**Commenced**in January 2007

**Frequency:**Monthly

**Edition:**International

**Paper Count:**3057

# Search results for: energy flows.

##### 3057 Simulation for Input-Output Energy Structure in Agriculture: Bangladesh

**Authors:**
M. S. Alam,
M. R. Alam,
Nusrat Jahan Imu

**Abstract:**

This paper presents a computer simulation model based on system dynamics methodology for analyzing the dynamic characteristics of input energy structure in agriculture and Bangladesh is used here as a case study for model validation. The model provides an input energy structure linking the major energy flows with human energy and draft energy from cattle as well as tractors and/or power tillers, irrigation, chemical fertilizer and pesticide. The evaluation is made in terms of different energy dependent indicators. During the simulation period, the energy input to agriculture increased from 6.1 to 19.15 GJ/ha i.e. 2.14 fold corresponding to energy output in terms of food, fodder and fuel increase from 71.55 to 163.58 GJ/ha i.e. 1.28 fold from the base year. This result indicates that the energy input in Bangladeshi agricultural production is increasing faster than the energy output. Problems such as global warming, nutrient loading and pesticide pollution can associate with this increasing input. For an assessment, a comparative statement of input energy use in agriculture of developed countries (DCs) and least developed countries (LDCs) including Bangladesh has been made. The performance of the model is found satisfactory to analyze the agricultural energy system for LDCs

**Keywords:**
Agriculture,
energy indicator,
system dynamics,
energy flows.

##### 3056 The Ethics of Instream Flows: Science and Policy in Southern Alberta, Canada

**Authors:**
Jeremy J. Schmidt

**Abstract:**

**Keywords:**
ethics,
instream flows,
policy,
science,
watermanagement

##### 3055 Fluid Flow and Heat Transfer Structures of Oscillating Pipe Flows

**Authors:**
Yan Su,
Jane H. Davidson,
F. A. Kulacki

**Abstract:**

**Keywords:**
Keulegan-Carpenter number,
Nusselt number,
Oscillating pipe flows,
Reynolds number

##### 3054 Experimental Investigation of S-Rotors in Open and Bounded Flows

**Authors:**
Hussain H. Al-Kayiem,
Goh Jin Ming

**Abstract:**

**Keywords:**
Bounded Flows,
Savonius Rotor,
Wind Turbine,
Wind energy,
VAWT

##### 3053 Linear Instability of Wake-Shear Layers in Two-Phase Shallow Flows

**Authors:**
Inta Volodko,
Valentina Koliskina

**Abstract:**

**Keywords:**
Linear stability,
Shallow flows,
Wake-shear flows.

##### 3052 Application of Universal Distribution Factors for Real-Time Complex Power Flow Calculation

**Authors:**
Abdullah M. Alodhaiani,
Yasir A. Alturki,
Mohamed A. Elkady

**Abstract:**

Complex power flow distribution factors, which relate line complex power flows to the bus injected complex powers, have been widely used in various power system planning and analysis studies. In particular, AC distribution factors have been used extensively in the recent power and energy pricing studies in free electricity market field. As was demonstrated in the existing literature, many of the electricity market related costing studies rely on the use of the distribution factors. These known distribution factors, whether the injection shift factors (ISF’s) or power transfer distribution factors (PTDF’s), are linear approximations of the first order sensitivities of the active power flows with respect to various variables. This paper presents a novel model for evaluating the universal distribution factors (UDF’s), which are appropriate for an extensive range of power systems analysis and free electricity market studies. These distribution factors are used for the calculations of lines complex power flows and its independent of bus power injections, they are compact matrix-form expressions with total flexibility in determining the position on the line at which line flows are measured. The proposed approach was tested on IEEE 9-Bus system. Numerical results demonstrate that the proposed approach is very accurate compared with exact method.

