Blar i NTNU Open på forfatter "Lu, Wenjun"
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A large scale simulation of floe-ice fractures and validation against full-scale scenario
Lu, Wenjun; Heyn, Hans-Martin; Lubbad, Raed; Løset, Sveinung (Journal article; Peer reviewed, 2018)While interacting with a sloping structure, an ice floe may fracture in different patterns. For example, it can be local bending failure or global splitting failure depending on the contact properties, geometry and confinement ... -
A method for real-time estimation of full-scale global ice loads on floating structures
Kjerstad, Øivind Kåre; Lu, Wenjun; Skjetne, Roger; Løset, Sveinung (Journal article; Peer reviewed, 2018)This paper proposes an algorithm that uses conventional measurements found on-board ships coupled with additional Inertial Measurement Units to estimate the motions and global loads acting on them. The work is motivated ... -
An overview of the Oden Arctic Technology Research Cruise 2015 (OATRC2015) and numerical simulations performed with SAMS driven by data collected during the cruise
Lubbad, Raed; Løset, Sveinung; Lu, Wenjun; Tsarau, Andrei; van den Berg, Marnix (Journal article; Peer reviewed, 2018)In the autumn of 2015, the Norwegian University of Science and Technology (NTNU) and the Swedish Polar Research Secretariat (SPRS) performed a research cruise named the “Oden Arctic Technology Research Cruise 2015” ... -
Broken Ice Loads on Floating Wind Turbine
Afanasjev, Mihhail (Master thesis, 2022)I interessen for å designe flytende vindturbiner for kalde områder med flytende havis, utvides det tilgjengelige tekniske verktøysettet i denne oppgaven. SIMA, en programvare for marine operasjoner og fortøyningsanalyse, ... -
Chemical heterogeneity enhances hydrogen resistance in high-strength steels
Sun, Binhan; Lu, Wenjun; Gault, Baptiste; Ding, Ran; Makineni, Surendra Kumar; Wan, Di; Wu, Chun-Hung; Chen, Hao; Ponge, Dirk; Raabe, Dierk (Journal article; Peer reviewed, 2021)The antagonism between strength and resistance to hydrogen embrittlement in metallic materials is an intrinsic obstacle to the design of lightweight yet reliable structural components operated in hydrogen-containing ... -
Dynamic bending of an ice wedge resting on a winkler-type elastic foundation
Kim, Jeonghwan; Lu, Wenjun; Lubbad, Raed; Løset, Sveinung; Jang, Beom-Seon (Journal article; Peer reviewed, 2022)For most ice – sloping structure interactions, the incoming ice floes' failures are determined by the formation of circumferential cracks. This physical process can be simplified as analyzing the bending failure of an ice ... -
Floe Ice – Sloping Structure Interactions
Lu, Wenjun (Doctoral thesis at NTNU;2014:324, Doctoral thesis, 2014)Several interaction processes can be identified during floe ice - sloping structure interactions. However, fierce processes around the waterline are the most conspicuous phenomena. These violent processes feature ice ... -
Glacial Ice and Offshore Structure Impacts under Wave and Current Excitation
Lu, Wenjun; Amdahl, Jørgen (Journal article; Peer reviewed, 2019)Bergy bits and growlers (i.e., glacial ice features with a waterline diameter < 15 m) travelling with waves can pose great threats to offshore structure and ships operating in the high North. It is generally more difficult ... -
Glacial ice impacts: Part I: Wave-driven motion and small glacial ice feature impacts
Lu, Wenjun; Amdahl, Jørgen; Lubbad, Raed; Yu, Zhaolong; Løset, Sveinung (Peer reviewed; Journal article, 2021)Glacial ice features in the northern and central Barents Sea may threaten ships and offshore structures. Particularly, small glacial ice features, which are difficult to detect and manage by concurrent technologies, are ... -
Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS)
Yu, Zhaolong; Lu, Wenjun; van den Berg, Marnix; Amdahl, Jørgen; Løset, Sveinung (Peer reviewed; Journal article, 2021)Floating glacial ice features of various sizes pose a substantial threat to the structural integrity of offshore structures in ice-prone regions. Relatively small ice feathers, e.g., bergy bits and growlers, are a major ... -
