calcCf.Rd
Calculates the frictional resistance coefficient (Cf
)
(dimensionless).
calcCf(shipSpeed, lwl, seawaterTemp = 15, seawaterDensity = 1.025)
shipSpeed | Ship actual speed (vector of numericals, m/s) (see
|
---|---|
lwl | Waterline length (vector of numericals, m) (see
|
seawaterTemp | Sea water temperature. Default = 15 (degrees Celsius). Can supply either a vector of numericals, a single number, or rely on the default |
seawaterDensity | Sea water density. Default = 1.025 (g/cm^3). Can supply either a vector of numericals, a single number, or rely on the default |
Cf
(vector of numericals, dimensionless)
Calculates frictional resistance coefficient using the International Tank Towing Committee (ITTC) 1957 method where: $$Cf = \frac{0.075}{(log(V*Lwl/visc)-2)^2}$$
Kristensen, H. O. and Lutzen, M. 2013. "Prediction of Resistance and Propulsion Power of Ships."
Other Resistance Calculations:
calcHMAppendageRes()
,
calcHMBulbousBowRes()
,
calcHMCa()
,
calcHMImmersedTransomRes()
,
calcHMTotalRes()
,
calcHMWaveMakingRes()
,
calcKristCaa()
,
calcKristCa()
,
calcKristCr()
,
calcKristTotalRes()
#> [1] 0.001910808 0.001739616 0.001649932 0.001590441 0.001546485