Effect of separation vortices on wave-induced sway force and yaw moment acting on a ship running in stern quartering waves

Htet, Thet Zaw; Umeda, Naoya; Toda, Yasuyuki; Hashimoto, Hirotada; Omura, Tomoyuki; Stern, Frederick

doi:10.1007/s00773-021-00826-w

Cited by 3 publications

(1 citation statement)

References 10 publications

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“…The design choice for the wave-piercing tumblehome hull connects to the stealth performance of the vessel, as this hull shape offers smaller radar cross-section compared to conventional hulls (Htet, et al 2019). The hydrodynamic performance of the tumblehome hull has been researched in literature (parametric roll in head waves by using unsteady Reynolds-averaged Navier-Stokes (URANS) CFD code (Liu, et al 2021), sway and yaw moment in stern quartering waves (Htet, et al 2021), extreme event analysis based on the critical wave groups and fully nonlinear CFD code (Silva & Maki 2021). The large body of literature shows that extensive research effort is required to understand the hydrodynamic performance of such a novel hull shape.…”

Section: Uss Zumwalt (Ddg 1000)mentioning

confidence: 99%

Early-Stage Design of Novel Vessels: How can we Take a Step Forward?

Charisi

Hopman

Kana

2022

Day 4 Wed, June 29, 2022

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The aim of this paper is to discuss the challenges associated with the early-stage design of novel and reliable vessels, and discuss the expected benefit of the application of multi-fidelity models in this specific problem. During early-stage design of novel or complex vessels, the naval architect aims to explore the multi-dimensional design space to identify the most promising solutions and identify key trade-offs. The goal is to understand the relationship between the design drivers and the key performance indicators (KPIs) which will lead to the formulation of the main design decisions. This analysis is typically performed with the help of bespoke early-stage design tools. Traditionally, early-stage design tools are computationally cheap, but lack in accuracy. These tools have been developed based on gained design knowledge such as empirical and semi-empirical methods, historical data, and experts’ opinions. However, for the design of novel vessels, these tools are not sufficient because they have typically been developed based on the experience gained from traditional vessels. The early-stage design of novel vessels is challenging because there is very limited existing knowledge about both the design drivers and the KPIs due to their inherent nature of being “novel”. The first part of the paper discusses the challenges associated with the design of novel vessels. Two novel hull designs were examined as qualitative case studies, namely the USS Zumwalt (DDG1000) and Littoral Combat Ship (LCS) – Independent variant, to identify the design drivers and KPIs connected with the design of novel vessels by following a bottom-up approach. Ensuring the vessel’s reliability is a major design aspect for all novel designs. To achieve this, analysis via high fidelity tools is traditionally required. Typically, high fidelity tools are used later on in the design process due to their high computational requirements and the detailed design information required. However, the application of multi-fidelity models (MFMs) in the design process is a promising technique in order to introduce high fidelity models earlier on in the design process. The second part of the paper focuses on an extended literature review on the application of the multi-fidelity models to the design of complex engineering systems. Finally, the most promising methods for this specific problem are identified and discussed.

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