GPU-Event-Mechanics Evaluation of Ice Impact Load Statistics

Daley, Claude; Alawneh, Shadi; Peters, Dennis; Colbourne, Bruce

doi:10.4043/24645-ms

Cited by 14 publications

(21 citation statements)

References 6 publications

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“…It would be very interesting to still apply stresses at the boundaries but to model the interactions between the sea ice and the idealized ship with a model based on discrete floes (e.g. Daley et al, 2014;Metrikin and Løset, 2013).…”

Section: Discussionmentioning

confidence: 99%

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Toward a method for downscaling sea ice pressure for navigation purposes

2020

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Abstract. Sea ice pressure poses great risk for navigation; it can lead to ship besetting and damages. Contemporary large-scale sea ice forecasting systems can predict the evolution of sea ice pressure. There is, however, a mismatch between the spatial resolution of these systems (a few kilometres) and the typical dimensions of ships (a few tens of metres) navigating in ice-covered regions. In this paper, the downscaling of sea ice pressure from the kilometre-scale to scales relevant for ships is investigated by conducting high-resolution idealized numerical experiments with a viscous-plastic sea ice model. Results show that sub-grid-scale pressure values can be significantly larger than the large-scale pressure (up to ∼ 4 times larger in our numerical experiments). High pressure at the sub-grid scale is associated with the presence of defects (e.g. a lead). Numerical experiments show significant stress concentration on both sides of a ship beset in sea ice, especially at the back. The magnitude of the stress concentration increases with the length of the lead (or channel) behind the ship and decreases as sea ice consolidates by either thermodynamical growth or mechanical closing. These results also highlight the difficulty of forecasting, for navigation applications, the small-scale distribution of pressure, and especially the largest values as the important parameters (i.e. the length of the lead behind the ship and the thickness of the refrozen ice) are not well constrained.

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Section: Discussionmentioning

confidence: 99%

“…There are also some numerical studies of ice loads on ships transiting in ice-infested waters where sea ice is represented using discrete elements (i.e. the floes; Metrikin and Løset, 2013;Daley et al, 2014) or as a continuum (e.g. Kubat et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Toward a method for downscaling sea ice pressure for navigation purposes

2020

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“…최근에는 빙하중 추정 경험 식을 기반으로 유빙 입사각에 따라 극지해양구조물에 작용하는 빙하중을 추정하는 기법 개발이 수행되었다 (Kim and Lee, 2018 (Løset, 1994;Kjerstad and Skjetne, 2014;Kjerstad et al, 2015). 이러한 빙하중 추정 수치해 석법의 한계를 극복하고자 유빙-유빙 및 유빙-구조물 간의 약한 연성 관계를 고려하고, 병렬구조를 가지면서 뛰어난 부동소수 점 연산 성능을 갖는 Graphics processing unit(GPU)를 수치 계산 에 직접 활용하는 GPU-event-mechanics(GEM)이 개발된바 있다 (Daley et al, 2012;Daley et al, 2014a (Daley, et al, 2014b…”

Section: Ice Load Generation In Time Domain Based On Ice Load Spectruunclassified

Ice Load Generation in Time Domain Based on Ice Load Spectrum for Arctic Offshore Structures

Kim¹,

Kim²,

Kang³

et al. 2018

J. Ocean Eng. Technol.

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This paper introduces a new method of ice load generation in the time domain for the station-keeping performance evaluation of Arctic offshore structures. This method is based on the ice load spectrum and mean ice load. Recently, there has been increasing interest in Arctic offshore technology for the exploration and exploitation of the Arctic region because of the better accessibility to the Arctic ocean provided by the global warming effect. It is essential to consider the ice load during the development of an Arctic offshore structure. In particular, when designing a station-keeping system for an Arctic offshore structure, a consideration of the ice load acting on the vessel in the time domain is essential to ensure its safety and security. Several methods have been developed to consider the ice load in the time domain. However, most of the developed methods are computationally heavy because they consider every ice floe in the sea ice field to calculate the ice load acting on the vessel. In this study, a new approach to generate the ice load in the time domain with computational efficiency was suggested, and its feasibility was examined. The ice load spectrum and mean ice load were acquired from a numerical analysis with GPU-event mechanics (GEM) software, and the ice load with the varying heading of a vessel was reconstructed to show the feasibility of the proposed method.

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“…Figure 6.31: Probability plot for ice floe apex angle data. [10] Another important input parameter is the ice floe mass. …”

Section: Simulation Descriptionmentioning

confidence: 99%

Hyper-Real-Time Ice Simulation and Modeling Using GPGPU

Alawneh

Dragt

Peters

et al. 2015

IEEE Trans. Comput.

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Simulation of the behaviour of a ship operating in pack ice is a computationally intensive process to which General Purpose Computing on Graphical Processing Units (GPGPU) can be applied. GPGPU is the use of a GPU (graphics processing unit) to do general purpose scientific and engineering computing. The model for GPU computing is to use a CPU and GPU together in a heterogeneous co-processing computing platform. The sequential part of the application runs on the CPU and the computationally-intensive part is accelerated by the GPU. From the users perspective, the application just runs faster because it is using the high-performance of the GPU to boost performance. This thesis presents an efficient parallel implementation of such a simulator developed using the NVIDIA Compute Unified Device Architecture (CUDA). This simulator can be used to give users the ability to analyze ice-interactions for design, assessment and training purposes. This thesis also describes the execution of experiments to evaluate the performance of the simulator and to validate the numerical modeling of ship operations in pack ice. It also describes the useful applications that have been done using this simulator in planning ice management activities. i

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GPU-Event-Mechanics Evaluation of Ice Impact Load Statistics

Cited by 14 publications

References 6 publications

Toward a method for downscaling sea ice pressure for navigation purposes

Toward a method for downscaling sea ice pressure for navigation purposes

Ice Load Generation in Time Domain Based on Ice Load Spectrum for Arctic Offshore Structures

Hyper-Real-Time Ice Simulation and Modeling Using GPGPU

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