Rotating cylinder in a parallel flow

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:

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MESH

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.

BOUNDARY CONDITIONS

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.

EVENTS SETTING

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

RESULTS

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.