Experiments on level ice loading on an icebreaking tanker with different ice drift angles

Zhou, Li; Riska, Kaj; Polach, Franz von Bock und; Moan, Torgeir; Su, Bitao

doi:10.1016/j.coldregions.2012.08.006

Cited by 43 publications

(18 citation statements)

References 4 publications

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“…With a mesh size similar to the actual ice breaking length in the radial direction can help to approximate the size of crack and obtain a better simulation result. Based on the measurements in the model tests by Zhou et al [29], the full-scaled radial ice breaking length during icebreaking process varies within 1.58m~3.16m, whose mean value is rather close to the horizontal length of medium mesh applied in the present simulations. The simulation results provide another evidence for the conclusion by Lu et al [21].…”

Section: Mesh Dependency Study and Validation Of Numerical Methodssupporting

confidence: 65%

“…The double-hull icebreaking tanker, MT Uikku, is chosen as the object in the present study. Zhou et al [29,30] carried out a series of model tests in the multifunctional ice basin of the Marine Technology Group at Aalto University. The ship model was set to be even keel without heel angle, and the scale factor λ=31.56.…”

Section: Geometry and Numerical Setupmentioning

confidence: 99%

“…where Ri, Rc, Rb, and Rs are the total ice resistance, crushing resistance, bending resistance and submersion resistance, respectively. σb is the ice bending strength, which are 828kPa for 760mm thick ice and 920kPa for 950mm thick ice, based on the measurements in the model tests by Zhou et al [29]. μ is the friction coefficient between the ship and the ice, and ρw is the water density.…”

Section: Effect Of Ship Velocitymentioning

confidence: 99%

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Study of Continuous Icebreaking Process With Cohesive Element Method

Wang¹,

Zhou²,

Zou³

et al. 2019

brod

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Accurate simulation of the continuous icebreaking process in level ice is crucial for the design of icebreakers. The crushing and bending failures of ice sheet, as well as the rotating, sliding and accumulating of ice cusps broken from the ice sheet constitute a complex system for the icebreaking process. In this paper, cohesive element method is combined with an elastoplastic softening constitutive model to simulate continuous icebreaking process in level ice. Firstly, the elastoplastic softening constitutive model in modelling ice local crushing is calibrated by simulating the ice cone crushing tests. Three different softening laws are proposed and their effects on simulation results are evaluated by comparing with the experimental data. Then, the continuous icebreaking process in level ice is simulated by cohesive element method. The regular tri-prism mesh is applied to ice bulk elements to realize the random propagation of crack. The mesh dependency study is carried out, and the simulation results are validated by comparing with model test results in both of time domain and frequency domain. The ice failure patterns during continuous icebreaking process are also compared between the simulated and experimental results. Finally, the influences of ship velocity on ice resistance and ice failure patterns are investigated by numerical methods and semi-empirical formulas.

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Section: Mesh Dependency Study and Validation Of Numerical Methodssupporting

confidence: 65%

Section: Geometry and Numerical Setupmentioning

confidence: 99%

Section: Effect Of Ship Velocitymentioning

confidence: 99%

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Study of Continuous Icebreaking Process With Cohesive Element Method

Wang¹,

Zhou²,

Zou³

et al. 2019

brod

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“…Scaling strength and other engineering properties in experimental facilities, however, requires further steps to ensure that Cauchy similitude is maintained. Ship resistance studies have long experimented with various strategies to weaken model ice to provide more realistic model behaviour, e.g., use of doped ice (i.e., urea as used by Hopkins [89]), or weakening through temperature increase above the freezing point, or spray-freeze cycles [90]. There is indication that errors in load estimations on ship hulls result from small-scale models when comparing to full-scale validation tests [91].…”

Section: Scaling Considerationsmentioning

confidence: 99%

Physical Modelling of Arctic Coastlines—Progress and Limitations

Korte

Gieschen

Stolle

et al. 2020

Water

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Permafrost coastlines represent a large portion of the world’s coastal area and these areas have become increasingly vulnerable in the face of climate change. The predominant mechanism of coastal erosion in these areas has been identified through several observational studies as thermomechanical erosion—a joint removal of sediment through the melting of interstitial ice (thermal energy) and abrasion from incoming waves (mechanical energy). However, further developments are needed looking how common design parameters in coastal engineering (such as wave height, period, sediment size, etc.) contribute to the process. This paper presents the current state of the art with the objective of establishing the necessary research background to develop a process-based approach to predicting permafrost erosion. To that end, an overarching framework is presented that includes all major, erosion-relevant processes, while delineating means to accomplish permafrost modelling in experimental studies. Preliminary modelling of generations zero and one models, within this novel framework, was also performed to allow for early conclusions as to how well permafrost erosion can currently be modelled without more sophisticated setups.

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“…Then the ice loads were measured. Zhou et al (2013b) applied a numerical model to simulate the dynamic ice loads acting on the icebreaking tanker Uikku in level ice, considering the action of ice in the vicinity of the waterline caused by breaking of intact ice and the effect of submersion of broken ice floes. The numerical simulations were also compared with the measured data as given in Zhou et al (2013a).…”

Section: Ice Loads and Vessel Responsesmentioning

confidence: 99%