just be a licensing/MPI problem, but I’m new in it.

Sincerely

Vincent

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Old   January 18, 2012, 16:25
Default I need help in Fluent !
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Fahed Hamzeh
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I have Tow PC'S 8 Cores each, i Have installed Ansys 14 . Now i'm working with Fluent.
How can i use the the tow PC's parallement to use 16 Cores ?.
Do i need any addition license ?
Please help me ....... Many thank's
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Old   November 10, 2012, 01:37
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Only start Fluent with Win command prompt and enter your correct password !
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Old   January 11, 2013, 21:29
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I haven't been fixing ansys for running with 12 cores,
Have you fixed this problems for 16 cores ? Please share how to fix...
Many thanks !
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Old   May 7, 2013, 22:17
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Quote:
Originally Posted by vmeertens View Post
Hi all,

I have installed Fluent 12 on Windows 7 pro (64 bit).

The machine has following specs:

Intel® Core i7 950 Processor (3,06Ghz - 8 MB)
12 GB DDR3 1600 MHz (3 x 4 GB)


I have tried to open a parallel version of fluent (local Machine). When I want to start fluent I got following error:


-------------------------------------------------

Loading "\VMEERTENS-PC\C$\PROGRA~1\ANSYSI~1\v120\fluent\fluent12.0.16\ lib\fl114-64.dmp"
Done
Welcome to ANSYS FLUENT 12.0.16
Copyright 2009 ANSYS Inc.
All Rights Reserved. Unauthorized use, distribution or duplication
is prohibited. ANSYS and FLUENT are trademarks or registered trademarks
of ANSYS, Inc. or its subsidiaries in the United States or other countries.
Loading "\\VMEERTENS-PC\C$\PROGRA~1\ANSYSI~1\v120\fluent\fluent12.0.16\ lib\flprim1119-64.dmp"
Done.
CX_Client_Register (rpc connect): No such file or directory
Error: There is no active application.
Error Object: (grid-valid?)
version>
Interrupting...
Done.
Error: There is no active application.
Error Object: (grid-valid?)

-------------------------------------------------


I tried the other settings under “parallel settings” but I still got the same error message.

I didn’t install any MPI software because I thought it is already integrated in W7.

But after reading some threads I’m not so sure anymore…

Maybe this has something to do with the Fluent prerequisites I installed the first time? If I remember it well, Fluent installed the C++ 2005 version and asked for a change in the control panel for a SP.

If anyone has an idea for successful parallel settings, please let me know.


This could also just be a licensing/MPI problem, but I’m new in it.

Sincerely

Vincent
your license is not right ,you must get a good license
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Old   November 28, 2013, 19:18
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When start Fluent setup, there are menu to put in the number of cores which you would like to run, however if you setting 4 cores one of them will run about 13%. I think it might because this core is use as the server core to manage other cores.
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Old   November 28, 2013, 19:21
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Yes, I'm able to run academic license only 8 core on 16 cores machine. For additional cores, you have to pay for that.
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Old   December 19, 2013, 10:58
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Quote:
Originally Posted by ronaldalau View Post
(Assuming you have the parallel licenses)

Did you install the HPMPI software?
Where from? All right, I found where, but doesn't help. WHen opening parallel, ansys just stops there with a message "host spawning node 0 on machine xxx"
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Old   April 7, 2014, 06:31
Default use this.
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http://www.edr.no/index.php/blogg/an...pu_performance
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Old   May 29, 2014, 03:09
Default use this
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to solve this when opening setup, choose parallel setting, and change the default one to pcmpi and it should works.
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