This data category is used to input two types of parameter which affect non-diffracting elements with hydrodynamic coefficients. The first is a scale parameter which only affects Morison elements, e.g. TUBE elements, whose drag coefficient is dependent on Reynolds Number. The second is a simple multiplying factor for the drag, added mass and slam coefficients affecting all Morison elements.
As the input in this data category only applies to non-diffracting elements, it follows that only those programs which use these elements will accept this data category. This point is clarified below.
Aqwa-Drift: Accepts all elements and parameters.
Aqwa-Fer: Not yet implemented. Note that Morison drag is a non-linear force which must be linearized before a frequency domain solution can be applied.
Aqwa-Librium: Accepts all elements. Note that only the drag parameters are relevant, as a steady state solution has zero ADDED MASS and slam force.
Aqwa-Line: Not yet implemented. At present will only accept diffracting and point mass elements.
Aqwa-Naut: Accepts all elements and parameters.
Note: The default value for the factor multiplying the slam coefficient is zero, as there are no general formulae documented in the literature (see The SLMM Data Record - Slam Multiplying Factor).
The scale factor is commonly used where the effects of Morison drag on TUBE elements is considered important (e.g. simulating tests at model scale). The multiplying factor is used for parametric studies where the effect of the hydrodynamic coefficients is of particular interest.