Xem 1-20 trên 191 kết quả Hydrodynamics
  • With the amazing advances of scientific research, Hydrodynamics - Theory and Application presents the engineering applications of hydrodynamics from many countries around the world. A wide range of topics are covered in this book, including the theoretical, experimental, and numerical investigations on various subjects related to hydrodynamic problems. The book consists of twelve chapters, each of which is edited separately and deals with a specific topic. The book is intended to be a useful reference to the readers who are working in this field....

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  • Hydrodynamics and morphodynamics of a seasonally forced tidal inlet system are investigated using numerical models. The ocean forcing including tidal and wave actions and sediment transport is simulated using Delft3D model. Fluvial processes in Delft3D are taken into account as results from SOBEKRURAL model.

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  • Introduction to hydrodynamic modelling and granular dynamics The present text introduces hydrodynamic modelling principles in the context of batch wet granulation and coating systems and it reviews the latest achievements and proposals in the scientific literature in this field. The text concerns primarily the Eulerian and the Lagrangian modelling technique. In accordance with some of the latest published Ph.d. thesis in the field of hydrodynamics modelling, the Lagrangian technique is divided into a soft-particle and a hardsphere approach.

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  • Hydrodynamic cavitation is a technology for the conservation of soil and water and waste water treatment due to its simple reactor design and capacity in large‐ scale operation. When fluid’s local pressure reaches a level lower than the saturation vapour’s pressure at environment temperature, cavitation bubbles begin to grow and together with fluid flow are driven to the points with high pressure where they are quickly collapsed.

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  • This paper proposes a hydrodynamic/sediment model for simulating bedload sediment through a river section. Firstly, flow characteristics such as depth-averaged velocity were obtained by solving the governing equation, which is derived from the Reynolds equations and allows for taking into account the gravity, bed shear stress, turbulent diffusion force and secondary flow in calculations.

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  • In this article, we present a numerical Smoothed Particle Hydrodynamic (SPH) method. In the SPH method for the Navier – Stokes equations the most widespread method to solve for pressure and mass conservation is the weakly compressible assumption (WCSPH). This article presents two important benchmark problems to validate the algorithm of SPH method. The two benchmark problems chosen are the Lid – driven cavity problem and Poiseuille flow problem at very low Reynolds numbers. The SPH results are also in good agreement with the analytical solution.

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  • In this work, the commercial Computational Fluid Dynamics (CFD), ANSYS-Fluent V.14.5 has been used to illustrate the effects of rudder and blade pitch on hydrodynamic performances of a propeller. At first, the characteristic curves of a container ship propeller are computed. Then, effects of rudder on hydrodynamic performances of the propeller in the both cases of the propeller with and without rudder have been investigated.

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  • Miscible displacement can be understood as a physical process in a porous medium whereby two or more fluids fully dissolve into each other when a fluid mixes and goes into the pore space occupied by other fluids without the existence of an interface. A physical model was made in Can Tho University, which included an electrical current system connecting nine groups of four-electrode probes for measuring the electrical conductivity of a potassium chloride solution flowing through a horizontal sand column placed in a firm frame.

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  • This paper aims to generalize and introduce a combination method to determine all components of hydrodynamic coefficient of added mass and inertia moment of marine crafts moving in 6 degrees of freedom.

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  • This paper presents a numerical simulation of hydrodynamic journal bearing lubrication by using finite element method to solve Reynolds equation in static load condition. Reynolds boundary condition applied to this research in order to yield oil film pressure distribution at a given oil supply hole position.

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  • Fluid hydrodynamic fixed abrasive grinding (FHFAG) is now evolving into a promising finishing method underpinning the major advances across grinding and lapping sciences. While the advances have been startling, the key unmet challenge to date is the theoretical basis of removal function. Here, we approach this challenge by presenting a fully coupled flow deformation model. Given the separation function on microchannel from the grits fixed on the grinding pad, hydrodynamic pressure distribution with many dynamic pressure peaks and basic film thickness can be described theoretically.

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  • Based on the Cornwall-Jackiw-Tomboulis effective action approach, a theoretical formalism is established to study the hydrodynamic instabilities in two-component condensates of Bose gases. The effective potential is found in the Hartree-Fock approximation and this quantity is then used to derive the expression for the pressure, which depends on particle densities.

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  • This paper provides a method for the calculation and evaluation of the hydrodynamic coefficients of an AUV. The presence methodology is therefore one useful tool for determining an underwater vehicle’s dynamic stability. The calculated values have been compared with experimental results of a torpedo shape. It was concluded that the methods could calculate accurate values of the hydrodynamic coefficients for a specific AUV shape with its elliptical nose.

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  • This study analyses the hydrodynamic characteristic of the tilting pad thrust bearing. Research content is simultaneously solving the Reynolds equation, force equilibrium equation, and momentum equilibrium equations. Reynolds equation is solved by utilizing the finite element method with Galerkin weighted residual, thereby determines the pressure at each discrete node of the film. Force and momentums are integrated from pressure nodes by Gaussian integral.

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  • In order to investigate hydrodynamic phenomena in two-phase flow conditions in nuclear safety analysis, a series of two-phase flow experiments were conducted using a single flow channel in which air and water were simultaneously injected into the test section. The experiments under atmospheric pressure conditions were carried out with the water velocity and the air velocity covering the ranges from 0.2 to 1.5 m/s and 0.05 to 0.2 m/s, respectively.

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  • The final article in this section presents a modification to the Green’s function approach for modeling acoustic pressure, where the use of conformal mapping is replaced by a group of bound vortices. The author shows that the approach is readily extended to three dimensions. The method is discussed in the context of aircraft noise.

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  • Since the dawn of history, human activities have always been closely related to friction, the resistance to sliding. It is thanks to friction that one can stand and walk on the ground, one can wear clothes, one can make fire by rubbing two sticks together, or one can even start and stop a car. In these cases friction is very useful for human beings. In many other cases, however, human activities have been very much hampered by friction since ancient times. How to diminish friction is one of the most basic technological problems. For example, when a heavy...

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  • Hydrodynamics has experienced a long history. A substantial growth of knowledge in this field has been happening since the 18th century. It is applicable in a wide variety of areas, such as ocean engineering, environmental engineering, water conservancy, energy exploration, and chemical engineering, to name a few. Over the past several decades, good progress has been made in physical models, computational methods, and theoretical studies, which significantly expanded the understanding and the engineering implications of hydrodynamics....

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  • The Presence of Hydrodynamics in Modern Sciences: Optimizing Methods and Tools “Water is the beginning of everything” (Tales of Mileto) “Air is the beginning of everything” (Anaxímenes of Mileto) Why is it important to study Hydrodynamics? The answer may be strictly technical, but it may also involve some kind of human feeling about our environment, and our (eventual) limitations to deal with its fluidic constituents.

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  • Tham khảo tài liệu 'hydrodynamics optimizing methods and tools part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf30p 181024119873 08-02-2012 37 7   Download




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