Numerical investigation of ship motions in cross waves using CFD

Jiao, Jing; Huang, Songxing; Soares, C. Guedes

doi:10.1016/j.oceaneng.2021.108711

Cited by 32 publications

(10 citation statements)

References 29 publications

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“…Dynamic Fluid Body Interaction (DFBI) module is adopted to simulate trimaran motions in oblique waves. The release time is set to 0.3 s and the buffer time is set to 0.6 s. It is confirmed that this module can obtain the ship motion responses in waves conveniently and accurately [10,11,16]. However, if six Degrees of Freedom (6-DOF) of the trimaran are released, the ship will not have course stability in oblique waves.…”

Section: Numerical Schemementioning

confidence: 96%

“…An overset mesh scheme, which has been widely used by relevant scholars in simulating complex bodies with large amplitude motions [10][11][12][16][17][18][19][20][21], is applied to simulate the trimaran motions in waves. The computational fluid domain consists of a background region and an overset region, and the overset meshes are used for two regions to exchange data.…”

Section: Fluid Domain and Boundary Conditionsmentioning

confidence: 99%

“…Therefore, it is necessary to study the behavior of the hull slamming that occurs in waves based on ship motion. Jiao and Huang [10,11] simulated ship motions in both uni-and bi-directional regular waves based on the CFD method. Moreover, severe bow slamming and green water under bi-directional waves are also observed and investigated.…”

Section: Introductionmentioning

confidence: 99%

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CFD Prediction of Ship Seakeeping and Slamming Behaviors of a Trimaran in Oblique Regular Waves

Liao

Chen

Gui

et al. 2021

JMSE

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The main hull encounters waves at first and causes waves to break, when trimarans are subject to the slamming in head waves. At this moment, emergence phenomena of side hulls will not occur. Thus, the slamming study of trimarans in oblique waves presents further practical significance. In this study, a CFD method is used for trimaran seakeeping and slamming analysis. An overset grid technique is adopted to simulate ship motions in waves. Firstly, to further verify the present method, a series of verification and validation studies is conducted. Then, the motion responses and slamming pressure with different control parameters, such as forward speed and ship heading angle, are calculated and discussed. The comparative results indicate that the seakeeping and slamming behaviors of trimarans differ significantly from those of conventional monohull ships. Finally, severe bow slamming and green water in oblique waves are also observed and investigated, which should be given enough attention during ship design and evaluation.

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Section: Numerical Schemementioning

confidence: 96%

Section: Fluid Domain and Boundary Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

CFD Prediction of Ship Seakeeping and Slamming Behaviors of a Trimaran in Oblique Regular Waves

Liao

Chen

Gui

et al. 2021

JMSE

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“…The reflections of surface waves are addressed via the forcing solution of the discretized Navier-Stokes equations towards theoretical solution over a specified distance, which increases the calculation efficiency and reduces the calculation time cost owing to its use of reduced-size mesh refinement in the solution domain theoretical solution zone. A detailed explanation and application of the Euler-overlay method (EOM) can be seen in the references [23][24][25][26]. The incident direction of waves and the sailing direction of the USV is shown in Figure 8.…”

Section: Numerical Wave Tankmentioning

confidence: 99%

“…Figure24. Pressure distribution at the bottom of the USV under 7 level sea state with the 0° wave direction (Negative pressure area).…”

mentioning

confidence: 99%

Numerical Simulation of the Motion of a Large Scale Unmanned Surface Vessel in High Sea State Waves

Huang

Liu

Luo

et al. 2021

JMSE

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The motion stability of the Unmanned Surface Vessel (USV) is threatened by the action of waves under a rough sea state. In the present paper, the motion of a large-scale USV is numerically simulated under high sea state of level 5 and 7. The overset grid method and Reynolds Averaged Navier–Stokes (RANS) approach are employed to solve Navier–Stokes (N-S) equations. For the case of wave incident angle 0° and 30°, the heave, pitch and roll motion response of a large scale USV are investigated by using the six Degrees of Freedom (6-DOF) numerical model. The effects of different sea states, as well as different wave directions, on the motion of USV are compared. The comparative results indicate that the response of this USV in waves is the periodic free-motion according to the corresponding amplitude, which does not exceed the stable range, and there are no overturning and other situations that may affect the safety, in the case of level 5 and 7 sea states. The corresponding pressure at the bottom of this USV meets the range of material strength, and no structural damage or injury to the hull occurs, although the pressure varies at different wave periods. For the case of different wave directions, the analysis of the boundary layer thickness shows that the wave direction is of great importance to the boundary layer thickness distribution, both in the level 5 and level 7 sea states.

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Temperature interference in improved FBG pressure sensor for towing tank test

et al. 2023

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Because of EEDI regulations for ships and SDGs, it is of vital importance to develop ships with good propulsion performance, not only in still water, but also in waves. To predict the propulsion and seakeeping performance in waves, and in particular ship motions and added resistance, various theoretical calculation methods and CFD codes have been developed. To validate these estimation methods, experimental data on details of the flow induced by the ship disturbance are required. To meet this demand, the authors developed an innovative method for measuring and analyzing the spatial pressure distribution over the ship-hull surface using a large number of Fiber Bragg Grating (FBG) pressure sensors. However, pressure measurements with the conventional FBG pressure sensors are largely influenced by the difference in the temperature between water and air, referred to as the temperature interference. To resolve this issue, the authors developed a new FBG pressure sensor that incorporates three improvements and is significantly less influenced by temperature interference. Its performance was confirmed through comparisons with measured pressures obtained using existing strain-type and conventional FBG pressure sensors. Furthermore, the effects of different materials used for manufacturing ship models on the pressure measurement were investigated experimentally in towing tank tests. Finally, an experimental study was conducted to determine which of the three improvements in the latest FBG pressure sensor is essential for reducing the temperature interference.

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Numerical investigation of ship motions in cross waves using CFD

Cited by 32 publications

References 29 publications

CFD Prediction of Ship Seakeeping and Slamming Behaviors of a Trimaran in Oblique Regular Waves

CFD Prediction of Ship Seakeeping and Slamming Behaviors of a Trimaran in Oblique Regular Waves

Numerical Simulation of the Motion of a Large Scale Unmanned Surface Vessel in High Sea State Waves

Temperature interference in improved FBG pressure sensor for towing tank test

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