The increase in ocean waste continues to grow from year to year, especially plastic and solid waste. Various ocean waste collection ships using conveyors exist, both in the form of designs and already in operation, but there has been no research on how many hulls are suitable for ocean waste collectors. This study aims to choose between the three-ship models, namely monohull type U, catamaran type inner flat hull, and trimaran type symmetrical. Assessment is based on ship resistance which relates to fuel consumption and flow distribution relates to ocean waste collection. This research uses Computational Fluid Dynamics (CFD) method which produces resistance, fluid flow velocity contours, and fluid flow patterns. Numerical simulation is based on Reynolds Averaged Navier Stokes (RANS). The turbulent model uses the standard k-epsilon equation. Then the volume of fluid sub-models used is open channel flow. The number of eulerian phases is two. Moreover, formulation of the volume fraction parameters used is an implicit body force. The results show that monohull type U is better than others in easiest to bring ocean waste closer to the conveyor and smallest resistance force. Then symmetric trimaran is faster than others in making ocean waste flow to the conveyor.
This paper presents a series of analyses on the behavior of an underwater remotely operated vehicle (ROV) with the umbilical cable in uniform current. The hydrodynamic mathematical model including the coupled effect of the current and the umbilical cable is proposed here to deal with 6 degrees of freedom motions of the ROV. Because of the umbilical cable on the ROV, the present problem is the two-point boundary value problem with respect to a set of first-order ordinary differential equation systems, which are solved by applying the multistep shooting method. The corresponding hydrodynamic coefficients of the underwater vehicle used in the hydrodynamic model are obtained by the planar motion mechanism (PMM) test technique. Three different current speeds are considered to investigate the current effect on the ROV's operations including forward motion, ascending motion, and descending motion. The present results reveal that the current indeed significantly affects the operations of the ROV, and the mathematical numerical model developed here can serve as a useful tool to offer some valuable information for the anticurrent ROV design.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.