calcKristCaa.Rd
Calculate air resistance (Caa
) (dimensionless) using the
Kristensen method.
calcKristCaa( shipType, dwt, tankerBulkCarrierGCargoShipTypes = c("tanker", "general.cargo", "chemical.tanker", "liquified.gas.tanker", "oil.tanker", "other.tanker", "bulk.carrier"), containerShipTypes = c("container.ship") )
shipType | Ship type (vector of strings, see |
---|---|
dwt | Ship maximum deadweight tonnage (vector of numericals, tonnage) |
tankerBulkCarrierGCargoShipTypes | Ship types specified in input
|
containerShipTypes | Ship types specified in input |
Caa
(vector of numericals, dimensionless)
Models the effect of realistic hull roughness on resistance, which is not captured in the frictional and residual resistance coefficients from tank towing operations.
This method this requires ship types to be grouped. Use the
tankerBulkCarrierGCargoShipTypes
, containerShipTypes
grouping
parameters to provide these ship type groupings. Any ship types not included
in these groupings will be considered as miscellaneous vessels.
NOTE: within the container ship section of this calculation, estimations are made of the ships TEU:
Feeder: TEU = ((dwt/15.19)^(1/0.9814))
Panamax: TEU = ((dwt/28.81)^(1/0.902))
PostPanamax: TEU = ((dwt/37)^(1/0.875))
These come from: H.O. Kristensen (2016), "Revision of statistical analysis and determination of regression formulas for main dimensions of container ships based on data from Clarkson". Kristensen's SHIP DESMO model also uses another dwt/teu relation for post-panamax container ships with breadth > 49m. This equation has no inverse to map dwt to TEU and thus all post panamaxs are assumed to have the same dwt/teu relation for all breadths, described above.
Kristensen, H. O. and Lutzen, M. 2013. "Prediction of Resistance and Propulsion Power of Ships."
Kristensen, H. O. 2016. "Revision of statistical analysis and determination of regression formulas for main dimensions of container ships based on data from Clarkson."
Kristensen, H. O. "Ship-Desmo-Tool." https://gitlab.gbar.dtu.dk/oceanwave3d/Ship-Desmo
Other Kristensen Calculations:
calcKristCa()
,
calcKristCr()
,
calcKristPwr()
,
calcKristThrustFactor()
,
calcKristTotalRes()
,
calcKristWakeFrac()
,
calcKristWettedSA()
Other Resistance Calculations:
calcCf()
,
calcHMAppendageRes()
,
calcHMBulbousBowRes()
,
calcHMCa()
,
calcHMImmersedTransomRes()
,
calcHMTotalRes()
,
calcHMWaveMakingRes()
,
calcKristCa()
,
calcKristCr()
,
calcKristTotalRes()
#> [1] 5e-05 9e-05 7e-05calcKristCaa(c("bulk.carrier","container.ship","other.tanker"),c(70000,191144,20000), tankerBulkCarrierGCargoShipTypes=c("bulk.carrier","other.tanker"))#> [1] 5e-05 9e-05 7e-05