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accelarate simulation using steady state solver

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Old   October 7, 2016, 15:42
Default accelarate simulation using steady state solver
Peng Liang
Join Date: Mar 2014
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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 untill 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 till convergence in solid.

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 logical to solve the fluid region by transient solver while the solid region with steady srate solver?

Or could i simulate it with transient firstly till fluid region convergence and then turn to steady solver till solid region convergence?

Best Regards,

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