Validation of full-scale delivered power CFD simulations

Michal Orych,Sofia Werner,Lars Larsson

doi:10.1016/j.oceaneng.2021.109654

Michal Orych, Sofia Werner + Show 1 more

Open Access

https://doi.org/10.1016/j.oceaneng.2021.109654

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Abstract

Verification and Validation of CFD simulations of delivered power at full-scale are carried out for a single screw cargo vessel. Numerical simulations are performed with a steady-state RANS method coupled with a body force propeller model based on a lifting line theory. There are no significant differences in the uncertainty levels between model and full-scale computations. The finest grid exhibits the numerical uncertainty of 1.40% at full-scale. Computed results are compared with sea trial data for three sister ships. Special attention is paid to the effect of roughness on the hull and propeller. The comparison error for the delivered power is about 1% which is significantly lower than the experimental uncertainty.

Highlights

The ship speed-power performance is usually one of the most important factors for a ship operator
In the verification and the validation described earlier, it is computed with a mesh that is set up based on many validations carried out since the method was developed
The main objective of this paper is to present a validation of CFD simulations of delivered power for a full-scale ship

Summary

Introduction

The ship speed-power performance is usually one of the most important factors for a ship operator. Most data comes from sea trials, which are often carried out only at ballast draught, or from monitoring systems on ships in operation In principle, both can be used for validation purposes. An increased interest is observed in full-scale simulations This is due to advancements in numerical methods, more powerful computers as well as trust that the CFD has gained through for example the series of Workshops on CFD in Ship Hydrodynamics initiated in 1980, Hino et al (2020). The importance of CFD simulations at full-scale was highlighted later in Hochkirch and Mallol (2013) and a practical example illustrated by Kim et al (2014). Lloyd’s Register’s full-scale numerical modelling workshop has recently contributed with an open test case for validations.

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