CFD analysis of the effect of heterogeneous hull roughness on ship resistance

Ravenna, Roberto and Song, Soonseok and Shi, Weichao and Sant, Tonio and De Marco Muscat-Fenech, Claire and Demirel, Yigit Kemal; Dursun, Ahmet and Ӧlmez, Hasan and Kemal Demirel, Yiğit, eds. (2021) CFD analysis of the effect of heterogeneous hull roughness on ship resistance. In: Proceedings of the 2nd International Congress on Ship and Marine Technology (GMO-SHIPMAR-2021). Yildiz Technical University, TUR, pp. 509-522. ISBN 9786050107135

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Abstract

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.

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