Ice and conical structure interactions
Lu, Wenjun (Master thesis, 2010)The pursuit of energy in Arctic waters drives people to design ocean structures applying new concepts.Conical structures which shift the ice failure mode from crushing to bending could reduce the total iceload. Moreover, ... -
Medium-scale consolidation of artificial ice ridge – Part II: Fracture properties investigation by a splitting test
Lu, Wenjun; Shestov, Aleksey; Løset, Sveinung; Salganik, Evgenii; Høyland, Knut Vilhelm (Journal article; Peer reviewed, 2019)Sea ice’s fracture properties are in general difficult to measure and there is still on-going debate on the proper way to conduct valid measurements. Among many controversy fracture test conditions, the size of the test ... -
Parallel channels' fracturing mechanism during ice management operations. Part I: Theory
Lu, Wenjun; Lubbad, Raed; Shestov, Aleksey; Løset, Sveinung (Journal article; Peer reviewed, 2018)It is frequently observed that long cracks in sea-ice tend to form between parallel channels during ice management operations. The long cracks that develop play an important role in reducing the size of the managed ice ... -
Parallel channels' fracturing mechanism during ice management operations. Part II: Experiment
Lu, Wenjun; Lubbad, Raed; Løset, Sveinung (Journal article; Peer reviewed, 2018)During ice management operations, cutting parallel channels with narrow spacing in the ice using icebreakers can effectively reduce the size of ice floes reaching the protected vessel/structure. A narrow channel spacing ... -
Performance Quantification of Icebreaker Operations in Ice Management by Numerical Simulations
Bjørnø, Jon; Skjetne, Roger; van den Berg, Marnix; Lu, Wenjun; Lubbad, Raed; Løset, Sveinung (Peer reviewed; Journal article, 2021)The paper addresses the problem of quantifying and assessing the effectiveness of icebreaker operations in ice management (IM) using a high-fidelity simulator. The numerical model includes an accurate geometric representation ... -
Quantifying Icebreaker Performance in Ice Management Operations by High-Fidelity Numerical Simulations
Bjørnø, Jon; van den Berg, Marnix; Lu, Wenjun; Skjetne, Roger; Lubbad, Raed; Løset, Sveinung (Chapter, 2020)In the study presented in this paper, the problem of quantifying the performance of icebreaker operations within ice management (IM) has been targeted, using the capabilities of high-fidelity simulations by a discrete ... -
Simulator for Arctic Marine Structures (SAMS)
Lubbad, Raed; Løset, Sveinung; Lu, Wenjun; Tsarau, Andrei; van den Berg, Marnix (Chapter; Peer reviewed, 2018)As offshore activities in the Arctic constitute a relatively new field with only a handful of relevant operations to draw experience from, and since full-scale trials are extremely expensive, there is an expressed need for ... -
Splitting as a Load Releasing Mechanism for a Floater in Ice
Lindseth, Sverre Haug (Master thesis, 2013)This master thesis divided into three parts: 1) A literature review on available literature concerning ice, fracture mechanics and theories for splitting of ice floes; 2) The development of a robust criterion for determination ... -
Toward a holistic load model for structures in broken ice
Kim, Ekaterina; Lu, Wenjun; Lubbad, Raed; Løset, Sveinung; Amdahl, Jørgen (Journal article; Peer reviewed, 2015)Over the past decade we have seen an increase in marine operations in Arctic waters. Despite research and work on several offshore standards and ship rules, the ice loads on fixed and floating structures are not fully ... -
Towards Circumpolar Mapping of Arctic Settlements and Infrastructure Based on Sentinel-1 and Sentinel-2
Bartsch, Annett; Pointner, Georg; Ingeman-Nielsen, Thomas; Lu, Wenjun (Peer reviewed; Journal article, 2020)Infrastructure expands rapidly in the Arctic due to industrial development. At the same time, climate change impacts are pronounced in the Arctic. Ground temperatures are, for example, increasing as well as coastal erosion. ...