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interFoam Simulation speed and convergence graph

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Old   April 12, 2022, 04:34
Smile interFoam Simulation speed and convergence graph
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Hi everyone!

I can be counted as new to OpenFOAM and have been working on various setups for a ship flow simulation using interFoam. I need help with convergence scheme(graph) and simulation time.

I have uploaded a gnuplot convergence graph picture, the duration for this amount of process takes about 2 days. When you compare the case to other software on same hardware (such as Numeca) it is very very slow(numeca gets results in 4-5 hours). Is this something natural for OpenFOAM or am i somehow using very high precision tolerance values?

Also in numeca convergence graph plots about three big up&down wave curves and then starts an obvious convergence interval and repeats it, so you are sure that your simulation has converged to a value. But with interFoam i never get that obvious convergence plot (maybe i need weeks for it in current solver settings).

I can share my OpenFOAM dictionaries (didn't do it now due to lack of knowledge about which ones you need to know).

-I am generally having around 3.5million mesh cells
-Using 5 or 6 topoSet dictionaries for refinement

The hardware I use:

* 2 x Intel Xeon E5-2630-v3 @2.40GHz (total 16physical cores)
* 128Gb Ram
* 1TB NVMe M.2 SSD 3300mb/s read, 2800mb/s write (connected via PCIe card)

**Also when i check processor state it always runs in base frequency, is there any way to get cores to turbo frequency?

Any help appreciated
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convergence, interfoam, openfoam, simulationtime

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