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-   -   multifield problems on ia64 (http://www.cfd-online.com/Forums/ansys/72157-multifield-problems-ia64.html)

zegtuhetmaar January 27, 2010 10:11

multifield problems on ia64
 
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:confused:? Thanks

baserinia January 29, 2010 02:11

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.

zegtuhetmaar January 30, 2010 09:07

Quote:

Originally Posted by baserinia (Post 244164)
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?

zegtuhetmaar February 15, 2010 15:56

Since the update to 12.1, CFX got a GUI and I can run my calculations from the interface.

alinik October 3, 2010 02:32

hi

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

How did you make it work?

zegtuhetmaar October 3, 2010 10:40

just a "surface load" error could mean anything. Probably something wrong with the communication between different software. be more precise with your error

alinik October 3, 2010 10:51

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.

acaba October 21, 2010 13:18

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

Aaron


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