[dxb]

The general solver and model settings I'm using are:
• Fluent 2021 R2
• Density-Based Solver, Steady-State
• Energy Equation On
• Two-Temperature Model
• k-w SST Turbulence Model
• Discrete Ordinate Radiation Model
• Species Transport, Volumetric Reactions, air-2species-nitrogen, Finite-Rate/NO TCL
• Pressure far Inlet,pressure Outlet BCs, Wall BCs
• Boundary Turbulence Specification: I = 0.05%, Turbulent Viscosity Ratio = 1.0
• Calculating in Absolute Pressure (0 Pa Operating Pressure)
• AUSM Gradient Method
• All equations first order
• Solution Steering - Hypersonic, FMG Initialization
• Courant Number:0.1-1-5-10;
When not open species reactions modle,it convergenced;after open reactions modle,it not convergence and "Divergence detected in AMG solver: TWOTE-eq Error at host: floating point exception".
If you have some tutorials or experiences, please help me solve this problem,thank you.