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convergence issues in gas-solid flow simulation in Fluent

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Old   July 21, 2017, 06:20
Default convergence issues in gas-solid flow simulation in Fluent
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Santosh
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I am trying to simulate gas-solid two phase flow in an 2D axisymmetric vertical pipe using two fluid model approach of Ansys fluent. I am using the granular PDE for the solid phase. As per the fluent manual first I am simulating the single phase (air) and then switching to two phase. Single phase simulation is converging properly; the mass flux criterion is also being satisfied. However the moment I switch on the solid phase the residual of granular temperature equation is not falling below 10^-03 and then the residuals of solid phase momentum are also causing problem even with a time step of 10^-06.

Any Help?
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Old   November 11, 2018, 16:42
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Muhammad Ali Uzair
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Quote:
Originally Posted by SKS13 View Post
I am trying to simulate gas-solid two phase flow in an 2D axisymmetric vertical pipe using two fluid model approach of Ansys fluent. I am using the granular PDE for the solid phase. As per the fluent manual first I am simulating the single phase (air) and then switching to two phase. Single phase simulation is converging properly; the mass flux criterion is also being satisfied. However the moment I switch on the solid phase the residual of granular temperature equation is not falling below 10^-03 and then the residuals of solid phase momentum are also causing problem even with a time step of 10^-06.

Any Help?
Thanks
Hi SKS13
I am facing the same problem with PDE for granular temperature. The simulation diverges. If you solved the problem, could you please guide me.
Best
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