[CaptainCombo]

Hi,


I am simulating flow (Re = 525) in a channel that it's upper wall is grooved, it's length is 1.2m and the gap between upper and lower walls is 2.32cm. I made channel width 2.5mm and applied periodic boundary conditions in spanwise directions. Almost 5M hexa mesh was used for this geometry. LES (with dynamic stress) was employed for turbulence modeling. Time step size was equal to 0.0001. My purpose in using LES was to see the change of the instantaneous flow field in time but obtained the same flow field data at every instant. Also, I monitored velocity data at different points and it stopped to change remained constant after a while.


Can you give me some advice? What do you think he problem is?