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The “Damping data” tab can be found under the “Moored vessels, buoys” node. At this tab files can be imported and options can be chosen which are related to hydrodynamic damping properties. 


The following checkboxes ca n be checked:

  • Scale damping data
  • Wichers damping
  • Use Aranha approximation


Scale damping data

When damping data is available for the imported HYD-file in the "Ship data"-tab, this data can be scaled according to the same scale factor. This is automatically done when a damping file is imported. A damping file is a file with damping coefficients for a specific HYD-file. Using a damping file is not obligatory. The file can be imported, exported or deleted. Importing a file means that a file is zipped into the aNyMoor input file (<name>.any). Exporting means that a file is extracted from the aNyMoor input file and a local copy is made, so that the contents of the file can be viewed. Deleting a file means that a file is removed from the aNyMoor input file.

The file should contain two columns, separated by spaces and/or tabs. The first column contains linear damping coefficients for all 6 degrees of freedom, the second column contains quadratic damping coefficients. The units of the linear damping coefficients are [kN/m/s] and [kNm/rad/s], the units of the quadratic coefficients are [kN/(m/s)2] and [kNm/(rad/s)2].


Wichers damping

The so-called Wichers damping is applied. This is a calculation method for viscous damping, with and without current, for tanker shaped vessels. 


Use Aranha approximation

The Aranha method is applied for the correction of wave drift forces due to current. It has two additional properties to set:

    1. Use Aranha without taking current into account
    2. Use Aranha using the Newman correction on the P-matrix



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