AnsweredAssumed Answered

FloWorks crashing regularly with simple models

Question asked by 1-1NHKU5 on Jul 21, 2008
Latest reply on Jul 24, 2008 by 1-1NHKU5
My VAR tells me that I need a 64bit machine. I am not convinced. I think there's a bug in FW --like a memory leak-- that is causing this.

Here's what I have:

Cells: 100K to 300K
Simple fan-driven thermal simulation of a heatsink.
It's a shrouded heatsink, so flow is internal.
Heatflow in solids enabled.
Only one material: aluminum
Fluid is air.

Dual core Pentium 4, 3.2GHz
4GB RAM
NVidia 1700 card
16GB page file
No antivirus or any such software

I am running a model with 10 to 20 different configurations.
All configurations are driven from sketches at the top assembly level.

I setup the batch solver to run overnight.
The results are never loaded between runs.

It will run a few configurations (anywhere from one to five) and eventually either crash or stop, claiming that it doesn't have enough memory. One time it stopped because it claimed that it could not allocate 4,096 BYTES!

When I have monitored the machine (it takes two to three hours per run, so I don't do this very often) to see what was going on, there was always plenty of memory available.

I've run it with both the 3GB switch on and off. Same results.

I've run it using one or both processors. Same results.

In general terms, configurations that crash tend to run just fine outside of the batch solver.

If I had to guess I'd say that what is needed is the ability to have a one minute pause between batch runs in order to allow the OS to do a little memory cleanup. Conjecture on my part, but it may be well founded.

Thanks,

-Martin


Outcomes