**Keywords:**
Distribution Factors,
Power System,
Sensitivity Factors,
Electricity Market.

##### 3051 Energy Recovery from Swell with a Height Inferior to 1.5 m

**Authors:**
A. Errasti,
F. Doffagne,
O. Foucrier,
S. Kao,
A. Meigne,
H. Pellae,
T. Rouland

**Abstract:**

Renewable energy recovery is an important domain of research in past few years in view of protection of our ecosystem. Several industrial companies are setting up widespread recovery systems to exploit wave energy. Most of them have a large size, are implanted near the shores and exploit current flows. However, as oceans represent 70% of Earth surface, a huge space is still unexploited to produce energy. Present analysis focuses on surface small scale wave energy recovery. The principle is exactly the opposite of wheel damper for a car on a road. Instead of maintaining the car body as non-oscillatory as possible by adapted control, a system is designed so that its oscillation amplitude under wave action will be maximized with respect to a boat carrying it in view of differential potential energy recuperation. From parametric analysis of system equations, interesting domains have been selected and expected energy output has been evaluated.

**Keywords:**
Small scale wave,
potential energy,
optimized energy recovery,
auto-adaptive system.

##### 3050 Linear Stability Characteristics of Wake-Shear Layers in Two-Phase Shallow Flows

**Authors:**
Inta Volodko,
Valentina Koliskina

**Abstract:**

**Keywords:**
Linear stability,
Shallow flows,
Wake-shear flows.

##### 3049 Numerical Analysis of Oil-Water Transport in Horizontal Pipes Using 1D Transient Mathematical Model of Thermal Two-Phase Flows

**Authors:**
Evgeniy Burlutskiy

**Abstract:**

**Keywords:**
Mathematical model,
Oil-Water,
Pipe flows.

##### 3048 The Boundary Theory between Laminar and Turbulent Flows

**Authors:**
Tomasz M. Jankowski

**Abstract:**

**Keywords:**
Freed gravitons,
free gravitons.

##### 3047 Ginzburg-Landau Model : an Amplitude Evolution Equation for Shallow Wake Flows

**Authors:**
Imad Chaddad,
Andrei A. Kolyshkin

**Abstract:**

**Keywords:**
Ginzburg-Landau equation,
shallow wake flow,
weakly nonlinear theory.

##### 3046 EAAC: Energy-Aware Admission Control Scheme for Ad Hoc Networks

**Authors:**
Dilip Kumar S.M,
Vijaya Kumar B.P.

**Abstract:**

**Keywords:**
Ad hoc networks,
admission control,
energy-aware
routing,
Quality-of-Service,
future residual energy,
neural network.

##### 3045 A New Scheduling Algorithm Based on Traffic Classification Using Imprecise Computation

**Authors:**
Farzad Abtahi,
Sahar Khanmohamadi,
Bahram Sadeghi Bigham

**Abstract:**

**Keywords:**
Data communication,
Real-time,
Scheduling,
Video
transport.

##### 3044 Lattice Boltzmann Method for Turbulent Heat Transfer in Wavy Channel Flows

**Authors:**
H.Y. Lai,
S. C. Chang,
W. L. Chen

**Abstract:**

The hydrodynamic and thermal lattice Boltzmann methods are applied to investigate the turbulent convective heat transfer in the wavy channel flows. In this study, the turbulent phenomena are modeling by large-eddy simulations with the Smagorinsky model. As a benchmark, the laminar and turbulent backward-facing step flows are simulated first. The results give good agreement with other numerical and experimental data. For wavy channel flows, the distribution of Nusselt number and the skin-friction coefficients are calculated to evaluate the heat transfer effect and the drag force. It indicates that the vortices at the trough would affect the magnitude of drag and weaken the heat convection effects on the wavy surface. In turbulent cases, if the amplitude of the wavy boundary is large enough, the secondary vortices would be generated at troughs and contribute to the heat convection. Finally, the effects of different Re on the turbulent transport phenomena are discussed.

