Alexander T. Bekker

Numerical CFD-model of contact interactions between hummock and ice fields for estimation of ice loads on Sakhalin offshore GBS platforms

A two-fluid Eulerian-Eulerian model accounting for the contact interactions between obstruction and hummock, stopped before a structure, and ice floes has been developed. In this work the ice cover is considered to behave as a continuous stream of drifting ice surrounded by the water phase. The technique accounts for the «ice-to-ice» interactions. Consequently, a multiphase computational fluid dynamics (CFD) model is formulated and used for the numerical modeling of the process. The input ice data were obtained from the full-scale observations of the ice conditions in the Piltun-Astokhskoe deposit area during 1989÷2002. Some preliminary results and discussions are presented.Copyright

Probabilistic Modeling of Extreme Value Distributions of Ice Loads on “Molikpaq” Platform for Sakhalin-II Project

Characteristics of the drifting ice cover and the scenarios of the ice loads on offshore structures are the major parameters defining durability and reliability of the ice-resistant platforms on the Sakhalin offshore.The study is devoted to the problems of probabilistic and numerical modeling of the process of interaction between the ice cover and the ice-resistant concrete structures on the Sakhalin offshore zone. Geometry of the “Molikpaq” (PA-A) platform for Sakhalin-II Project is used as an example. The input statistical data were received on the basis of full-scale observations of the ice conditions in the Piltun-Astokhskoe deposit area during 1989–2002.The distribution of probability exceedance of ice loads for various ice scenarios on the “Molikpaq” (PA-A) platform was received. A probabilistic estimation of extreme values of ice loads was carried out, taking into account return period of ice conditions.Copyright