Visualization
The surface of the cylinder corresponds to the
grid surface where j = 1 (in 1 based, FORTRAN style,
indices, assuming ijk are the dimensions).
To see the dominant features of the flow, run a vortex
finder or release particles every timestep along and
close to the sides of the cylinder. in particular,
look for vortex tearing events.
Flow passed a circular cylinder
will shed vortices at a characteristic frequency. Since this cylinder
is tapered, each section of the cylinder will shed at a
slightly different frequency. The vortices stay together coming off the
cylinder at an angle for as long as they can. Eventually, however, the difference in frequencies along
the cylinder requires that the vortex tear.
Data Format
The data are in plot3d, single-zone, binary format.
All floating point data are in 32-bit IEEE format, SGI endian.
There is one grid file and approximately 400 solution files, one every 10 solution time steps. As the solution time step was 0.1 nondimensional units, the time between
solution files available here is 1.
The time between each
solution file is 1.0 nondimensional time units. The Reynolds number is 150
as defined by the cylinder radius at midspan. Flow is not periodic.
In PLOT3D use plot3d /3d /whole to read the data.
Data
Grid file (1.6 Mbytes)
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