Example 5: 2D Cylinder

The fifth example of this tutorial analyses a case of two-dimensional flow passing a cylinder in the low Reynolds range.

We choose a Reynolds number of Re = 100, for which we expect a vortex street in the wake of the cylinder (the well known von Kármán vortex street).

As in the two previous examples the geometry consists of a box that represents the control volume, which contains the body to be studied in this case the circular cylinder.

-         Flow passing a cylinder

-         Viscous, turbulent case

-         Reynolds number of 100

The Reynolds number is calculated as in the cavity flow example. In this case we chose for the characteristic length of the problem, L, the diameter D of the cylinder.

The example's parameters are

-           D=1              (m)

-           v=1               (m/s)

-           r=1              (kg/m3)

-           h=1 10-2       (kg/m.s)

This gives

Re = 100