User-Defined Wake Model |
 
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User-Defined Wake Model |
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This wake model allows you to specify drag and optionally, lift coefficients as functions of the longitudinal and transverse centre to centre separations between the upstream and downstream structures. The drag and lift coefficients used in the calculation of the drag and lift forces are determined from the specified data using bilinear interpolation. Any coefficient requested outside the specified range is taken as zero. The drag and lift forces on the downstream structure are calculated as follows:
(1)
(2)
•*WAKE UPSTREAM is used to specify the composition of the upstream structure in terms of element sets, for use in wake interference calculations. The keyword also selects the wake interference model to be used, and defines associated data to characterise the wake field. Specifically, the TYPE=USER inputs are used to specify user defined Drag & Lift coefficients for the upstream structure.