A rotating
cylinder in a parallel flow is a relevant problem to work on before using
complex geometry. We have created a basic grid since the aim of this work
was to focus on the sliding mesh method. Of course the next step would
be to improve it.

We apply
the same method as previously:

\

As the geometry
is no more only cylindrical, it is easier to create the grid with GAMBIT
and then to export it.

Note that
a cylindrical part need to be created in order to use the sliding
mesh technique.

The boundary
conditions are defined as shown in the following figure. The interface
between the cylindric part and the other part must be defined as Attach.
The wall cylinder wall rotates at a speed of 300 rpm and the velocity inlet
is set to 1 m/s. Since the problem is two dimensional, all cell faces normal
to the Z-directions must be part of a symmetry plane ("symplane"). The
cylinder (diameter: 10 cm) is at the center of a square (1 m). Air is injected
with a velocity of 1 m/s.

We chose to apply the ASI method, the shortest one. The cgrid.cgrd file used is:

*IF TIME GT 0.

*SET DPS 300. * 360. / 60.

CSYS 4

*SET TANG TIME * DPS

*GET TPOS Y 1651

*SET TOFF TANG - TPOS

CSET NEWS GRAN 0.049 0.251,,,,,4

VSET NEWS CSET

VGEN 2 0 VSET,,,0 TOFF

CSET ALL

*ENDIF

We only give
the results. They could be checked by calculating the lift (Magnus effect)
created by the cylinder in rotation. The mesh need to be improve to do
further studies.