Q2. What is the effect of the added viscous damping on the motion of the FB?
While the added viscous damping 696 removes energy from the motion response and, thus the waves radiated by the body motion, it has 697 no effect on the diffraction problem, i.e. the waves scattered by the fixed body.
Q3. What was the numerical set-up for the viscous damping?
In the numerical set-up it was possible to include a linear external damping coefficient as a 494 supplement to the wave damping.
Q4. What is the way to measure the nonlinearity of the waves in deep water?
In deep water, the appropriate measure of nonlinearity is the wave 265steepness, /S H L , which has a maximum value of max 14.2%S .
Q5. What type of tests are used to determine the damping force?
Decay tests 403Traditionally, the damping force is divided into three types; structural, material and fluid 404 damping, see for instance (Sumer and Fredsøe, 2006).
Q6. What is the damping ratio of the FB?
The damping ratio originating from viscous damping can be difficult to compare directly 514 between cross sections, as the restoring coefficients also changed between the cross sections, as a 515 consequence of the volume of porous media, and due to different non-linear processes.
Q7. How did the reflection coefficient decrease for the largest wave 337frequencies?
335 When adding the porous media to the sides of the FB, the reflection decreased significantly as the 336 porous media reduced the reflection coefficient from around 0.7 to around 0.3 for the largest wave 337frequencies.
Q8. How many frequencies are the waves generated in the mooring system?
It is desirable to keep the nonlinearity of the waves generated in the flume at a uniform level over 264 the entire range of frequencies.
Q9. What frequency was the diffraction coefficient for the cross section with porous sides?
The cross 754 section with porous sides (WP P100) showed significantly smaller reflection and transmission 755 coefficients for wave frequencies larger than 0.8
Q10. What was the damping ratio found from decay tests?
The damping ratio, total ,was found from decay tests, 524WAMIT was the damping ratio estimated from the numerical modelling without introducing external 525damping.
Q11. What is the largest damping ratio for the sway 432?
The case that 434 included porous sides (WP P100) had the largest damping ratio in heave, which might be related to 435 water filling and emptying the porous media.