I think your question is not well-posed.
The total amount of time needed in VOF computations in Ansys Fluent is strictly related to your CPU, motherboard and RAM.
There is no absolute correspondence between mesh size and CPU core amount; I will give you details about how to choose the right configuration.
Among CPU features, the most important is the number of memory-channels.
In fact, you can have a very high number of cores on your CPU, but still have a bottleneck in your simulations.
CPU with 2, 4 and 8 memory-channels are available on the market:
- Most of Intel CPUs have 2 channels,
- Most Xeon have 4 channels,
- Recently, Epyc has introduced 8 memory-channels CPU. The overall memory bandwith is very high, given the same core amount.
How to deal with possible bottlenecks when choosing a hardware configuration?
You have to match carefully CPU, motherboard and RAM. The communication between these elements must be as fast as possible, to make your simulation scalable.
Let's consider an example: if you plan to have 256GB of RAM on a motherboard with 16 empty slots, and your CPU has 8 memory-channels, then you should put 16x16 RAM blocks (a 16GB block in each RAM slot).
Best regards,
AP
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