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Thermo-mechanical simulation of the friction stir butt welding (FSBW) process was performed for AA5083-H18 sheets, utilizing a commercial finite volume method (FVM) code, STAR-CCM+, which is based on the Eulerian formulation. Distributions of temperature and strain rate histories were calculated under the steady state condition and simulated temperature distributions (profiles and peak values) were compared with experiments. It was found that including proper thermal boundary condition for the backing plate (anvil) is critical for accurate simulation results. Based on the simulation, thermal...
International attention has been considerably paid for the technology of CO2 capture and storage (CCS) these days because of global warming. In line with the fact that carbon dioxide capture and storage (CCS) technology has been regarded as one of the most promising option to mitigate the climate change and global warming, we have started a 10-year R&D project on CO2 storage in marine geological structure. We carried out relevant studies, which cover the initial survey of potentially suitable marine geological structure for CO2 storage site, monitoring of the stored CO2 behavior, basic...
There are several important considerations in the design of a suction supply sump. It is imperative that the amount of turbulence and entrained air be kept to a minimum. Free air-core vortex occurring at a water-intake pipe is an important problem encountered in hydraulic engineering. These vortices may reduce pump performances, have large effects on the operating conditions and lead to increase plant operating costs. Experiments, conducted in order to select best positions of the suction pipe of a water-intake sump, show qualitative results concerning flow disturbances in the pump-intake...
Wind energy is more and more used as a renewable energy source character. The present wind turbine is a small one which allows to be used on roofs or in gardens to light small areas like publicity boards, parking, roads or for water pumping, heating... The present turbine has a vertical axis. Each turbine blade combines a rotating movement around its own axis and around the main rotor axis. Due to this combination of movements, flow around this turbine is highly unsteady and needs to be modeled by unsteady calculation. One of the main problems of such geometry is to simulate the two combined...
The drag of an isolated rotating wheel sub-system including its accessories (tire, suspension, A-arms and fender) of a tricycle vehicle was studied numerically using the Star CCM+. The purpose of the present work is to optimize the wheel subsystem through drag analysis. The numerical model is validated by comparison to the wind tunnel experimental drag and pressure coefficient. Two aerodynamic shapes of A-arms are designed to perform drag reduction. Numerical simulations show a sensitive drag decrease up to 19.9% of the original wheel subsystem.
Principles of RANSE-based (Reynolds Averaged Navier-Stokes Equations) numerical modelling of a fl ow around the tanker model hull are introduced with the application of the CD-adapco STAR-CCM+ (Computational Continuum Mechanics) software package in the fi eld of ship hydrodynamics. The numerical model used in simulation is drawn up through base parameters and methods of geometrical and mathematical modelling. Results of two numerical simulations performed at design and ballast loading conditions are presented and a comparison with available experimental data is made. Some aspects of further...
Computational Fluid Dynamics (CFD) is becoming a widely used complement to towing tank tests in order to predict the resistance and the wake field during the design phase of a ship. In addition, a lot of research is done on developing valid and effective models for simulating self propulsion and manoeuvring with an operational propeller and ruder configuration. The purpose of this project is to make reliable CFD calculation of the flow arounf the stern and particularly the inflow of the propeller disc (the wake) for a given ship in model scale. The results will be compared with towing tank...
The objective of the present work is to investigate numerically the 3D flow within diesel injector-like geometry using a cavitation model implemented in a commercial CFD code. A comprehensive study of various numerical parameters is performed which can subsequently be used to simulate cavitation under realistic diesel engine conditions.Numerical predictions were performed on a throttle channel at different operating conditions, with and without cavitation , and compared to available experimental measurements. Overall , it was found that the cavitation model was able to predict the onset of...
A RANS based computational fluid dynamics method incorporating the free-surface Volume of Fluid (VOF) multiphase flow has been employed to compute the resistance forces of two idealized seatrain concepts for fixed flotation as well as for two degrees of freedom (DOF) independent motion of each unit. The motion of each unit is analyzed using Dynamic Fluid Body Interaction (DFBI) morphing mesh technique. Seatrain, a series of hulls connected with rigid (except for pitch and heave) links is a potentially valuable concept for the Army Sealift, the Marine Corps as well as a broad spectrum of...

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