AcuSolve memory problem

Altair Forum User

Hello everyone,

 

I am currently simulating an entire truck assembly in a wind tunnel environment using the AcuConsole pre processor and AcuSolve solver. I have around three porous mediums in my model along with 18 axial fans (Rotating reference frames) which has blown up the overall element size and also the complexity of the model.

 

When I try to run the model setup in AcuSolve, after the domain has been decomposed, I get the following errors:

 

acuRun: Run acuSolve ...

acuRun: set KMP_AFFINITY=scatter

acuRun: set MP_SET_NUMTHREADS=72

acuRun: set OMP_NUM_THREADS=72

acuRun: set OMP_DYNAMIC=FALSE

acuRun: set MPC_GANG=OFF

acuRun: 'C:/Program Files/Altair/2017/acusolve/win64/bin/acuSolve'.exe -np 1 -nt 72

acuSolve: AcuSolve checked out license from HyperWorks

acuSolve: *** ASSERTION in Function <memAlloc> File <mem.c> Line <129>

acuSolve: *** Unable to allocate <290044352> bytes; already allocated <73318612992>; from file <topSd.c> line <1451>

acuRun: *** ERROR: error occurred executing acuSolve'

acuRun: Wed Apr  4 16:07:48 2018

 

I have tried to change the mesh size and restart my computer but nothing seems to fix this issue. Could anyone provide more insight into this issue? I am also attaching the log file for reference.

From what I can understand, it looks like a problem with my workstation not having sufficient memory to run the analysis. I am running it on a 36 Core (72 logical processors), 64 GB machine.

 

Thanks,
Yatish

 

Unable to find an attachment - read this blog

acupro

Apparently the RAM on the machine is not sufficient to run the problem.  Looks like it's gone through all the physical memory, and into the swap memory, too.  Simplest/cheapest fix would be to get more RAM for the machine if it's not maxed out.  Otherwise, the mesh count (problem size) needs to be reduced.

Altair Forum User

Altair Forum User said:

Apparently the RAM on the machine is not sufficient to run the problem.  Looks like it's gone through all the physical memory, and into the swap memory, too.  Simplest/cheapest fix would be to get more RAM for the machine if it's not maxed out.  Otherwise, the mesh count (problem size) needs to be reduced.

 

Thanks for the input @acupro . I'll try to reduce the mesh count and try it again.

ydigit

Another option would be to define maximum number of elements in AcuConsole. This way the meshing stops after that number is reached. You would of course get an error, but it would avoid the machine hanging or creating a huge mesh that would take too long on your machine.

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