The control volume window allows an easy definition and creation of the control volume in most cases. Select the dimensions of the volume, insert the upstream (fore point) and downstream (aft point) extreme points of the body (body_wet layer) and press OK.
Note that the created volume will be oriented in the main Cartesian axes and therefore the body must be oriented accordingly.
Following are commands available in the Create control volume window:
X factor defines the x-length of the control volume. This dimension is defined by the upstream (fore) and downstream (aft) sides. x-length = (1.0+fore+aft) · length
Y factor defines the y-length of the control volume.
Z factor defines the z-length of the control volume.
Length (body length) is calculated from the point data described below.
Reference fore point : Upstream reference point (extreme in general) of the body_wet layer. If possible, this must be in the symmetry plane y = yo and in the floating line.
Reference aft point : Downstream reference point (extreme in general) of the body_wet layer. If possible, this must be in the symmetry plane y = yo and in the floating line.
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Create control volume window can be accessed through the menu option Data > Problem wizards > Tdyn tools > Control volume... .
Note that in order to operate this tool; the geometry must be split in the standard layers, as explained in the previous step.
Observe that it is also possible to generate the control volume manually, split it in the standard layers, and continue with the next step.
The resulting geometry will be split in the following layers:
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Once the volume has been created, press Next to continue with data definition.