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Old   October 2, 2003, 09:24
Default PC for CFD
  #1
Eldoret
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Hi all,

Could some one please just recommend the type of PC that that I need for a multiphase (Gas,solid, liquid) simulation. So far the only information I have is that the PC should have at least: -17" screen, -1 GHz processor speed, -1 GB RAM, -30 GB HDD

Some additional advise please....

thanks, Eldoret
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Old   October 2, 2003, 10:04
Default Re: PC for CFD
  #2
strudl
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It depends on your mesh size is. The rule of thumb is: 1 million Mesh = 1 Gb of ram, of course the the faster your procesor speed the better.
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Old   October 2, 2003, 11:36
Default Re: PC for CFD
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Robin
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Hi Eldoret,

You may as well get as much RAM as the PC will take. I also recommend getting a high quality PC, don't go cheap. A CFD solver is a demanding application and will burn out cheap motherboards. Furthermore, the solver is very memory intensive, which means that RAM and a memory bus speed will have a significant effect on overall performance. Error checking RAM is also recommended.

Lastly, get a decent graphics card. For OpenGL performance, the nVidia cards seem to perform well, but most high end cards will do.

There is a good discussion of this on the CFX Community Forum. If you are a licensed CFX user, you can gain access to the forum from the CFX Community Site.

Regards, Robin
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Old   October 3, 2003, 03:31
Default Re: PC for CFD
  #4
Eldoret
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Hi Strudl, I am thinking of putting in 2GB RAM because i want to have as many cells as my computer can allow. Preferably 300,000 cells and above. My current budget is about US$2500.

Robin, Yes, I have an access to the Site, I will check it out.

Many thanks. Eldoret
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Old   October 3, 2003, 08:56
Default Re: PC for CFD
  #5
jon
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By the way, the rule of thumb for the CFX5 solver is NOT 1 Gb for 1 million cells it is:

400Mb for 1 million cells

For single phase 2-eqn turb model.

For (inhomogeneous) Eulerian flow multiply that figure by the number of phases.
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Old   October 3, 2003, 09:08
Default Re: PC for CFD
  #6
strudl
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Jon The mesh/ram ratio was given to me by CFX-UK, I am using CFX for my Ph.D research, beleive me I have had to halve my models just to get by on a 3.65Gb Ram computer, I have had a simultion going on for 7 days, swapping with the hard drive.
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Old   October 3, 2003, 10:17
Default Re: PC for CFD
  #7
jon
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Strudl,

Thats is as maybe, but trust me, its correct.
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Old   October 3, 2003, 10:18
Default Re: PC for CFD
  #8
strudl
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Jon,

OK then.
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Old   October 3, 2003, 16:14
Default Re: PC for CFD
  #9
Robin
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Actually, memory usage is very grid and physics dependant. There is no universal rule of thumb.

-Robin
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Old   October 6, 2003, 04:25
Default Re: PC for CFD
  #10
Eldoret
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Hi all,

allow me to make a do loop here: .._GO TO_. Rao's & Strudl's latest posts on "Memory Problem in Solver".& "Memory alocation", respectively.. _IF_ .....<...>

_END_
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Old   October 19, 2003, 14:28
Default Re: PC for CFD
  #11
Bill
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You should try doing a PhD with only 256mb of memory!
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