{"id":318854,"date":"2023-11-21T15:03:19","date_gmt":"2023-11-21T15:03:19","guid":{"rendered":"\/forum\/forums\/topic\/two-temperature-model-problem-with-ansys-fluent-21-r2\/"},"modified":"2023-11-22T07:50:57","modified_gmt":"2023-11-22T07:50:57","slug":"two-temperature-model-problem-with-ansys-fluent-21-r2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/two-temperature-model-problem-with-ansys-fluent-21-r2\/","title":{"rendered":"TWO TEMPERATURE MODEL PROBLEM WITH ANSYS FLUENT 21 R2"},"content":{"rendered":"

I am using Ansys Fluent 21 R2 to solve a hypersonic problem in a nozzle that involves the chemical reaction model (5 species park 93 model already implemented in the software) and thermofluid dynamics.
Starting from the simulation with reactions enabled (volumetric yes) and eulerian flow, I subsequently also enabled the two-temperature model (from the energy box) to evaluate the molecular vibrational effects (O2, N2, NO), in fact, only in this case after a few iterations suddenly a problem occurs convergence which causes a residue explosion<\/p>\n

The problem seems related to the activation of two temperature model in the region where the Mach number is greater than 4.5, this causes a small problem in my nozzle simulation because where mach is high the temperature is low and vice versa. Can you confirm that the activation of the two-temperature model to evaluate the vibrational effects is related to the Mach number? How can I change this relationship because I’m interested in activating the two temperature model using temperature?<\/p>\n

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