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The study is concentrated on the analysis of the interaction between oil wells and water-induced hydraulic fractures. The problem is considered in terms of theory of poroelasticity, hydrodynamics and fracture mechanics. The hydrodynamic aspect of the problem is divided into two types: oil displacement by water injected and the study of water behaviour inside the fracture itself. Numerical modelling...
Underwater glider moves vertically by change in buoyancy and moves horizontally due to wings. In this paper, we validate the experimental lift and drag characteristics of a glider from the literature using Computational Fluid Dynamics (CFD) approach. This approach is then used for the assessment of the steady state characteristics of a glider under development. Flow behavior and lift and drag force...
The purpose of this paper is to find the variation of pollutant concentration field and its impact on water intake of the Fen River entrance into Yellow River. A 2-D water hydrodynamic and quality model was used to simulate flow and variation of the pollutant concentration field. There will be a backwater in tributaries when the water in Yellow River flow into Fen River. The COD concentration decreased...
Taking full account of the liquid viscosity, surface tension and other factors, a detailed numerical simulation using VOF method was carried out to study the dynamic behavior of bubbles in still water, and obtained the rising path, deformation process and speed changes. The numerical results were compared with experimental data, and gained good result. It shows the results of this study can provide...
Based on technical requirements of PIV (Particle Image Velocimetry) system, experiment setup of submerged water jet flow was founded and dynamic characteristics of it were studied. The experiments proved the feasibility of advanced PIV technology for dynamic characteristics and velocity structure research. The experiments show that the axial velocity distribution on the jet flow section keeps the...
The three-dimensional turbulent flow in a supercritical pump with complex double-cases based on the integral model combined with the pass-by pipes is computed and simulated by means of a parallel computer and the software FLUENT using the mathematical models (Navier-Stokes equations, RNG k-ε turbulence model and boundary conditions) in Computational Fluid Dynamics (CFD), which aims at improving the...
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...
Haptic interaction with virtual objects is a major concern in the virtual reality field. There are many physically-based efficient models that enable the simulation of a specific type of media, e.g. fluid volumes, deformable and rigid bodies. However, combining these often heterogeneous algorithms in the same virtual world in order to simulate and interact with different types of media can be a complex...
Employing air as fluid media, hydrodynamics performances in cracking furnace tube with twisted slice were studied, then the flow field (velocity, pressure drop, and resistance loss) of heat transfer enhancement was simulated based on CFX, at last, the effect of twist ratio on flow field was analyzed. The experimental results showed that boundary layer in the tube became thin compared with circular...
A fluid dynamic algorithm based on smoothed particle hydrodynamics (SPH) is proposed for coordination of a team of unmanned aerial vehicles (UAVs) in a wireless sensor network. SPH is a Lagrangian particle method typically used to model compressible and quasi-incompressible fluid flows. In this study, SPH is used to develop a decentralized controller for a swarm of fixed-wing UAVs, which move in 3-D...
Dynamic states of cancer cells moving under shear flow in an antibody-functionalized microchannel are investigated experimentally and theoretically. A simplified physical model was adopted to analyze the cell motion; it features a rigid sphere, with receptors on its surface, moving above a solid surface with distributed ligands. The cell motion is described by the Langevin equation where the hydrodynamic...
Two different boundary condition treatments-mirror boundary conditions and static boundary conditions are implemented to simulate lid-driven cavity flow with incompressible SPH (ISPH) algorithms. The algorithms include density-invariant ISPH (ISPH-DI) and divergence-free ISPH (ISPH-DF). The results show that simulations are more accurate with the static particles boundary and the ISPH-DF algorithm...
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...
It is important to gain the ship hydrodynamic coefficients in the process of ship motion modeling and simulation. Currently, hydrodynamic coefficients are available by tank test methods, theoretical calculations and the approximate estimation methods that based on the experimental data in the tank. In this paper, based on the ship test data in the tank, longitudinal and transverse virtual mass and...
The shape with negative pressure gradient (NPG) is the necessary condition that can ensure vehicle moving in water not to separate. Separation and cavitation characters of shape U-1 with NPG were simulated, and the results were compared with the Nesteruk's experimentation data. According to the potential theory, two different aerofoils with NPG were designed. Considering different angle of attack...
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...
Fluid simulations based on Smoothed Particle Hydrodynamics (SPH) have been widely used for generating complex motion of fluid.However,implementation of searching particle neighbors on graphics processing unit (GPU) can not be satisfied till now.In this paper, we present a new grid-based neighbor search method on GPU for GPU-based SPH fluid simulation.Using this new GPU-based neighbor search technique...
The horseshoe vortex is typical flow characteristic around the appendage-body junction. The horseshoe vortex formation around the hull-said junction has important influence on the submarine hydrodynamics performance. The origination process of the submarine horseshoe vertex and its influence on submarine flow is analyzed. The numerical simulation on the horseshoe vortex is carried out using DES method...
An integrated strategy coupling GIS with two-dimension hydrodynamic model is explored to simulate the flooding inundation in the upper reaches of Huangpu River. DEM data, hydraulic engineering map and other available geospatial data are used and aid to generate the computational grid, while, some treatments of interior and exterior boundary conditions, and calculations of variable resistance terms...
The main objective of this paper is to carry out a rigorous hydrodynamic analysis of gulf-stream turbines and determine power for a range of flow and geometric parameters. For the purpose, a computational tool based on the vortex lattice method (VLM) is developed. Velocity of the flow on the turbine blades, in relation to the free-stream velocity, is determined through induction factors. The geometry...
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