Numerical Simulation of Hydraulic Characteristic of Oxidation Ditch

2011 ◽  
Vol 393-395 ◽  
pp. 1300-1303
Author(s):  
W.L. Wei ◽  
B. Lv ◽  
Y.L. Liu
Keyword(s):  
Numerical Simulation ◽  
Pressure Distribution ◽  
Numerical Method ◽  
Turbulence Model ◽  
Simulation Study ◽  
Simple Type ◽  
Oxidation Ditch ◽  
Correction Algorithm ◽  
Numerical Convergence ◽  
Wall Functions

A numerical simulation study of the hydrodynamics of oxidation ditch is presented. The numerical method is based on a pressure-correction algorithm of the SIMPLE-type. A multigrid technique based on the full approximation storage (FAS) scheme is employed to accelerate the numerical convergence, while as a turbulence model the RNG κ-ε model with wall functions is used. The numerical results for velocity, as well as for the pressure distribution in the oxidation ditch are obtained．

3D Numerical Simulation of Hydraulics in an Oxidation Ditch

2012 ◽  
Vol 468-471 ◽  
pp. 190-193
Author(s):  
B. Lv ◽  
W.L. Wei ◽  
Y.L. Liu
Keyword(s):  
Numerical Simulation ◽  
Numerical Method ◽  
Turbulence Model ◽  
Simulation Study ◽  
Simple Type ◽  
Oxidation Ditch ◽  
Correction Algorithm ◽  
3D Numerical Simulation ◽  
Numerical Convergence ◽  
Wall Functions

A numerical simulation study of the hydrodynamics of an oxidation ditch is presented. The numerical method is based on a pressure-correction algorithm of the SIMPLE-type. A multigrid technique based on the full approximation storage (FAS) scheme is employed to accelerate the numerical convergence, while as a turbulence model the RNG κ-ε model with wall functions is used. The numerical results for velocity in the oxidation ditch are obtained．

Numerical Study of the Flow over a Two-Dimensional Car Model

2011 ◽  
Vol 374-377 ◽  
pp. 677-680
Author(s):  
Wen Li Wei ◽  
Pei Zhang ◽  
Ming Qin Liu
Keyword(s):  
Pressure Distribution ◽  
Numerical Method ◽  
Turbulence Model ◽  
Numerical Study ◽  
Two Dimensional ◽  
Correction Algorithm ◽  
Numerical Convergence ◽  
Wall Functions ◽  
Pressure Correction ◽  
Car Model

A numerical study of the flow over a two-dimensional car model in proximity to the ground is presented. The numerical method is based on a pressure-correction algorithm of the SIMPLE-type．A multigrid technique based on the full approximation storage (FAS) scheme is employed to accelerate the numerical convergence, while as a turbulence model the standard κ-ε model with wall functions is used. The numerical results for the u and v velocity ,as well as for the pressure distribution over the car surface are obtained．

Simulation of 3D Gas-Liquid Two-Phase Flow Characteristics of Carrousel Oxidation Ditch

2012 ◽  
Vol 482-484 ◽  
pp. 1265-1268
Author(s):  
Y. L Liu ◽  
B Lv ◽  
W.L Wei
Keyword(s):  
Flow Characteristics ◽  
Simple Type ◽  
Oxidation Ditch ◽  
Correction Algorithm ◽  
Two Phase ◽  
Numerical Convergence ◽  
Wall Functions ◽  
Proposed Model ◽  
Phase Mixture ◽  
Carrousel Oxidation Ditch

In this paper, the gas–liquid two-phase mixture model with the k-ε turbulence model was used to numerically simulate the characteristics of an oxidation ditch. The proposed model concerns with the drag force and the drift velocity. The numerical method is based on a pressure-correction algorithm of the SIMPLE-type. A multigrid technique based on the full approximation storage (FAS) scheme is employed to accelerate the numerical convergence, while the κ-ε model with wall functions is used. The numerical results for velocity and turbulent kinetic energy in the oxidation ditch are obtained．

scholarly journals Comparison of Different Turbulence Models for Numerical Simulation of Pressure Distribution in V-Shaped Stepped Spillway

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Zhaoliang Bai ◽  
Jianmin Zhang
Keyword(s):  
Numerical Simulation ◽  
Pressure Distribution ◽  
Flow Pattern ◽  
Turbulence Model ◽  
Turbulence Models ◽  
Flow Regimes ◽  
Stepped Spillway ◽  
Stepped Spillways

V-shaped stepped spillway is a new shaped stepped spillway, and the pressure distribution is quite different from that of the traditional stepped spillway. In this paper, five turbulence models were used to simulate the pressure distribution in the skimming flow regimes. Through comparing with the physical value, the realizablek-εmodel had better precision in simulating the pressure distribution. Then, the flow pattern of V-shaped and traditional stepped spillways was given to illustrate the unique pressure distribution using realizablek-εturbulence model.

