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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › HET_RXN_RATE UDF › Reply To: HET_RXN_RATE UDF

January 6, 2025 at 5:29 pm
sjohn
Subscriber

My current model uses 864k cells to get things going but I have created mesh with 2-8 million cells that I can use to fine tune. I also have access to HPC.

I am hoping to model spray structure, heat transfer and chemical species formation using VOF with hereteogeneous UDF.

I have seen literature where Eulerian with heterogeneous UDF was found to be unstable for Fluent 16.2:

"Through these simulations it was concluded that with the setup used in this simulation
it is not possible to simulate the fluid flow in a monopropellant rocket engine in ANSYS
Fluent 16.2 due to stability issues connected to the Eulerian multiphase model and by
enabling the heterogeneous reaction model modelled in the mixture multiphase model."