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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › RPI Model Diverges at high superheats › Reply To: RPI Model Diverges at high superheats

October 9, 2024 at 7:15 am
zain.qazi
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The mesh is quite coarse near the wall. The y+ for the vapor phase starts at 30 and goes upto 120, increasing along the channel. The domain is a straight channel with solid and fluid zones with a hexahedral mesh, uniform, no inflation layers, aspect ratios very close to one in the cross section. 

I’m using Psuedo Time Step Method – Global Time Step and the Time Step Method has been set to Automatic with a Time Scale Factr of 1. This is a steady state simulation. This method works okay till high heat is introduced as I stated above. Why do you think this happens and how do you advise me to change it?

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