Proceedings of the Thirty-second (2022) International Ocean and Polar Engineering Conference
Shanghai, China, June 5–10, 2022
Copyright © 2022 by the International Society of Offshore and Polar Engineers (ISOPE)
ISBN 978-1-880653-81-4; ISSN 1098-6189

www.isope.org

Numerical Investigation of Impacting Loads for a Model Test of High-speed Craft in Waves
Yu-chen Hu1*, Wei-qin Liu1, Jun-wei Cao1, Shuang-xi Xu1,
1. Wuhan University of Technology, School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan, Hubei, China
2. China Ship Research & Design Center, Wuhan, Hubei, China.
*Corresponding Author: Yu-chen Hu

such as stability, mobility, safety and applicability. Under high sea
conditions, the high-speed craft will have a particularly intense
movement when sailing at high speed. With the periodic bow liftingand slamming into the water, the bottom structure of the boat will bedamaged or even broken under the action of enormous wave impact
load in the whole boat range.

ABSTRACT
High-speed crafts are widely used in various occasions because of theirhigh speed and flexibility. The hydrodynamic load of high-speed craftunder high-speed navigation has very complex and strong nonlinear
characteristics, such as green sea and bottom slamming, which makes
the research on the hydrodynamic performance of high-speed craft far
more difficult than that of conventional displacement ships. Therefore,
in this paper, the impact load of high-speed craft under regular wave isnumerically simulated based on STAR-CCM+ software. At the sametime, a tank test of the high-speed craft model is carried out. By
comparing the impact load test results and numerical results of thehigh-speed craft under regular waves, the effectiveness and accuracy ofthe numerical simulation method used in this paper are verified.
Through the analysis of the results, it can be obtained that thenumerical simulation results of the impact load of the high-speed craftmodel are very close to the experimental results, which has a goodreference and guiding significance for the design and construction of
the high-speed craft.

When high-speed crafts sail at high speed under wave conditions, they
will produce general gliding effect, and their impact load and motion
have very complex-strong nonlinear characteristics. For a long time, themodel test method has been the main method to study the load
characteristics of high-speed crafts. (Yang and Kang,2002) studied thetotal wave load acting on an 86m high-speed catamaran ferry andmeasured the actual wave, motion and hull strain. The measured resultsof the real ship were very different from some design loads. (Zhang etal, 2019) made a high-speed M-boat model according to the similarity
theory, studied the variation law of vertical acceleration at the center ofgravity of M-boat under regular and irregular waves and bottom
slamming pressure, and analyzed the influence of speed on bottom
slamming pressure. (Zhu et al, 2013) measured the extreme value andcharacteristics of the slamming pressure on the hull through the model
test of FRP boat in regular and irregular waves, and calculated theslamming pressure at the bottom of the boat by using the estimation
method in engineering application. The results were in good agreementwith the test measurements.

KEY WORDS: High-speed craft; regular wave; CFD; impacti load;
model test.

INTRODUCTIONIn this paper, a CFD numerical simulation method is used to simulate
the load characteristics of high-speed craft to verify the effectiveness ofthe model test results. Since the late 1970s, scholars at home andabroad have noticed that the nonlinear load effects such as ship
slamming and green water under ship motion can’t be ignored.
Considering the influencing factors of nonlinear fluid force, theresearch on ship wave load is more aligned with engineering practice.
(Jensen and Pedersen,1979) proposed a set of nonlinear second-orderslicing methods, which can be applied to the ship motion state andwave load response under medium sea conditions after
comprehensively considering the ship shape, incident wave force andsecond-order hydrodynamic coefficient effects. (Borresen andtellsgard,1980) gave an early warning method for nonlinear response ofhull vertical load in large amplitude regular wave. (He and Zhou,1997)
studied the influence of water depth on ship motion and wave load;(Jiang et al,2011) studied the wave induced load of super standard bulk

The high-speed craft mostly adopts the planing boat type, which has thecharacteristics of high-speed navigation. It is widely used in militaryand civil fields, such as military reconnaissance, inland river patrol andmaritime passenger transport. As a simple high-performance ship, highspeed craft has attracted more and more attention and application for its
superior performance. The impact load of high-speed craft in waves has
also become a research hotspot. Due to the different navigation
characteristics of high-speed craft from ordinary ships at high speed,
the hull of high-speed craft is required to have lighter weight andhigher load carrying capacity. The impact load calculation of highspeed craft under high sea conditions has very complex nonlinear
characteristics, such as flow separation, splashing, broaching, stall,bottom slamming and other transient nonlinear problems. The
traditional potential flow theory can’t solve these problems, that thedirect impact will destroy the basic characteristics of high-speed craft,

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