Learning Forum

[tayyaba.bano]

Hi all,

I am facing the error while opening the result file in Mechanical APDL. It says that the current result file may not contain the requested data.

I tried to resolve this matter by the discussion already done in the forum but unfortunately not able to recover the result file.

I see the 'solve.out' text file in the folder dp0-SYS-MECH and at the final stage it says:

" *** ERROR ***                         

 The system coupling service error notification: Error reading          

 Attribute[Levels Name] "

I have all the fluid data by Fluent but unfortunately I cannot have the structure information.

Also I have the crash_01_00000-scr in dp0-SC-SC. Is there any problem due to this crash? or how can I have my result file.

Please if any one can help.

Thanks

Tayyaba

[tayyaba.bano]

Moreover,it says 'Solve Required'

[Sheldon Imaoka]

If you review the Solver Output (solve.out), does it indicate that 1 substep converged? Did the error appear at the start of the analysis? If your FSI problem is set up to solve Fluid domain first but the error appears on the Structural side, that can explain why you have Fluid results but not Structural results.
There may be a problem on the FSI definition - I would double-check the "Fluid Solid Interface" definition in Mechanical as well as your setup in Fluent.
Regards Sheldon

[tayyaba.bano]

Hi Thank you very much for your reply. A little bit more from the simulation error:
I run the simulations with time step of 1e-3 sec. When it reaches step number 7102 coupling step 3, I got the error. It means that structure data is completed till that as i said before but unfortunately I cannot excess the result file. I attach the error and convergence message:
C O U P L I N GS T E PO P T I O N S

STEP NUMBER . . . . . . . . . . . . . . . . . .7102
COUPLING ITERATION. . . . . . . . . . . . . . .1
TIME AT END OF THIS STEP. . . . . . . . . . . .7.1020
TIME STEP SIZE. . . . . . . . . . . . . . . . . 0.10000E-02


*** FORCE SUM ACROSS TARGET INTERFACE . . . . .Fluid Solid Interface (FSIN_1)
RECEIVING FORCE FX SUM =0.13054
RECEIVING FORCE FY SUM = -0.76329E-01
RECEIVING FORCE FZ SUM =0.33226E-02

FORCE CONVERGENCE VALUE=0.1769E-01CRITERION=0.4916E-02
DISP CONVERGENCE VALUE=0.1191E-04CRITERION=0.2984E-02 <<< CONVERGED
EQUIL ITER1 COMPLETED.NEW TRIANG MATRIX.MAX DOF INC= -0.1191E-04
FORCE CONVERGENCE VALUE=0.1255E-04CRITERION=0.5017E-02 <<< CONVERGED
>>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION1
*** LOAD STEP7102SUBSTEP1COMPLETED.**** ITER =23859
*** TIME =7.10200TIME INC =0.100000E-02

*** AVERAGE DISP INCREMENT ACROSS SOURCE INTERFACE. Fluid Solid Interface (FSIN_1)
AVERAGE SENDING DISPLACEMENT INCREMENT DX =0.16047E-05
AVERAGE SENDING DISPLACEMENT INCREMENT DY = -0.10428E-05
AVERAGE SENDING DISPLACEMENT INCREMENT DZ = -0.47876E-05

COUPLING ITERATION. . . . . . . . . . . . . . .2

*** FORCE SUM ACROSS TARGET INTERFACE . . . . .Fluid Solid Interface (FSIN_1)
RECEIVING FORCE FX SUM =0.13022
RECEIVING FORCE FY SUM = -0.76177E-01
RECEIVING FORCE FZ SUM =0.32750E-02

FORCE CONVERGENCE VALUE=0.1769E-01CRITERION=0.4916E-02
DISP CONVERGENCE VALUE=0.1191E-04CRITERION=0.2984E-02 <<< CONVERGED
EQUIL ITER1 COMPLETED.NEW TRIANG MATRIX.MAX DOF INC= -0.1191E-04
FORCE CONVERGENCE VALUE=0.1228E-04CRITERION=0.5017E-02 <<< CONVERGED
>>> SOLUTION CONVERGED AFTER EQUILIBRIUM ITERATION1
*** LOAD STEP7102SUBSTEP1COMPLETED.**** ITER =23860
*** TIME =7.10200TIME INC =0.100000E-02

*** AVERAGE DISP INCREMENT ACROSS SOURCE INTERFACE. Fluid Solid Interface (FSIN_1)
AVERAGE SENDING DISPLACEMENT INCREMENT DX =0.15978E-05
AVERAGE SENDING DISPLACEMENT INCREMENT DY = -0.10395E-05
AVERAGE SENDING DISPLACEMENT INCREMENT DZ = -0.47887E-05

COUPLING ITERATION. . . . . . . . . . . . . . .3

*** ERROR ***CP =10938.422TIME= 12:10:27
The system coupling service error notification: Error reading
Attribute[Levels Name]

For me the problem is to excess the result file from Ansys Mechanical.
Thanks
Tayyaba

[Sheldon Imaoka]

Hi Tayyaba In Mechanical, under 'Analysis Settings' and "Output Control", there is an option to specify how frequently to store results. Storing results at all time points may result in a large result file, but it allows you to have all intermediate results available.
If you search in your Workbench project directory, do you find any files with file extension ".rst"? If the file is small, you may need to set the above setting and re-run the simulation since no intermediate results may be stored. If you do have a large .rst file, you can read in the results by selecting the "Solution" object in the Tree Outline and, from the Solution Ribbon, select "Read Result Files". You can then navigate to the folder containing the .rst file from the solution.
Regards Sheldon

[Tengfei ZHANG]

Hi, Sheldon:

I were faceing similar situation in a recent simulation work, your suggestion to "read result files" helped me a lot.

Thanks,

Tengfei

[tayyaba.bano]

Hi Sheldon Thank you very much for your reply.
I already tried to open the result file in ANSYS Mechanical and it says:
'An unknown error occurred during solution.Check the Solver Output on the Solution Information object for possible causes.'
and when I try to open the result file in CFD Post, It says:
"Failed to make geometry for domain 'Default Domain'

I failed to understand the problem with result file . :(

Kind Regards
Tayyaba

[Sheldon Imaoka]

Hi Tayyaba How large is the .rst file? If it is very small (few KB), then there may not have been any results written to the .rst file, which explains the errors you noted. In that case, you would need to follow the instructions noted earlier to specify storing results at all intermediate time points and re-run the simulation.
Regards Sheldon