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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › Finite Rate – Direct Source Combustion Prediction Issue › Reply To: Finite Rate – Direct Source Combustion Prediction Issue

October 30, 2024 at 10:02 am
Vijay Narayan
Ansys Employee

Hi,

Could you share the following information as this would help in my response:

a) Are you using the FR/ED model or FR/No TCI option under Turbulence chemistry interaction.

b) Have you tried increasing the air temperature to 1800K and check if it is triggering the reaction (just curious).

c) Relax to equillibrium is also kinetics independent and should predict the burned region as against the direct source option (depend on temperature to trigger reactions) 

Refer the below section from 24R2 Ansys Fluent theory Guide for details on Relax to equillibrium

7.1.1.2.7.The Relaxation to Chemical Equilibrium Model

Note: In general, Direct source should be good to use for single step/short chemistries. Stiff chemistry solver is recommended for detailed kinetics.