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Nevel February 2, 2010 08:36

Small cluster configuration for pump simulation at CFX
Dear colleagues,
could you please recommend a configuration of workstation or small cluster for pump simulation at CFX?
The pump is centrifugal and single-stage with volute and diffuser.
Steady-state (frozen rotor) and transient simulations.
Combination of hexa and tetra/prism meshes.
Whole model number of cells is about 8 millions.
Required time for 1 iteration is about 100 seconds.
I located this thread at hardware forum but gave no answer, so I hope you can advice something.

Thanks a lot for your replies!

ghorrocks February 2, 2010 18:08

Get as many parallel licenses and computers as you can afford. The more you get the quicker it will go. If you are on a commercial license spend your money on top-of-the-range CPUs (like the intel X5570). If you are on an academic license it may be worth considering lower spec CPUs but more of them.

As for designing a system to complete simulations at a given speed - well, you will have to benchmark that yourself. But 1 iteration in 100s does not sound very fast. You should be able to achieve this.

Nevel February 3, 2010 09:31

Thanks Glenn.
What do you suppose about number of these processors?
Is speedup curve close to ideal one for real turbomachinary simulation with 8, 16, 32 nodes (not for only benchmarks)?

ghorrocks February 3, 2010 23:37

The optimum number of processors depends on factors including budget, uptime requirement and maintenance of clusters. These are things you have to judge for yourself.

A real turbomachinery simulation with several million nodes or more should scale pretty well to 8 and probably 16 processors. For 32 and higher processors you will probably need to consider more upmarket networks like Infiniband. But really you need to benchmark all this stuff yourself on your simulation.

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