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Sub command block – tower_shadow_jet
Block that must be included if the model based on the boundary layer equations for
a jet is chosen. This model is especially suited for downwind simulations.
Obl.
*
Command name
tower_offset
*
nsec
*
radius
Explanation
The tower shadow has its source at the global coordinate z
axis. The offset is the base point for section 1
1. Offset value (default=0.0)
Command that needs to present before the radius
commands.
1. Number of datasets specified be the radius
command.
Command that needs to be listed nsec times.
1. z coordinate [m]
2. Tower radius at z coordinate [m]
3. Cd drag coefficient of tower section (normally 1.0
for circular section, but this depends heavily on the
reynold number)
Sub command block – tower_shadow_potential_2
Block that must be included if the tower shadow method 3 is chosen. This potential
model is principally similar to the potential flow model described previously but
differs in the way that the shadow source is moved and rotated in space as the
tower coordinate system is moving and rotating.
The coordinate the shadow method is linked to is specified by the user, e.g. the
mbdy coordinate from the tower main body. To make sure that the tower source
model is always linked in the same way as the tower (could be tricky since the
tower is fully free to be specified along the x,y or z axis or a combination) the base
coordinate system for the shadow model is identical to the coordinates system
obtained by the local element coordinates, where the z axis is always pointing from
node 1 towards node 2. This is the reason that the tower radius input has to
specified with positive z-values, see below.
Obl.
*
Command name
tower_mbdy_link
*
nsec
*
radius
Risø-R-1597(ver. 3-1)(EN)
Explanation
Name of the main body to which the shadow source is
linked.
1. mbdy name
Command that needs to present before the radius
commands.
1. Number of datasets specified by the radius
command.
Command that needs to be listed nsec times.
1. z coordinate [m] (allways positive!)
2. Tower radius at z coordinate [m]
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