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#1 |
New Member
Spiros Kouzoupis
Join Date: Jan 2021
Posts: 10
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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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#2 |
Senior Member
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 1,188
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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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#3 |
New Member
Spiros Kouzoupis
Join Date: Jan 2021
Posts: 10
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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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#4 |
New Member
Join Date: Jan 2021
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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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#5 | |
Super Moderator
Alex
Join Date: Jun 2012
Location: Germany
Posts: 3,427
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Quote:
But with a run time of 1 month ![]() Maybe the cell count is so high that the simulation does not fit in memory. In that case, you would need more RAM. And better CPUs than a mainstream 6-core processor. Maybe it's because your simulation runs a very high number of iterations/time steps. In which case there is not much you can do about it from a hardware perspective. Careful evaluation of the simulation parameters is the better approach here. Or maybe your simulation does a lot of file-I/O, some of which might be unnecessary. Here a faster storage solution might help. Tell us more about the simulations you are trying to run. |
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