May 19, 2022 at 9:39 amfruswritSubscriber
I have to perform 160 harmonic simulations with varying Young modulus, Poisson, density, stiffness and mass coefficients. To do that, I have an script that reads from a text file and assign to parameters. Then I run Ansys with the script from a Batch script loop. I use interactive mode while calling Ansys, to maximize compatibility and reduce potential errors.
With those scripts I succesfully ran a previous test of 16 simulations with all the parameters but the density (4 parameters). After adding the density, however, I get the "An unknown error occurred" message. After checking the log, there is no error.
/COM,ANSYS RELEASE 2021 R1 BUILD 21.1 UP20201109 08:50:39
*** WARNING *** CP = 2.359 TIME= 08:50:52
Element shape checking is currently inactive. Issue SHPP,ON or
SHPP,WARN to reactivate, if desired.
*** WARNING *** CP = 2.812 TIME= 08:50:52
Material number 3 (used by element 72853) should normally have at least
one MP or one TB type command associated with it. Output of energy by
material may not be available.
The log just stops at:
Range of element maximum matrix coefficients in global coordinates
Maximum = 5.42640519E+10 at element 5946.
Minimum = 6611959.72 at element 73145.
*** ELEMENT MATRIX FORMULATION TIMES
TYPE NUMBER ENAME TOTAL CP AVE CP
1 21528 SOLID187 11.094 0.000515
2 36828 SOLID187 17.922 0.000487
3 757 SURF154 0.422 0.000557
4 3 CLOAD201 0.000 0.000000
7 3 CLOAD201 0.000 0.000000
Time at end of element matrix formulation CP = 13.4375.
*** NOTE *** CP = 15.828 TIME= 08:50:57
The initial memory allocation (-m) has been exceeded.
Supplemental memory allocations are being used.
I have been monitoring RAM usage, with like 30 GB used. But I have 64 GB RAM, and no other process open. Task manager says I have like 14 GB free.
There has been no antimalware updates that I know of in my computer.
If I run the case without the distributed box checked it also crashes. If I run it with 2 processors, it also crashes. However, If I run it only with 1 processor it does go through.
However, it would be quite faster to do the simulations with the 4 cores.
Any clues? Thank you in advance!May 19, 2022 at 12:15 pmAshish KhemkaAnsys Employee
Did this happen only once? In case you start a new session and run the script with density then do you see a similar error message? Please let us know.
Regards Ashish Khemka
May 20, 2022 at 6:59 amfruswritSubscriberNo, it is not dependent on whether I open it from scratch or not. It will consistently happen if it fails. No error, and no differences in the Solution Output.
However, I think I fixed it (kind of) by changing 4 things at the same time: setting Variational Technology to No, Contact Split to Off, writing DB to On and (perhaps more importantly?) getting it not to erase unnecesary files.
It is kind of buggy, and I have absolutely no clue why it is working sometimes and not others, but I will try with this setup and check if it runs.
May 20, 2022 at 8:36 amAshish KhemkaAnsys EmployeeThanks for the update. Please let us know how it goes at your end.
Regards Ashish Khemka
May 25, 2022 at 7:49 amfruswritSubscriberHi,
Just to bring some closure for others potentially experiencing this, I changed one other thing: I was running the simulation in a shared net partition, I changed that to the internal memory storage of my working station.
I am 35 simulations in and everything works as it should, so I think case closed on my end.
Thanks for everything
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