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Outlet Pressure Increasing Resulting in Reverse Flow

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Old   May 22, 2023, 15:35
Default Outlet Pressure Increasing Resulting in Reverse Flow
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Lucas Cavalcante
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Hey all,

I am fairly new to Ansys and trying to simulate a simple heat exchanger as part of a project.

I have the inlet conditions set as pressure inlets and the outlet conditions set as mass flow outlets. The goal of the project is to design a heat exchanger which minimizes the pressure drop of the hot side. I know the inlet pressure and figured it would be best to find what the simulation estimates the outlet pressure to be.

The problem I am running into is that the hot side outlet pressure keeps diverging, much higher than the inlet pressure resulting in a reverse flow (400 bar vs 20 Bar). Any idea how to remedy this?

My mesh seems pretty good with an average skewness of 0.00196 and average orthogonality of 0.97336. I have also tried specifying "prevent reverse flow" but this led to a decreasing outlet pressure initially, as expected, and then a drastic increase.

Feel free to ask for more clarification.
Thanks for the help!
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convergence issues, divergence in fluent, fluent - parallel

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