[mlsk]

Dear CFD-Online community,

I hope this message finds you well. I am currently working on a transient heat transfer simulation using OpenFOAM. The simulation involves a transonic flow over an airfoil, and I am facing challenges related to excessive Courant numbers leading to extremely small time steps.

I have attempted the following troubleshooting steps:
1. Adjusted numerical parameters in the fvSchemes and fvSolution files.
2. Checked and modified boundary conditions where necessary.
3. Reviewed and adjusted relaxation factors in the fvSolution file.
4. Verified mesh quality and refined where needed.

Despite these efforts, the simulation's deltaT has reached an extremely small value (e.g., 2.7686277e-47), causing the simulation to stop. The Courant Number mean is within acceptable limits, but the pressure and time step issues persist.

I would greatly appreciate any guidance or insights from the community on how to address these challenges. Specifically, any suggestions regarding adjusting numerical parameters, modifying boundary conditions, or optimizing the simulation setup would be immensely helpful.

Thank you in advance for your time and expertise.

Best regards,
MLSK