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The Optimization Design of the Planing Vessel’s Channel Parameters Based on the CFD Technology Hai-long SHEN1, a, Wei Lu2, b and Yu-min SU3, c 1,2,3 National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle, Harbin Engineering University, Harbin 150001, China ashenhailong@hrbeu.edu.cn, bluwei@hrbeu.edu.cn, csuyumin@hrbeu.edu.cn Keywords: catamaran planning vessel;channel parameters;hydrodynamic performance;CFD Abstract:Due to the special hull shape of the catamaran planing vessel, the shiplines optimization design and the hydrodynamic performance prediction of the catamaran planing vessel are mainly carried out by model tank tests and the empirical formula at present.
In this paper, the influence of the key channel design parameters on the catamaran planing vessel hydrodynamic performance is studied based on the CFD technology.
In recent years, with the rapid development of computer calculation ability, some mature CFD methods began to play an important role in the ship hydrodynamic performance prediction, which became a kind of auxiliary means at the hydrodynamic performance test research [1, 2, 3, 4].In this paper, channel parameters’ influence on the resistance performance of the catamaran planing vessel is discussed based on the CFD technology.
Fig. 7 Resistance curves of different Fig. 11 Resistance curves of different channel relative widths channel relative heights Fig. 15 Resistance curves of different channel top deadrise angles Summary Restrictions in simulation and data probing,expenses and scale effects of experimental analysis are good reasons to employ a numerical tool as a part of ship design procedure.In this paper, the single degree of freedom movement method based on the dynamic grid technology is adopted to analyze the influence of channel parameters on the catamaran planing vessel hydrodynamic performance, which includes the channel relative width /B, the channel relative height and the channel top deadrise angle.
The numerical results show that suitable channel parameters could be getting by the numerical simulation within the suggestion scope of channel parameters.

Study of Microminiature Autonomous Underwater Vehicle Hull Form Based on CFD Technique Hailong Shen1, a, Mo Du2, b and Yumin Su3, c 1,2,3 National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle, Harbin Engineering University, Harbin 150001, China ashenhailong@hrbeu.edu.cn, bdumosuper@163.com, csuyumin@hrbeu.edu.cn Key words: CFD; AUV; turbulence model; mesh; resistance coefficient Abstract: Based on CFD technique, this paper discusses the applicability of different turbulence models and mesh partition method which are used to predict the hydrodynamic performance of AUV.
Application CFD to compare submarine hull forms [J].
Proceedings of the 2007 IEEE Intelligent Vehicles Symposium Istanbul, Turkey, June 13-15, 2007:938-943 [6] SHEN Hai-long,SU Yu-min, Mesh partition methods for numerical simulation of the flow fields of full form ships[J].Journal of Harbin Engineering University,Vol.29 No.11,Nov.2008:1190-1198 [7] ZHANG Nan, Nan, SHEN Hong-cui, YAO Hui-zhi.
Validation of numerical simulation on resistance and flow field of submarine and numerical optimization of submarine hull form[J].Journal of Ship Mechanic, Vol.9, No.1, Feb., 2005:1-13 [8] PAN Zi-ying et al.
Research of CFD application in engineering estimation of submarine maneuverability hydrodynamic forces [J].

The purpose is to validate TRIP3.0 for the simulation of transport configurations.
Numeric Simulation of Trapezoidal High Lift Wing The second configuration of AROF-1 is trapezoidal high-lift wing models, which is one of the most common test cases for CFD software.
Numeric Simulation of Trap-Wing with Full-Span Flap.
Numeric Simulation of Trap-Wing with Part-Span Flap.
Validation of TRIP2.0: Numerical Simulation of DPWII Complex Configuration.

