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In GAMBIT meshing, Out of Memory! ?

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Old   October 24, 2008, 10:33
Default In GAMBIT meshing, Out of Memory! ?
  #1
Conan
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When I try to mesh about 5 million mixed cells in GAMBIT 2.4.6, it always says "Error: doee not allocate *** types for dynamic memory, Error:Out of Memory".

My PC is 64-bit Window-XP with core 2 CPU @3. 00 GHz and 3.00GHz, 8 GB of Ram. I think it is strong.

What shall I do? How much it need for 5 million cells ?

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Old   October 24, 2008, 10:38
Default Re: In GAMBIT meshing, Out of Memory! ?
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Conan
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just about 5,000,000 cells for turbulent computations
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Old   October 24, 2008, 16:10
Default Re: In GAMBIT meshing, Out of Memory! ?
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For 5 million cells the system should be supported with 5 GB of RAM. I think you have no hardware RAM issue unless the cells exceed 8 millions. My advice is to try to lower the number of cells to the level where the meh can be generated.
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Old   October 24, 2008, 17:58
Default Re: In GAMBIT meshing, Out of Memory! ?
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Rajesh
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I was able to generate meshes... with 7.2 million cells on a Dell pentium 4 processor with 3 Gb of RAM. the problem should be something specific to gambit... inspect the geometry closely and also the type of volume meshing you are using to create a mesh.

RAM issues will arise when you are running computations in FLUENT with less memory for the number of cell you have. approximately 1 ~ 1.2 kb/cell of memory will be used for computations in FLUENT. It increases with increase in the number of equations to be solved.
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Old   October 25, 2008, 14:49
Default Re: In GAMBIT meshing, Out of Memory! ?
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Interesting, thanks for sharing the Dell experience.
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Old   October 26, 2008, 10:58
Default Re: In GAMBIT meshing, Out of Memory! ?
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Conan
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but the computations are expected in high resolution, the grid should be finer as possible.

is the 32-bit GAMBIT a problem?
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Old   October 27, 2008, 09:31
Default Re: In GAMBIT meshing, Out of Memory! ?
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Conan
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since there no 64-bit GAMBIT in markets, I have to install 32-bit GAMBIT in my 64-bit Windows system. So,

I am wondering if the 32-bit Gambit has to utilize only 3G of RAM.....
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Old   November 10, 2008, 05:02
Default Re: In GAMBIT meshing, Out of Memory! ?
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TigeRIK
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As you know, There is still no 64bit ver. Gambit. therefore the Gambit is using only 3GB memory. I recommend that you use the Tgrid. There is 64bit Tgrid. You are able to use the all memory. Good luck! Conan.
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