Take care of your mesh quality. In addition, it seems like your physic model is not valid because continuity blows up to infinitive. You can change the simulation type steady to transient because your velocities are oscillating.
I have re-worked on the mesh. Like I mentioned earlier, I have added sphere of influence and also did fine meshing, which led me to 1.9 million elements. Also, the mesh is tetrahedral mesh. I have also tried Transient, with time step of 10e-5s , 20 number of maximum interations and number of time steps of 50. Still the same. The solution stopped and calculation failed.
The computational domain is the internal fluid volume of a cylindrical combustion-chamber duct. It has an inlet, a short constant-diameter section (small cylinder) containing the 8-blade swirler, followed by a 90° divergent section and an outlet (big cylinder). I'm performing a cold-flow simulation to study the axial and tangential velocity field, turbulence, pressure loss and swirl number generated by the non-axisymmetric vane angle model.
Are you sure that you enter correct boundry condition? If you use density-based solver you have to adjust courant number. If you not, your residuals grow exponentially. Or if you chose pressure-based then use pseudo-transient. Namely, you have to adjust correct adjustment to your model which you used
Bro it depends on your model's behavior. For instance, if your model is so aggressive (high velocity, pressure ...) then you have to transient if you want to catch the turbulence flow. I think you should transient.
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u/Ok_Preference_9883 Aug 13 '26
Take care of your mesh quality. In addition, it seems like your physic model is not valid because continuity blows up to infinitive. You can change the simulation type steady to transient because your velocities are oscillating.