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multifield problems on ia64

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Old   January 27, 2010, 10:11
Unhappy multifield problems on ia64
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Koen Stegeman
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I am doing a multifield analysis (Ansys-CFX) on a linux server ia64.
When I start my analysis with command:

cfx5solve -def 'deffile' -batch -start-method "MPICH Local Parallel" -part 4

it will kill the analysis just after initializing:

Code:
MULTI FIELD ANALYSIS STEP OPTIONS
 TIME AT BEGINNING OF ANALYSIS. . . . . . .   0.0000    
 TIME AT END OF ANALYSIS. . . . . . . . . .   2.0000    
 TIME STEP NUMBER. . . . . . . . . . . . . . .   1
 STAGGER ITERATION NUMBER. . . . . . . . . . .   1.   CUM MF ITER =      1
                  FIELD INFORMATION FOR MULTIFIELD ANALYSIS
 CURRENT FIELD NAME FOR ANALYSIS. . . . . ANSYS
 TIME AT BEGINNING OF CURRENT ANALYSIS. . .   0.0000    
 TIME AT END OF CURRENT ANALYSIS. . . . . .  0.50000E-01
 THIRD SYNCHRONIZATION POINT OF MASTER CODE: 
 SERVE SLAVES THE TIME STEP CONTROL INFORMATION TO START A SOLVE
 FOURTH SYNCHRONIZATION POINT OF MASTER CODE: 
 LOAD TRANSFER AT THE BEGINNING OF SOLUTION
 *********************
 MF_send_Error
  Msg:     
 Read                                                                           
 
 
 
 *** FATAL ***                           CP =      43.848   TIME= 12:45:51
 Error during get surface loads: Total Force.  Error Message: Read.      
 ALL CURRENT ANSYS DATA WRITTEN TO FILE NAME= ansabort.db
  FOR POSSIBLE RESUME FROM THIS POINT
However, using a 32 bit machine I don't get this error:
Code:
MULTI FIELD ANALYSIS STEP OPTIONS
 TIME AT BEGINNING OF ANALYSIS. . . . . . .   0.0000    
 TIME AT END OF ANALYSIS. . . . . . . . . .   2.0000    
 TIME STEP NUMBER. . . . . . . . . . . . . . .   1
 STAGGER ITERATION NUMBER. . . . . . . . . . .   1.   CUM MF ITER =      1
                  FIELD INFORMATION FOR MULTIFIELD ANALYSIS
 CURRENT FIELD NAME FOR ANALYSIS. . . . . ANSYS
 TIME AT BEGINNING OF CURRENT ANALYSIS. . .   0.0000    
 TIME AT END OF CURRENT ANALYSIS. . . . . .  0.50000E-01
 THIRD SYNCHRONIZATION POINT OF MASTER CODE: 
 SERVE SLAVES THE TIME STEP CONTROL INFORMATION TO START A SOLVE
 FOURTH SYNCHRONIZATION POINT OF MASTER CODE: 
 LOAD TRANSFER AT THE BEGINNING OF SOLUTION
FORCE SUM FOR FIELD   1 ACROSS INTERFACE   1
RECEIVING FORCE FX SUM =  0.0000    
RECEIVING FORCE FY SUM =  0.0000    
RECEIVING FORCE FZ SUM =  0.0000
But this machine is way too slow.

I also get at the same moment a unaligned access warning.

Does anyone have any idea how to solve this problem? Thanks
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Old   January 29, 2010, 02:11
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A.R. Baserinia
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Hi, I don't know whether this is the answer to your question, but I usually use PVM rather than MPICH for local parallel runs on my AMD64 Linux machine.
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Old   January 30, 2010, 09:07
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Koen Stegeman
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Quote:
Originally Posted by baserinia View Post
Hi, I don't know whether this is the answer to your question, but I usually use PVM rather than MPICH for local parallel runs on my AMD64 Linux machine.
Thanks baserinia, but unfortunately it doens't work. Neither does HP MPI.

I hope somebody knows a solution?
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Old   February 15, 2010, 15:56
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Koen Stegeman
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Since the update to 12.1, CFX got a GUI and I can run my calculations from the interface.
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Old   October 3, 2010, 02:32
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ali
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hi

I am getting the same error"error during get surface loads"

How did you make it work?
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Old   October 3, 2010, 10:40
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Koen Stegeman
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just a "surface load" error could mean anything. Probably something wrong with the communication between different software. be more precise with your error
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Old   October 3, 2010, 10:51
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ali
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The text of the error that I am getting is exactly the same as the one that you were getting. what more do you need to know?
if you want to know about the problem, I can say that it is a two way FSI simulation for modeling an unsteady non-newtonian fluid flow inside a compliant vessel.
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Old   October 21, 2010, 13:18
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Aaron
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I'm not sure if this will solve your problem, but there was a service pack for Ansys 12.1 to enable 2-way FSI for 64 bit computers. Check out the ANSYS customer portal -> Download Software -> Standard Versions -> Product Updates

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