**Keywords:**
Heat transfer,
lattice Boltzmann method,
turbulence,
wavy channel.

##### 3043 Optimizing Network Latency with Fast Path Assignment for Incoming Flows

**Abstract:**

**Keywords:**
Latency,
Fast path assignment,
Bottleneck link.

##### 3042 A Utilitarian Approach to Modeling Information Flows in Social Networks

**Authors:**
Usha Sridhar,
Sridhar Mandyam

**Abstract:**

**Keywords:**
Borch's Theorem ,
Economic value of information,
Information Exchange,
Pareto Optimal Solution,
Social Networks,
Utility Functions

##### 3041 On Asymptotic Laws and Transfer Processes Enhancement in Complex Turbulent Flows

**Authors:**
A. Gorin

**Abstract:**

**Keywords:**
impinging jets,
packed beds,
turbulent separatedflows,
'two-thirds power law'

##### 3040 An Exploratory Study for Seamless Overland Logistics Information Flows and Connection: An In-Depth Case Study of Korea

**Authors:**
Jae Un Jung,
Hyun Soo Kim,
Doo Hwan Kim

**Abstract:**

Quick and qualitative services are not new issues anymore in Logistics but those are still important problems along with cost-cutting. Related to the issues, though advanced information technologies are introduced unceasingly from laboratories, yet there is long way to go for smooth and seamless information flows on physical distribution processes in the industrial field. For the reason, the study aims to seek an advanced information delivery and management strategy through an in-depth case study of a Korea intermodal transportation company. It provides an industrial reference and a way to improve the endemic problems of logistics information systems.

**Keywords:**
Exploratory Study,
Overland Logistics,
Information Flows,
Seamless Connectivity.

##### 3039 Research on the Correlation of the Fluctuating Density Gradient of the Compressible Flows

**Authors:**
Yasuo Obikane

**Abstract:**

**Keywords:**
Turbulence Modeling ,
Density Gradient Correlation,
Compressible

##### 3038 Logistical Optimization of Nuclear Waste Flows during Decommissioning

**Authors:**
G. Dottavio,
M. F. Andrade,
F. Renard,
V. Cheutet,
A.-L. L. S. Vercraene,
P. Hoang,
S. Briet,
R. Dachicourt,
Y. Baizet

**Abstract:**

An important number of technological equipment and high-skilled workers over long periods of time have to be mobilized during nuclear decommissioning processes. The related operations generate complex flows of waste and high inventory levels, associated to information flows of heterogeneous types. Taking into account that more than 10 decommissioning operations are on-going in France and about 50 are expected toward 2025: A big challenge is addressed today. The management of decommissioning and dismantling of nuclear installations represents an important part of the nuclear-based energy lifecycle, since it has an environmental impact as well as an important influence on the electricity cost and therefore the price for end-users. Bringing new technologies and new solutions into decommissioning methodologies is thus mandatory to improve the quality, cost and delay efficiency of these operations. The purpose of our project is to improve decommissioning management efficiency by developing a decision-support framework dedicated to plan nuclear facility decommissioning operations and to optimize waste evacuation by means of a logistic approach. The target is to create an easy-to-handle tool capable of i) predicting waste flows and proposing the best decommissioning logistics scenario and ii) managing information during all the steps of the process and following the progress: planning, resources, delays, authorizations, saturation zones, waste volume, etc. In this article we present our results from waste nuclear flows simulation during decommissioning process, including discrete-event simulation supported by FLEXSIM 3-D software. This approach was successfully tested and our works confirms its ability to improve this type of industrial process by identifying the critical points of the chain and optimizing it by identifying improvement actions. This type of simulation, executed before the start of the process operations on the basis of a first conception, allow ‘what-if’ process evaluation and help to ensure quality of the process in an uncertain context. The simulation of nuclear waste flows before evacuation from the site will help reducing the cost and duration of the decommissioning process by optimizing the planning and the use of resources, transitional storage and expensive radioactive waste containers. Additional benefits are expected for the governance system of the waste evacuation since it will enable a shared responsibility of the waste flows.

