Numerical Investigation On Flow Making System In Deep Sea Basin

With the continuous development of marine resources from offshore to deep sea,many deep-sea working platforms are emerging.In order to improve the level of marine resources development,countries around the world have invested a lot of money in the construction of deep-water test infrastructure of marine engineering.Deepwater platforms work under complicated marine environment and put forward higher requirements of the design and construction technology.Before the construction of the project,model tests are required to test the safety and practicability of the design.Ocean deep water multi-purpose basin is an indispensable technical support platform for the scientific research of marine deep water engineering.In order to upgrade the offshore engineering test technology,Dalian University of Technology(DUT)is planning to build an oceanic deep water multi-purpose basin with functions of flow making,waves making and wind making.The design of the flow making system is difficult and complicated,and the design scheme is still in the demonstration.In order to verify the initial design of the oceanic deep water multi-purpose basin of Dalian University of Technology,in this paper,the 1:10 scaled model of the making flow system is numerically investigated and the CFD numerical simulation method is adopted.The pump is the power device of the flow making system.The accuracy of the numerical simulation results of the flow making system is determined by the simulation of the water pump.In this paper,two kinds of numerical simulation methods for pump are tried.The calculation results show that the simplified water pump simulation method for the pressure inlet and velocity outlet of a given model will bring about the problem of non-conservative amount of water mass in the system,which is not suitable for numerical simulation of flow field with free water surface.In the multi-reference frame(MRF),the model flow is conserved.The simulation result can be used to estimate the power of the pump.In this paper,the working conditions of different floating bottom height of the flow system in multi-reference frame(MRF)are studied.The velocity streamline diagram,vertical velocity distribution,free surface height at different times,the power of the pump and the rectification function of the perforated wall are analyzed.The numerical simulation results provide references for the design,optimization and model test of the flow making system.