CFD results

[SHarun]

why are the velocities on the graphs dependent on time in a steady state air?

[goncalves]

Hi @SHarun,

Thanks for posting your question!
Please find the answer for your question in the post down below. The answer is concerning the Cd graph, but the explanation is the same for another quantity (e.g.: velocity graph, cl, and so on).

Drag Coefficient Calculation

Hey, Are you talking about transient analysis? That’s the only case where Cd is given with respect to time. For steady-state, “time” doesn’t mean time in seconds. It means iterations (simulation is an iterative process). The only “real” Cd would be the coefficient in a fully converged result set. For example, in this steady-state analysis, the Cd values in the ellipse have no meaning. The value that really matters is the last one: [image]

Please let us know if this is helpful in your understanding.

best,