Experimental Modeling of Oil Spill Spreading in Vessel’s Wake Current from «Ship to Ship» Mooring

Cheban E. Yu., Kapustin I. A., Molkov A. A., Igonina M. V.

According to a statistical data the largest number of oil spill occurs in the oil handling operations. It requires special measures for preventing emergency situations from the small amount of oil spill. In this case it’s necessary to create conditions for predicted oil slick spreading in the predefined place with favorable environment for oil spill response operation. The special equipment with required parameters for these places needs to be predefined too. An experimental study of an effect of oil simulator transfer from «ship to ship mooring» is given. Different parameters of «ship to ship mooring» were observed, exactly: distance between vessels, flow velocities, displacements of vessels relative to each other. Magnitudes of lateral velocities component are defined for different combinations of flow velocities, hull forms, distance between vessels and vessels’ displacement are defined. Analysis of the «ship to ship mooring» flow fields is given. An important role of a vessel’s mutual disposition, which changes the oil slick flow direction, is demonstrated. An increase of distance between vessels increases the velocity in wake current. Besides that a superposition velocity fields and oil simulator transfer showed a good agreement. Preliminary results allow suggest that there is the optimal distance between vessels in «ship to ship mooring». It can change oil spill response technologies for rivers raids at vessel’s oil handling operations. The second study of this investigation will be field experiments on real vessels and numerical simulation.

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