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rbrooks1-Visitor
1-Visitor
September 30, 2013
Question

What do you do when your model reaches Simulate's 16Gb limit

  • September 30, 2013
  • 3 replies
  • 9434 views

ANybody know what can be done when the limits of Creo's capabilities are reached?

I have a large assembly which I need to do dynamic analysis on. Unfortunately the modal analysis fails because it requires more memory than simulate can handle and it stops the analysis with a "fatal error".

Unfortunately I have been given the job of analysisng how bolting these assemblies together increases their strength so any improvements I make by simplifying the assemblies will be quickly wiped out.


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3 replies

D
DenisJaunin15-Moonstone
15-Moonstone
October 1, 2013

Hello, Richard,

You can simplify your parts, removing the shelves, chamfers and other inutils details.

Can you use the symmetry function.

Cordially.

Denis.

D
DavidMalicky1-Visitor
1-Visitor
October 4, 2013

Good advice from Denis. Also if you are using mesh controls, shoot for larger elements where appropriate. Max element size controls on surfaces and edges are much thriftier than on components and volumes. Also consider using shell and beam elements where appropriate.

Almost any complex model can be simplified for the purpose of obtaining meaningful FEA results. Some details matter, most don't. Figuring out which is which takes either experience and/or a number of smaller trial models.

EDIT: Also try AutoGEM > Geometry Tolerance > Increase the 0.0001 defaults to something larger. That will auto-smooth fine details.

Message was edited by: David Malicky

S
sdensberger2-Explorer
2-Explorer
October 15, 2013

What do you mean by "Simulate's" 16 Gb limit? I've run models that have gone upwards of 40 Gb. What is your SOLRAM set to? How much memory does your machine have? How much virtural memeory do you have set aside for your machine?

    P
    ptc-9699351-Visitor
    1-Visitor
    October 23, 2013

    Shaun,

    I have 128 GB available on my 64bit machine and 2 2.7 GHz processors. I have tried to increase my solver settings memory allocation box to anything above 16GB and get the error "The maximum memory allocation (solram) is 16384 MB.". I went into my config.pro settings and found the "sim_solver_memory_allocation" parrameter and set the value to 65536. And I still get the error. I can't find a "solram" parameter anywehre. Any Ideas?

    Thanks

    Jesse

    D
    danderson1-Visitor
    1-Visitor
    October 24, 2013

    Jesse,

    You are correct, There is a 16gb Solram limit in Creo Simulate. Prior to Creo Simulate if I remmember correctly it was 8gb in Wildfire 4 and earlier.

    I know PTC is looking into expanding the limit for a future release of Creo Simulate.

    Not sure if you have tried taking part of you physical ram and tried turning it into a RAM Drive to handle the temp files Simulate creates to try to speed things up?

    Hope this Helps,

    Don Anderson

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