Abstract

Some features of the movement of table-shaped icebergs during their towing are examined. A table-shaped iceberg, towed in the Barents Sea in 2017, for which surveys of the underwater and surface parts were carried out, was selected for the analysis. As a result of numerical and physical modeling, the hydrodynamic characteristics of the iceberg were obtained for different motion courses - good convergence of the results of these methods was achieved. To determine each component, the numerical simulation, based on the equations of a viscous fluid motion, was carried out. Turbulent fluid flow is described by the Reynolds-averaged Navier-Stokes and continuity equations. The kωSST turbulence model is used to simulate turbulence. Numerical differentiation of the equations was performed in the open source CFD software OpenFOAM. It is shown that iceberg has several positions of stable and unstable equilibrium in terms of the rotation around a vertical axis and the influence of an iceberg orientation on additional resistance during rough seas is considered. Obtained results may be used in the table-shaped icebergs towing planning in different regions of the world, as well as in further study of iceberg behavior under load.

Introduction

Towards the development of the Arctic, there is a difficult ice situation, which requires the development of innovative approaches in its development. Particular attention should be paid to the environmental and industrial safety, since the ingress of hydrocarbons into the marine environment in the Arctic will lead to severe consequences for the ecosystem of the polar seas.

Exploration and extraction of resources in the Arctic at great depths (more than 100 m) is challenging due to the unpredictability of ice conditions and high ice loads (Hamilton, 2011). The main threats to offshore oil and gas facilities during the development of the Arctic shelf are ice formations of various origins: icebergs (continental ice) and hummocky formations (deformed sea ice).

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