WAMIT Interface |
 
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WAMIT Interface |
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Note that the WAMIT Interface is a legacy feature which has effectively been superseded by the newer Hydrodynamic Data Importer. This allows allows you to automatically import characteristic data relating to a Floating Body from a range of well-known hydrodynamic simulation packages.
Flexcom provides an interface to the hydrodynamic radiation/diffraction analysis program WAMIT. This allows you to specify that certain floating body properties (such as wave frequency force RAOs, added mass terms etc.) are read from the output file of a WAMIT analysis, thereby eliminating the scope for error in manually converting these parameters to the format required for input to Flexcom. To invoke this feature, you simply specify the name of each floating body (which is used to uniquely identify the floating body) and the path and filename of the WAMIT output file corresponding to each floating body. Note that all analysis input data, including floating body properties read and converted from a WAMIT output file, are echoed to the Flexcom output file, allowing you to visually inspect the converted data.
The data that Flexcom retrieves for the case of one floating body only is as follows:
•Hydrostatic stiffnesses
•Added mass coefficients
•Radiation damping coefficients
•Force RAOs
•QTFs
The data that Flexcom retrieves for the case of two floating bodies is as follows:
•Hydrostatic stiffnesses for both bodies
•Added mass coefficients, including co-influence terms
•Radiation damping coefficients, including co-influence terms
•Force RAOs for both bodies
•QTFs for both bodies
WAMIT calculates force RAOs (or “exciting force” in the program terminology) using two different methods termed “Exciting forces from Haskind’s relations” and “Exciting forces from direct integration of dynamic pressures”. You have the choice of nominating which values to use as force RAOs. Choosing Radiation as the RAO Computation option via the *WAMIT keyword corresponds to the first of these methods, choosing Diffraction corresponds to the second.
If the same data is available to Flexcom from two sources, namely your Flexcom input data and a WAMIT output file, then Flexcom gives precedence to the WAMIT data. For example, your Flexcom input data might include hydrostatic stiffness terms, and might also include WAMIT interface data, meaning that Flexcom had two sources of (possibly different) hydrostatic stiffness values. In such an event, Flexcom uses the values retrieved from the WAMIT output file. A warning to this effect will be contained in the Flexcom output data.
•*WAMIT is used to specify that Flexcom is to read floating body data from WAMIT output.