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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...
The 2-D development process of water cannon is numerically investigated and visualized by a new type of integrated simulation technique. CFD (Computational Fluid Dynamics) analyze focused on the distribution of pressure, velocity and turbulence kinematic energy. Utilizing the governing equations for high-speed flow based on the LES-VOF model, a parallel computation is performed to clarify the detailed...
The effects of blockage due to a large particle suspended in the flow within a tube and rheological characteristics of the carrier fluid on fluid-particle conjugate heat transfer are investigated through computational fluid dynamics simulations. Case studies involving the aseptic processing of a spherical object immersed in pseudoplastic fluids of different power law indices were investigated numerically...
On the basis of N-S equations for solving three-dimensional Reynolds problem, k-ε turbulence model and standard wall function for near wall region were adopted. The region was meshed and boundary conditions were given. The software of computational fluid dynamics (CFD) was used to simulate centrifugal fan in the system of lignite quality improved. The parameters of static pressure, moving pressure,...
For the purpose of simulation of the deployment and retrieval of deep sea mining system, two methods for assessing the added mass of components of deep sea mining system are mainly proposed in this work. The first method is referred to as the Hess-Smith method which is based on surface panel method and potential theory, the surface of the moving object is discretized to lots of panels to approximate...
Simulation of natural phenomena, such as water and smoke, is a very important topic to increase real time scene realism in video-games. Besides the graphical aspect, in order to achieve realism, it is necessary to correctly simulate and solve its complex governing equations, requiring an intense computational work.Fluid simulation is achieved by solving the Navier-Stokes set of equations, using a...
High frequency electro-hydraulic digital valve (abbr. digital valve) achieves its function by periodical on-offs of the valve ports which formed between the spool shoulders grooves and the sleeve windows, when the spool rotates in the sleeve. Noise and vibration will be induced if cavitation phenomena exist in the valve ports. Severely, the solid materials of valve ports will be subject to cavitation...
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...
Direct liquid immersion cooling of concentrator solar cells is proposed as a solution for receiver thermal management of concentrating photovoltaic (CPV) and hybrid concentrating photovoltaic thermal (CPV-T) systems. A novel receiver incorporating direct liquid-immersed cell cooling has been developed for linear trough CPV and CPV-T systems at ANU. Several potential working fluids have undergone preliminary...
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...
In the present study, a canonical geometry has been created for investigating the flow and heat transfer of a purely oscillatory jet that is not affected by the manner in which it is produced, and hence has allowed us to investigate the flow and heat transfer in a generalized approach. The unsteady Navier- Stokes equations and the convection-diffusion equation were solved using a full unsteady, two-dimensional...
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...
There is a new way, using FLUENT--a computational fluid dynamics software, to analyze the inside flow field of hydraulic retarder instead of using one-dimension flow theory. In the simulation process, the inside flow field is assumed whole fluid-filled. And the moving areas use sliding mesh model while the turbulence model chooses standard two equations model. Finally, there are analysis of the pressure,...
In this paper, computer software is employed to simulate the temperature-field and flow-field of AP1000 PRHR HX, and investigate its heat-transferring and flow characteristic. Through comparative analysis of the distribution of temperature-field and flow-field in different locations at the same time, and the change of temperature-field and flow-field in the same location at different times, heat-transferring...
Chimera grids method has broad applications in complex flow field simulations because of its convenience of the arbitrary boundary interfaces and the easiness of gird generations of subzones. However, the main disadvantage or challenging difficulty lies in the global conservative information exchange between different zones or components. This work aims at assessing of the conservation and effects...
This paper describes the application of the built-in volume-of-fluid (VOF) model in the commercial computational fluid dynamics (CFD) software FLUENTTM and the verification of its accuracy. As the VOF model is based on the field volume fraction calculations and surface reconstruction methods, in which a free surface is not explicitly tracked, the aim was to verify that a reconstructed surface obtained...
In the paper, the FLUENT software is used for numerical simulation and characteristic analysis for gas flow in nozzle, unitary flow theory is also applied to establish the mathematical model for nozzle, especially its backpressure functions and associated boundary conditions are defined, and numerical methods for unsteady flow in the nozzle are obtained. Besides, according to governing equations,...
Real-time generation of water waves and interaction between floating objects and fluid is one of the most difficulty research tasks in realistic simulation. We present a new algorithm combining height field surface and single layer-regional particle model to simulate fluid surface waves and their interactions with floating objects. We first generate basic fluid surface with the height field, then...
Firstly, several existing methods for measuring the wave speed in the fluid in a pipe are summarized. Their basic principles, advantages and limitations are compared. To improve the existing methods' limitations, the authors suggest a far simple method to obtain wave speed in viscoeleastic pipes by using experimental pressure data measured in the object viscoelastic pipes. In the new method, flow...
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