Step

2D

Figure 1 and Figure 2 show pressure and velocity results in the 2 dimenions case.

Pressure 2D
Figure 1. Pressure along the pipe.
Velocity 2D
Figure 2. Velocity along the pipe.

FreeFem algorithms in 2 dimensions

  • Step 2D

  • Steady Stokes / Steady Stokes Uzawa

  • Unsteady Stokes / Unsteady Stokes Uzawa

  • Unsteady Navier-Stokes / Unsteady Navier-Stokes Uzawa

Recirculation

Increasing the input velocity, recirculation appears in the step, Figure 3

Vortex
Figure 3. Recirculation in the step.

FreeFem algorithms

  • Step 2D

  • Unsteady Navier-Stokes