Refer to Section 3.4.3 of Dynamic Response Manual, only Davenport Coherence Function is available. Moreover, the decay factors are fixed at 12 and 8 for Cy and Cz.

The suggestion is

• Allow user to change the Decay factors for Davenport Coherence Function i.e. NOT Cy=12 & Cz=8. DNV-RP-C205 also suggest different number.

• Add more Wind Coherence Functions rather than just Davenport Coherence Function. For example, ESDU 1986, IEC, von Karman, Froya etc.....