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| Page | 23/35 | | Date | 26.04.2018 | | Size | 2.34 Mb. | | #46814 |
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In frequency domain simulation, the drag and damping term in Equation 24 can be linearized to facilitate computation.36,37,38,98 With the presence of waves, currents and riser motions, the linearized drag and damping forces are expressed at the mean equilibrium position by the following formula:
FD=C1(C2C3+2UnC4)(u- )+C1G(s,Un) ...(25)
where
C1 = Cd r D ,
C2 =  s ,
C3 = exp[‑½(Un/s)2] ,
C4 = erf (Un/s) ,
G (s,Un) = [ sUnC3 + C4(s2+Un2)] ,
and erf (x) = (2p)-½  exp (-½g2) dg.
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