Introduction CFD (computational fluid dynamics) is one of the effective numerical simulation methods in hydrodynamic studies.
In recent years, CFD is increasingly used in mechanical design and fluid flow analysis, and become an important design and calculation method.
In this paper, the design method of diagonal flow fans is investigated by CFD, and the characteristics of flow field of the diagonal flow fan is summarized based on the results of numerical simulation, to improve the diagonal flow fan’s flow field and guide the optimal design.
Simulation Setup Outer diameter of the diagonal flow fan is 300mm.
In the a-type fan models, the angle of inlet guide blade are set to 15° and 28°.According to the simulation results, the diffuser and the fan performance curves can be drawn as Fig.6 and Fig.7.

Theflow fields in different monsoon periodsof Shanghai Mengqing Garden were analyzed by computational fluid dynamic (CFD) simulation method.
At the same time, the wind energyvalue in the Shanghai Mengqing Garden wasalso evaluated by CFD method.
All the buildings are kept in the simulation model.
Domain Size.The domain size should be extended on the basis of the building region in the CFD analysis.
Turbulence Model.The turbulence model type is very important for the simulation accuracy of building environmental flow in CFD analysis, because the complex flow phenomena, such as separation, reattachment and vortex shedding, happen in building environmental flow [6].

Simulation domain.
Simulation grids.
Simulation results of series speeds.
Hino: 2005 Proceedings of CFD Workshop, NMRI report (Tokyo, Japan, 2005)
Yu: Research on Calculation and Prediction for Ship Resistance Based on CFD Theory (MS., Shanghai Jiao Tong University, China 2009).

In CFD analysis, the models use various types of Partial Differential Equation (PDE).
Comparison with ANSYS CFD-FLUENT.
The maximum density values almost the same, which are 2.63 kg/m3 for CFD code and 2.29 kg/m3 for ANSYS CFD-FLUENT.
Moin, Direct simulations of turbulent flow using finite-difference schemes, Journal of Computational Physics. 96 (1991) 15-53
Lelef, Boundary conditions for direct simulations of compressible viscous flows, Journal of Computational Physics. 101(1992) 104-129.

Recently, many researchers have been utilized their lab experiments by using computer simulations with different CFD software.
Shirazi et al utilized CFD software to analyze valve performance in presence of cavitation effect[7].
Different CFD software may contain different codes of partial differential equations of fluid flows.
SolidworksFlow Simulations (SWF).
Fang, Numerical simulation and analysis of ball valve three-dimensional flow based on CFD,IOP Conference Series: Earth and Environmental Science, Vol. 052024, 2012

Part of work on CFD simulations by the high-lift system design team in Fudan university for large civil aircraft is presented.
The research on CFD simulation of the high-lift systems and some concepts and experience in three-dimensional geometry modeling are also presented, which are done on the self-developed platform of high-lift device aerodynamic calculation software and programs.
Application of Kriging method In Comparison of CFD and Wind Tunnel Data. 14th national CFD conference.
CFD V&V and Open Benchmark Database[J].
Numerical Simulation Of High Lift System Configuration[J].

CFD Calculation of Wind Turbines Power Variations in Urban Areas Jafar Bazrafshan1,a, Payam Sabaeifard2,b, Farid Khalafi3,c and Majid Jamil3,d 1Department of Mechanical Engineering, Islamic Azad University Ayatollah Amoli Branch, Iran 2 Faculty of Mechanical and Energy Systems, Power and Water University of Technology (Abbaspour University), Tehran, Iran. 3 Department of Energy, Materials and Energy Research Center, Karaj, Tehran, Iran.
In this paper, to examine variations in efficiency of wind turbines in this condition, two models of H-Rotor and horizontal axis wind turbine analyzed based on axial momentum theory through computer simulations.
Simulations conducted through CFD method and k-ε turbulence model was utilized to analyze flow fluctuations in Navier-Stokes equations.
In order to increase precision of simulation, firstly one actuator disk and then two actuator disks developed in axial momentum theory and subsequently following equations used for having final results [9].
Results and Discussion Optimal aerodynamic efficiency of various wind turbines calculated by CFD solver is plotted in fig.8.