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How to accelerate simulation time

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Old   October 7, 2016, 14:35
Default How to accelerate simulation time
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Peng Liang
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Dear all,

I am now doing plasma-electrode coupled simulation using Chtmultiregionfoam. Due to the high plasma velocity and low viscosity at high temperature i can only run the simulation with a time interval of about 1e-8s to make it converge.

But then there is a very serious problem. To make the thermal conduction inside metal cathode to converge, one needs to simulate till a several seconds, while the plasma temperature already converged at about 0.02s. That means it takes totally 1e8 to 1e9 time steps to see the converged solid temperature results, that will be quite long! May be several years to wait.

Now i wonder if i could make the simulation using the steady state solver such as chtmultiregionsimplefoam. If i am lucky to manage that, will the steady state solver converge faster? As my cfd knowledge is quite limited, i would like to write my problem here waiting for somesone experienced to give me help.

Or is it logic to solve the fluid region by transient solver while the solid region with steady srate solver?

Best Regards,

Peng
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Old   October 9, 2016, 07:19
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Glenn Horrocks
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Please do not post openfoam questions in the CFX forum. I have moved this post to the openfoam forum. Make sure you post on appropriate forums in future.
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