TY - GEN
T1 - CFD analysis of the effect of heterogeneous hull roughness on ship resistance
AU - Ravenna, Roberto
AU - Song, Soonseok
AU - Shi, Weichao
AU - Sant, Tonio
AU - De Marco Muscat-Fenech, Claire
AU - Demirel, Yigit Kemal
PY - 2021/9/16
Y1 - 2021/9/16
N2 - Hull roughness increases ship resistance, power, and fuel consumption significantly. Recent studies have demonstrated that Computational Fluid Dynamics (CFD) can accurately predict the effect of roughness on ship resistance by using a modified wall-function approach. Although hull roughness is often spatially heterogeneous, little research has been carried out on the heterogeneous roughness effect on ship resistance. Therefore, this study aims to investigate the heterogeneous roughness effect on ship resistance using CFD. A series of CFD simulations were conducted on a scaled model of the KRISO Container Ship (KSC) hull. Various surface coverage conditions were considered, including homogeneous (i.e., smooth, and full-rough conditions) and heterogeneous conditions (i.e., different smooth/rough wetted surface ratios). The present findings showed that increased roughness on the fore hull regions has a greater impact on ship resistance than the rough aft-hull regions. The introduction of a so-called roughness impact factor correlated the added resistance of the heterogeneous roughness scenarios to the corresponding rough wetted surface area. Accordingly, the rough fore-hull scenarios presented higher roughness impact factors than the rough aft-hull cases.
AB - Hull roughness increases ship resistance, power, and fuel consumption significantly. Recent studies have demonstrated that Computational Fluid Dynamics (CFD) can accurately predict the effect of roughness on ship resistance by using a modified wall-function approach. Although hull roughness is often spatially heterogeneous, little research has been carried out on the heterogeneous roughness effect on ship resistance. Therefore, this study aims to investigate the heterogeneous roughness effect on ship resistance using CFD. A series of CFD simulations were conducted on a scaled model of the KRISO Container Ship (KSC) hull. Various surface coverage conditions were considered, including homogeneous (i.e., smooth, and full-rough conditions) and heterogeneous conditions (i.e., different smooth/rough wetted surface ratios). The present findings showed that increased roughness on the fore hull regions has a greater impact on ship resistance than the rough aft-hull regions. The introduction of a so-called roughness impact factor correlated the added resistance of the heterogeneous roughness scenarios to the corresponding rough wetted surface area. Accordingly, the rough fore-hull scenarios presented higher roughness impact factors than the rough aft-hull cases.
KW - roughness effect
KW - heterogeneous roughness
KW - ship resistance
KW - computational fluid dynamics (CFD)
KW - KRISO container ship (KCS)
UR - https://www.gmoshipmar.org/
M3 - Conference contribution book
SP - 509
EP - 522
BT - Proceedings of the 2nd International Congress on Ship and Marine Technology (GMO-SHIPMAR-2021)
A2 - Dursun, Ahmet
A2 - Ӧlmez, Hasan
A2 - Kemal Demirel, Yiğit
CY - Istanbul
T2 - 2nd International Conference on Ship and Marine Technology
Y2 - 16 September 2021 through 17 September 2021
ER -