Calculate the open water efficiency (openWaterEff) (dimensionless) using the Kristensen method with Harvald regressions.

calcOpenWaterEff(
  Rtot,
  thrustFactor,
  nProp,
  wakeFraction,
  propDiam,
  shipSpeed,
  seawaterDensity = 1.025
)

Arguments

Rtot

Total ship resistance (vector of numericals, kN) (see calcKristTotalRes or calcHMTotalRes)

thrustFactor

Thrust deduction factor (vector of numericals, dimensionless) (see calcKristThrustFactor or calcHMThrustFactor)

nProp

Number of propellers (vector of numericals, see calcPropNum)

wakeFraction

Wake fraction coefficient (vector of numericals, dimensionless) (see calcKristWakeFrac or calcHMWakeFraction)

propDiam

Propeller diameter (vector of numericals, m) (see calcPropDia)

shipSpeed

Ship actual speed (vector of numericals, m/s) (see calcSpeedUnitConversion)

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

Value

openWaterEff (vector of numericals, dimensionless)

References

Kristensen, H. O. "Ship-Desmo-Tool." https://gitlab.gbar.dtu.dk/oceanwave3d/Ship-Desmo

See also

Examples

calcOpenWaterEff(398.487,0.1894947,1,0.3199536,6.7,0,seawaterDensity=1.025)
#> [1] 0