Just to add to Vinayak's answer, there is a physical timescale associated with any problem. In order to capture the physics correct, you will need to use a time step lower than this time scale. As long as you are mindful of this, and of course, the CFL condition based on the mesh size, you can continue to increase your timesteps. If you use a time-step larger than what the CFL condition prescribes, then your simulation will diverge.
I hope this helps.
Please Login to Report Topic
Please Login to Share Feed
New Post - Reply To: Is increasing the time step affect the results accuracy in Fluent?