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Old   January 11, 2021, 12:55
Smile Ansys fluent hyperthreading
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Spiros Kouzoupis
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Hi,

I want to know, i have an Intel i7 8700k 6 cores 12 threads, now i use ht on, my cpu works 100% when i run my simulation. In UI in ansys fluent i put 12 cores (meaning 12 so i can tell fluent that there are 12 logical cores) and 1 gpu. Would it run faster if i turned off ht and so put 6 cores and 1 gpu? Also would help to upgrade to i9 9900k?
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Old   January 20, 2021, 11:16
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Erik
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Why not try turning off HT and see for yourself?
Both those CPUs only have 2 memory channels, so i suspect you are memory bandwidth limited, not CPU limited, and there would not be too much difference between the CPUs, as it won't scale well past a few cores anyways. I would pick up a CPU with at least 4 memory channels, which would be roughly 2x the speed of your machine. CFD is usually memory bandwidth limited.
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Old   January 20, 2021, 13:11
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Spiros Kouzoupis
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I switched off ht, but because other problems i cant compare the result in time. Every simulation cost me 1 month, if i want to compare i have to run the same simulation 2 times, so 2 months at least. Also ansys sometimes crashes by it self so its not possible to compare. Im Just asking by techincal point of view.
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Old   January 21, 2021, 13:57
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Hi,
for 2D pipe flow, we useTb (bulk temperature) formula,
lengthInt(Velocity u*Y*Temperature)@radial/ lengthInt(Velocity u*Y)@radial
How to put the formula in comment mode to find results?
Please help
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