Reduction in time step leads to divergence of velocity
Posted: Mon Feb 11, 2019 10:00 pm
Hi all,
I have puzzling problem. If i reduce the time step for my LES simulations the velocity diverges. If increase the time step back to its original value (2e-4), no divergence occurs and I can get past the point where the solution diverges with the smaller time step. I want to reduce the time step as the instantaneous cfl number goes above 1 (maxes out at around 2) with the original value.
I am using Code-Saturne 5.2.0 and I have attached the xml, listing files and subroutines for the simulation which diverges.
Any advice you can give would be much appreciated.
Kind regards,
Kenneth
I have puzzling problem. If i reduce the time step for my LES simulations the velocity diverges. If increase the time step back to its original value (2e-4), no divergence occurs and I can get past the point where the solution diverges with the smaller time step. I want to reduce the time step as the instantaneous cfl number goes above 1 (maxes out at around 2) with the original value.
I am using Code-Saturne 5.2.0 and I have attached the xml, listing files and subroutines for the simulation which diverges.
Any advice you can give would be much appreciated.
Kind regards,
Kenneth