Numerical Simulation of Wind Environment in a Hill and Buildings Configuration

2014 ◽  
Vol 641-642 ◽  
pp. 544-549
Author(s):  
Cheng Jun Shen ◽  
Cui Lan Gao ◽  
Ya Min Song
Keyword(s):  
Numerical Simulation ◽  
Urban Areas ◽  
Street Canyon ◽  
Simple Type ◽  
Correction Algorithm ◽  
Street Canyons ◽  
Wind Environment ◽  
Ambient Wind ◽  
Roof Level ◽  
Volume Method

Numerical simulation of air flow over urban areas is an effective way to analyze and predict the wind environment. This paper presents two dimensional computer model results concerning the effects of buildings and/or a hill on the wind flow. The RANS equations and RNG κ-ε turbulence model used in the simulation are discretized by the finite volume method. The computational solution is based on a pressure correction algorithm of the SIMPLE-type. The inflow boundary conditions are given by wind tunnel experiment. In the presence of only a street canyon formed by two buildings, the ambient wind is accelerated and slightly curved at the roof level. When there exist a hill and a street canyon, the velocity in the canyon is affected by the upwind hill. Another simulation model, which has a hill and two street canyons, is used for comparison. There is a little difference in velocity between a single street canyon and two canyons in the presence of an upwind hill.

Numerical Simulation of Elastic Conforming Contacts Under Eccentric Loading

2008 ◽  
Author(s):  
Sergiu Spiˆnu ◽  
Emanuel Diaconescu
Keyword(s):  
Numerical Simulation ◽  
Pressure Distribution ◽  
Numerical Method ◽  
Contact Area ◽  
Contact Analysis ◽  
Numerical Results ◽  
Elastic Contact ◽  
The Subject

The subject of eccentrically loaded conforming contacts is approached analytically under the restriction that the eccentricity is small enough to keep the contact closed. This paper advances a numerical method for contact analysis valid at any eccentricity value. An additional loop is added to the classic elastic contact solver to account for load eccentricity. The method predicts contact area and pressure distribution even when the contacting bodies lose contact in some peripheral points. Numerical results of pressure distribution for a circular flat end punch agree well with existing analytical predictions.

The Numerical Simulation and Analysis of Wind Pressure Distribution on Sloping Roof of Storey Factory

2013 ◽  
Vol 838-841 ◽  
pp. 593-596
Author(s):  
Ting Wei Zhou ◽  
Cheng Wei Huang ◽  
Jian Zheng
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Pressure Distribution ◽  
Turbulence Model ◽  
Leading Edge ◽  
Main Issue ◽  
Wind Pressure ◽  
Windward Side ◽  
Hexahedral Element ◽  
Simplec Algorithm

As wind-induced damage always occurs at the roof of storey factory, the roof pressure of storey factory under different wind directions was analyzed based on the Realizable k-ε turbulence model. Hexahedral element based numerical modeling was chosen, and the pressure-linked equations were solved with fast-convergence SIMPLEC algorithm. The results showed the wind pressure at the leading edge from the windward side is far greater than other regions of the roof, indicating this area should be the main issue in wind-resistant design.

NUMERICAL SIMULATION STUDY ON BIONIC MUCUS DRAG REDUCTION OF UNDERWATER VEHICLE

2020 ◽  
Vol 47 (4) ◽  
pp. 371-385
Author(s):  
Kaisheng Zhang ◽  
Chaofan Ma ◽  
Baocheng Zhang ◽  
Bo Zhao ◽  
Qiang Wang
Keyword(s):  
Numerical Simulation ◽  
Drag Reduction ◽  
Simulation Study ◽  
Underwater Vehicle

Modeling of mass transfer in biofilms in oscillatory flow conditions using k-ɛ turbulence model

2003 ◽  
Vol 3 (1-2) ◽  
pp. 201-207
Author(s):  
H. Nagaoka ◽  
T. Nakano ◽  
D. Akimoto
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Turbulence Model ◽  
Uptake Rate ◽  
Oscillatory Flow ◽  
Substrate Uptake ◽  
Flow Conditions ◽  
Mass Transfer Mechanism ◽  
Substrate Uptake Rate ◽  
Good Agreement

The objective of this research is to investigate mass transfer mechanism in biofilms under oscillatory flow conditions. Numerical simulation of turbulence near a biofilm was conducted using the low Reynold’s number k-ɛ turbulence model. Substrate transfer in biofilms under oscillatory flow conditions was assumed to be carried out by turbulent diffusion caused by fluid movement and substrate concentration profile in biofilm was calculated. An experiment was carried out to measure velocity profile near a biofilm under oscillatory flow conditions and the influence of the turbulence on substrate uptake rate by the biofilm was also measured. Measured turbulence was in good agreement with the calculated one and the influence of the turbulence on the substrate uptake rate was well explained by the simulation.

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