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RAM memory torun 2 million case

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Old   October 18, 2007, 02:40
Default RAM memory torun 2 million case
  #1
rs
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Hi,

I have to run a 2 million case on my machine. The machine is 32 bit with 4GB RAM but I could not able to run this case.

Even though we have 4Gb ram why we were not able to run a two million case?

Do we have any settings in the solver or the OS (windows XP SP2) which makes this run possible?

Your help is greatly apreciated.

Thanks
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Old   October 18, 2007, 14:14
Default Re: RAM memory torun 2 million case
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Harry
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On Windows you are limited to 3 gb per cpu so if the case needs more than that then you will need to run parallel. Also you need to watch for what physics you are using, the more the solver has to solve for the more memory it needs. If you are using STAR-CCM+ or V4 the number of faces in your model will be a consideration, especially if you are using a polyhedral mesh which contains significantly more faces than a hexa or tet mesh.

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Old   October 19, 2007, 04:31
Default Re: RAM memory torun 2 million case
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Anton Lyaskin
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Look for /3GB and /userva=xxx boot parameters at Microsoft internet site - this can help to free more memory for applications and allow an application to use more than 2Gb. Also stop all unnecessary services (do you really need Windows Update or NetMeeting or Print spooler while running a case?). 4Gb should be more than enough for 2 million cells, even if it's turbulent compressible. The only case can be if you have lot's of boundaries, like 1 million or more.
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Old   October 25, 2007, 06:23
Default Re: RAM memory torun 2 million case
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murash-v
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RAM size equal 4 GB is enough for 3.5 million cells with VOF.
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Old   November 17, 2007, 12:53
Default Re: RAM memory torun 2 million case
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azmir
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I'm not so sure... but the 32-bit windows could render your 4Gb RAM to a max of 3Gb effectively. You might have to change to 64-bit to be able to fully utilize the 4Gb.
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Old   November 27, 2007, 04:33
Default Re: RAM memory torun 2 million case
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Airfoil
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Try to compress all. I mean compress cell number, boundary and etc. You find this function in the tool menu. Hope this will help. Otherwise, as Azmir said, use XP 64 bit. I encourage you to use Linux 64bit.
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