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We present a new particle-based method for high viscosity fluid simulation. In the method, a new elastic stress term, which is derived from a modified form of the Hooke's law, is included in the traditional Navier-Stokes equation to simulate the movements of the high viscosity fluids. Benefiting from the Lagrangian nature of Smoothed Particle Hydrodynamics method, large flow deformation can be well...
In this paper, the author uses Particulate Trajectory Model (PTM) and Porous Medium Model to construct two-dimension physical model and air-solid two-phase flow model in FLUENT to simulate the flow field of the Ceramic Foam Filter(CFF). Studies show that the relative error of flow field pressure between the simulated and experiment result is less than 5%. The simulated trapping efficiency about the...
The submersible mixer as major sewage treatment equipment is very important to sewage treatment plant. The numerical simulation of the internal 3-D incompressible turbulent flow agitated flow field was carried out. By changing some design parameters of mixer impeller, we can analyze the numerical simulation results, they showed that: the impeller produced vortex jet flow, the constant velocity lines...
The hydrodynamics of a two-dimensional bed reactor were studied computationally. To describe the particulate phase stress in the Eulerian-Eulerian two-fluid model, the kinetic theory of granular flow has been used. Syamal O'Brien drag function was used to calculate momentum exchange coefficients between gas and solid phases. We specified diameter of glass beads which is 300μm and restitution coefficient...
Water simulation and terrain change are both important aspects in computer graphics and useful in producing realistic interactive environment. We present a step to combine the two phenomena together. In our system terrain is carefully organized to make it can be modified easily. The water flow is calculated by the shallow water simulation, which is a 2D simplification of Navier-Stocks equations. When...
Based on turbulent model, this paper has established a 3D flow and sediment mathematical model under orthogonal curvilinear system, numerically simulating the free water surface, the flow velocity structure, the sediment content distribution of a 180°sharp curved open channel, as well as the bed deformation effected by complicated flow field of curved channel. Validation and analysis have been made...
In water supply system, pipe-bridge is prevalent used for distributing water. The presence of air in water supply system causes a lot of harm. The object of this paper is to deal with the simulation of air removal from gas-existed water supply pipe-bridge. A three dimensional model of pipe-bridge using VOF method, which including k~ε turbulence model, for predicting the air pockets forming as well...
Based on the Navier-Stokes equations for viscous, incompressible fluid and VOF method, the numerical experiment platform of oil containment by rigid floating boom in wave is established, utilizing the commercial CFD software FLUENT, and the waves are generated by defining the velocity of water particle on the inlet boundary. The volume of fluid (VOF) model is used to distinguish the three immiscible...
The particle laden flow over backward facing step is a typical flow for fluid machines. In order to simulating the two-phase flow in the flow, an anisotropic PDF model of particle proposed by author was employed. The standard k-e model was solved to gain the gas flow with finite volume method, and the anisotropic PDF model was calculated by a Finite Analytic/Monte Carlo Method. It is shown that the...
This paper presents numerical study of droplet dynamics on solid surface using multiphase model of lattice Boltzmann method. This method is an efficient alternative tool for the numerical simulation of multiphase flow. In this paper, we start by describing a choice of interaction potential that reproduces the attraction force between particles together with the varying contact angles on surface by...
In this paper, a multiscale fluid model based on Navier-Stokes is proposed, and the operator splitting method is employed to split the model into advection term, diffusion term, external force term and projection term. Every step is stable, so the whole process is also stable. And at the same time, ??vorticity confinement?? is used to enhance the real-time simulation. Compared with the traditional...
In this work, we apply iterative learning control to address ramp metering in a macroscopic level freeway environment. By formulating the original ramp metering problem as a output tracking and disturbance rejection problem, iterative learning control can be applied and improve the traffic response. The learning mechanism is based on traffic flow. To mimic a real traffic environment, a simulator is...
A novel annular spouted bed with multiple gas nozzles, has been proposed for dryness, pyrolysis, and gasification of coal particulates. It consists of two homocentric upright cylinders with some annularly located spouting gas nozzles between inner and outer cylinders. A three-dimensional Eulerian multiphase model, with closure law according to the kinetic theory of granular flow, was used to simulate...
We present a novel method using particle importance to accelerate the traditional smoothed particle hydrodynamics based fluid simulation. Reynolds number and vorticity are exploited as the new criteria to evaluate the importance for each particle. If a particle is unimportant, its current acceleration and velocity are used to update values in the next time step with the complex state updating step...
In this research, we developed a real-time fluid simulator for a haptic interface to display a virtual environment including 3-dimensional fluid by using smoothed particles hydrodynamics (SPH). SPH is a type of particle method and is suitable for a fast computation; however, it is difficult to incorporate sufficient fluid incompressibility in SPH for simulating a real-time process. This is because...
To elucidate transport properties of gas-liquid two-phase flows with small initial void fractions in pump impeller, based on Reynolds averaged Navier-Stokes equations and standard k-epsiv turbulent model, flow simulation in an axial flow pump impeller was carried out under different operating conditions. Hydrostatic pressure and void fraction distributions were obtained and analyzed respectively....
In order to examine the dynamics characteristic of cavitation bubble in terms of different dynamics parameter of radius and volume respectively. So we consider the dynamics factor of viscosity, the surface tension, the vapour pressure and the adiabatic compress. To use the Gear Stiff algorithm to simulate the famous traditional Rayleigh-Plesset equation in terms of radius frame and use the Runge-Kutta...
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