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Kaj Riska
Delft University of Technology
Sea iceFull scaleGeotechnical engineeringMarine engineeringHull
35Publications
10H-index
297Citations
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Publications 36
Newest
#1Robert Bridges (Total S.A.)H-Index: 1
#2Kaj Riska (TU Delft: Delft University of Technology)H-Index: 10
Last. Ying Wei (Aalto University)
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Abstract Ice encroachment is the accumulation of ice atop a platform and results when ice drifts against a platform. Most often this occurs in shallow water but in principle can occur in deep water if the ice drift length is long enough. As the ice drifts against the platform it is broken and generates rubble and ice piles in front of the platform, and with sufficient drift duration blocks of ice can be pushed up and onto the platform. This must be taken into account when designing structures in...
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#1Kaj Riska (Total S.A.)H-Index: 10
#2R. Bridges (Total S.A.)
Last. R. Caloba Duarte de Oliveira (Total S.A.)
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Brash ice growth in frequently navigated areas like fairways or ports is quick due to the ‘freezing – breaking’ cycle induced by sub-zero temperatures and ship traffic. This problem is very acute i ...
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#1Robert Bridges (Total S.A.)H-Index: 1
#2Kaj Riska (Total S.A.)H-Index: 10
Last. Jean-Michel Aubert (Total S.A.)H-Index: 1
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Abstract Low temperatures can have a significant impact on the design and construction of marine and offshore structures as the performance and functions can be severely reduced. Compliance with relevant rules and regulations forms a prerequisite along with the specific design considerations to be taken into account. This paper provides an overview of the influence that the specification of the air temperature has on the materials selection used in design codes and standards. The paper focuses o...
1 CitationsSource
#1Kaj Riska (Total S.A.)H-Index: 10
#2Robert Bridges (Total S.A.)H-Index: 1
Abstract Sea ice poses hazards to ships and offshore structures which create challenges for designers. Designers have to take into account the ice actions resulting from the various ice conditions, interactions and operational scenarios which may occur during the lifetime of structures. In this paper the methodologies used in ship and offshore structure standards, such as the Finnish Swedish Ice Class Rules, International Association of Classification Societies Polar Class rules and ISO 19906, a...
1 CitationsSource
#1Sören Ehlers (NTNU: Norwegian University of Science and Technology)H-Index: 14
#2Fai Cheng (Lloyd's Register)H-Index: 1
Last. Janne Valkonen (DNV GL)H-Index: 3
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Structures used in Arctic regions must comply with ice-induced loading without failure, asset loss, or loss of life. Current structural design regulations, particularly for ships, rely primarily on the experience gained from first-year ice, e.g. in the Baltic Sea. Therefore, this paper presents first, the most relevant design rules for both ships and offshore structures, and second, first principle-based pressure and occurrence determination methods to obtain corresponding scantlings. To demonst...
1 CitationsSource
#1Li Zhou (Jiangsu University)H-Index: 5
#2Kaj Riska (Total S.A.)H-Index: 10
Last. Chunyan Ji (Jiangsu University)H-Index: 2
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Abstract The present numerical model simulates ice actions on marine structures in the vicinity of the waterline caused by breaking of intact ice. Intact ice mainly fail in bending or/and crushing mode on the interaction surface between ice and the hull. In this paper, a new method has been proposed to simulate non-simultaneous crushing failure in time domain based on previous research on simulations of bending failure. The simulated results are also compared with model test results. It shows th...
5 CitationsSource
#1Robert Bridges (Total S.A.)H-Index: 1
#2Kaj Riska (Total S.A.)H-Index: 10
#1Xiang Tan (NTNU: Norwegian University of Science and Technology)H-Index: 3
#2Kaj Riska (Total S.A.)H-Index: 10
Last. Torgeir Moan (NTNU: Norwegian University of Science and Technology)H-Index: 39
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Abstract This paper focuses on the influences of the dynamic effects of ship–ice–water interaction on ship performance, ship motions, and ice resistance. The effects of the dynamic bending of ice wedges and ship speeds are especially investigated. The study is carried out using a numerical procedure simulating ship operations in level ice with ship motions in six degrees of freedom (DOFs). A case study is conducted with the Swedish icebreaker Tor Viking II. The 3-D hull geometry of the ship is m...
7 CitationsSource
#1Xiang Tan (NTNU: Norwegian University of Science and Technology)H-Index: 3
#2Kaj Riska (NTNU: Norwegian University of Science and Technology)H-Index: 10
Last. Torgeir Moan (NTNU: Norwegian University of Science and Technology)H-Index: 39
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This thesis is a summary of studies that were carried out as part of candidacy for aPhD degree. The purpose of these studies was to evaluate some factors in shipdesign that are intended for navigating in ice using numerical simulations. A semiempiricalnumerical procedure was developed by combining mathematical modelsthat describe the various elements of the continuous-mode icebreaking process inlevel ice. The numerical procedure was calibrated and validated using full- andmodel-scale measurement...
2 CitationsSource
#1Janne Valkonen (DNV GL)H-Index: 3
#2Kaj Riska (Total S.A.)H-Index: 10
Arctic sea transportation has drawn a lot of attention in the recent years. The possibility of using a shorter route between Europe and Asia interests many actors in the shipping industry. Benefits from the shorter route may, at first, seem attractive. However, there might be factors affecting the feasibility of the route that are not obvious at first. The estimated transit speed along the Arctic route is not necessarily reached due to ice and other prevailing conditions. Simplified methods can ...
6 CitationsSource
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