#### Damping data

In this tab damping files can be imported and options can be chosen which are related to hydrodynamic damping properties.

The following checkboxes can be checked:

##### 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:

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