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This paper presents the development of a numerical wave tank (NWT) using commercial Computational Fluid Dynamics (CFD) software, ANSYS Fluent 16.0. NWTs are widely used to analyse and optimise the performance of various wave energy converters, such as the Oscillating Water Column (OWC). A numerical modelling set-up is outlined which utilises Fluents Open Channel Wave Boundary Condition (OCWBC) along...
The miner Anti-fire colloid preparation machine was designed referred to the principle of mixer designing in the chemical industry. The computational fluid dynamics (CFD) program FLUENT was used to simulate the inner flow of the colloid preparation machine which was filled with special fly ash slurry by the MRF method. Results of simulation showed the space of double-leaf arrangement had a significant...
Flood wave dynamics simulations are determined by a robust and accurate Lagrangian block advection (LBA) scheme that can track the dry-and-wet interface and capture the shocks without using any slope limiter to control the numerical oscillations. Two series of challenging numerical problems are considered using the LBA. First, computations are carried out for water waves in a parabolic bowl. The wetting-and-drying...
Ship fins stabilizer is a kind of anti rolling ship technique that could produce lift with initiative swing of fins at zero forward speed, and the lift could counteract the rolling forces of ocean waves. The method that fin stabilizer is used to anti rolling ship is different from the conventional theory of anti rolling ship at zero speed, so it's a kind of new theoretics. In order to study the process...
The technology of leak protection and leak control while drilling through physical methods can be successfully applied based on studying the annulus' behaviour of the whole down hole flow field. In this paper, the model of sealing down hole while drilling through physical methods which will be used for CFD simulation is eatablished through reasonable simplification. Then running numerical simulation...
We report the utilization of radial basis function neural networks (RBFNN) with multi-quadric (MQ) and inverse multi-quadric (IMQ) basis functions for numerical simulation of velocity-field reconstruction in fluid-structure interaction (FSI) problem with the presence of a very step velocity jump at the fluid-solid interface. The NN models were developed and utilized as approaches of investigation...
The intensity of the secondary flow induced, especially, by streamwise vorticity, which are generated in their turn by vortex generators or in flows with curved streamlines [Ajakh et al,] has a direct impact on the heat transfer process. Thus the understanding and quantification of the physical mechanisms underlying the heat transfer by streamwise vorticity are fundamental for practical applications...
Different methods for thermal analysis of a high-speed permanent-magnet machine are presented. The first implemented method is a numerical method which couples computational fluid dynamics and heat-transfer equations. This method gives simultaneous solutions for the thermal and turbulent properties of the cooling fluid in a 2D axi-symmetric geometry and a 3D solution of the temperature distribution...
The stimulation of neointimal hyperplasia by the low and oscillatory arterial wall shear stress (WSS) plays a central role in restenosis. Hemodynamic characteristics of blood flow through stenosis artery and stented artery are numerically investigated in this work. 3D CFD simulations were used to quantify the instantaneous WSS before and after the implantation of an independent designed stent. The...
The ventilation system is the basis to control the hazards in coal mine laneway. High reliability ventilation system can continuously convey fresh air into laneway , dilute the noxious gas, reduce disaster and ensure the mining productivity safe and effective. As we know that, many noxious gases in the coal mine laneway are compossible and their flowing states are complicated. In order to acquire...
Three-dimensional numerical simulation and analysis of the complicated unsteady compressible turbulence flow field in a large-scale gas control valve are performed, using computational fluid dynamics method. Flow visualization of three-dimensional flow field at different valve opening is presented. The velocity distribution and pressure loss of gas flow are studied. The flow behavior of eddy current...
Based on computational fluid dynamic (CFD) method, flow field analysis and structural optimization of a three-phase hydrocyclone were carried out by using FLUENT soft pack. By numerical simulation analysis on de-gas and de-sand functions of the three-phase hydrocyclone, effect of different geometric parameters on de-gas and de-sand functions is studied. It is found that the change of overflow tube...
Three dimensional fluid flow between coalescence separator plates with different shapes have been numerically simulated by the standard K-ε turbulence model in Fluent CFD. The separation characteristics of different separators have been compared. The simulated results show that the corrugated plates and the trapezoidal plates both have relatively high separation efficiency and good effects on flow...
Miniaturization is the trend in analytical chemistry and life sciences. In the past two decades, miniaturization of fluid handling and fluid analysis has been emerging in the interdisciplinary research field of microfluidics. Some of the microfluidic applications are drug delivery, lab-on-a-chip, pharmaceutical development, synthesis of amino acids etc. Most of these applications are used for biochemistry...
The thermodynamics of the exhaust gas recirculation (EGR) cooler is very important for reducing oxides of nitrogen (NOx) emission of diesel engines. Using the CFDesign software, some 3-D fluid thermodynamic models of EGR coolers are established by using the finite element method (FEM); and the temperature, velocity and pressure fields of fluids in the EGR coolers are simulated and verified by experiments...
Centrifugal pump is one of the most important energy conversion device widely used in almost all industrial fields. Improving operating performance of pump is of great significance for energy saving and safety in production. The asymmetrical distribution of flow field and radial force that will cause flow-induced vibrations which reduce operating stability and reliability of centrifugal pump were...
A modified physics-based method is adopted to control the water waves, and the discretization of the governing 2D N-S equation is taken as the interaction between the variables in spaces, based on the idea of spreading though the neighboring regions. Meshing model of the water surface is based on a terrain LOD scheme called Tiled Quad-tree. With that the region of water surface can be extended unboundedly...
Immersion lithography has been accepted as a method for improving optical lithography resolution to 45 nm, and allows improved resolution without a large shift in infrastructure. The premise behind the concept is to increase the refraction index in the space between the lens and resist-coated wafer by insertion of a high refractive index liquid in place of the low refractive index air that currently...
Smooth Particle Hydrodynamics (SPH) is an accurate method in fluid numerical simulation. In this paper we introduce a calculating algorithm based on the SPH, and propose an interactive method to simulate fluids with free surfaces. This method is completely consistent with the dynamic behavior of a viscous fluid, namely described by Navier-Stokes equations. In addition, for online simulation, we adopt...
The present investigation deals with the numerical prediction of the overall performance of evacuated-tube solar collectors using computational fluid dynamics. A standard water-in-glass element, with its tank portion, is investigated and various design variations are checked. The results show that the standard evacuated-tube design can be greatly improved if minor changes are implemented. Among those...
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