CFD Online Discussion Forums

CFD Online Discussion Forums (
-   FLUENT (
-   -   Unsteady flow phase shift (

fuat October 31, 2008 04:20

Unsteady flow phase shift
I am trying to solve a pulsatile flow problem with a familiar udf (sin wave velocity profile)using Fluent6.3. Boundary Conditions /Velocity Inlet: Udf with negative velocity so infact velocity outlet. /Pressure out: Patm/ time step: 0.0005 s/ Period: 0.5 s/ I am both using the pressure solver with 2nd order implicit unsteady formulation and NITA. I got a converged solution, with the same pressure drop curve as the experimental data but with some phase sfift.

I am taken pressure drop at three different places (y:at wall for all places x: 6.3m, 6.2275m, 6.3725m) and all is the same pressure curve there is no phase shift between them. However one period is completed 0.3m.

Any suggestions, to solve the problem

Thanks for now

All times are GMT -4. The time now is 02:18.