**Keywords:**
Nuclear decommissioning,
logistical optimization,
decision-support framework,
waste management.

##### 3037 Tumble Flow Analysis in an Unfired Engine Using Particle Image Velocimetry

**Authors:**
B. Murali Krishna,
J. M. Mallikarjuna

**Abstract:**

**Keywords:**
In-cylinder flow,
Dome piston,
Cavity,
Tumble,
PIV

##### 3036 Compressible Lattice Boltzmann Method for Turbulent Jet Flow Simulations

**Authors:**
K. Noah,
F.-S. Lien

**Abstract:**

In Computational Fluid Dynamics (CFD), there are a variety of numerical methods, of which some depend on macroscopic model representatives. These models can be solved by finite-volume, finite-element or finite-difference methods on a microscopic description. However, the lattice Boltzmann method (LBM) is considered to be a mesoscopic particle method, with its scale lying between the macroscopic and microscopic scales. The LBM works well for solving incompressible flow problems, but certain limitations arise from solving compressible flows, particularly at high Mach numbers. An improved lattice Boltzmann model for compressible flow problems is presented in this research study. A higher-order Taylor series expansion of the Maxwell equilibrium distribution function is used to overcome limitations in LBM when solving high-Mach-number flows. Large eddy simulation (LES) is implemented in LBM to simulate turbulent jet flows. The results have been validated with available experimental data for turbulent compressible free jet flow at subsonic speeds.

**Keywords:**
Compressible lattice Boltzmann metho-,
large eddy simulation,
turbulent jet flows.

##### 3035 Generalization of SGIP Surface Tension Force Model in Three-Dimensional Flows and Compare to Other Models in Interfacial Flows

**Authors:**
Afshin Ahmadi Nadooshan,
Ebrahim Shirani

**Abstract:**

##### 3034 Air Flows along Perforated Metal Plates with the Heat Transfer

**Abstract:**

**Keywords:**
Perforations,
convective heat transfers,
turbulent
flows,
numerical simulations.

##### 3033 Verification of K-ω SST Turbulence Model for Supersonic Internal Flows

**Abstract:**

**Keywords:**
CFD simulations,
color Schlieren,
k-ω SST,
supersonic flows,
shock waves.

##### 3032 Computer-Assisted Management of Building Climate and Microgrid with Model Predictive Control

**Authors:**
Vinko Lešić,
Mario Vašak,
Anita Martinčević,
Marko Gulin,
Antonio Starčić,
Hrvoje Novak

**Abstract:**

**Keywords:**
Energy-efficient buildings,
Hierarchical model
predictive control,
Microgrid power flow optimization,
Price-optimal
building climate control.

##### 3031 Numerical Simulation of a Single Air Bubble Rising in Water with Various Models of Surface Tension Force

**Authors:**
Afshin Ahmadi Nadooshan,
Ebrahim Shirani

**Abstract:**

Different numerical methods are employed and developed for simulating interfacial flows. A large range of applications belong to this group, e.g. two-phase flows of air bubbles in water or water drops in air. In such problems surface tension effects often play a dominant role. In this paper, various models of surface tension force for interfacial flows, the CSF, CSS, PCIL and SGIP models have been applied to simulate the motion of small air bubbles in water and the results were compared and reviewed. It has been pointed out that by using SGIP or PCIL models, we are able to simulate bubble rise and obtain results in close agreement with the experimental data.

**Keywords:**
Volume-of-Fluid,
Bubble Rising,
SGIP model,
CSS model,
CSF model,
PCIL model,
interface,
surface tension force.

##### 3030 Particle Simulation of Rarefied Gas Flows witha Superimposed Wall Surface Temperature Gradient in Microgeometries

**Authors:**
V. Azadeh Ranjbar

**Abstract:**

**Keywords:**
DSMC,
Thermal transpiration,
Thermal creep,
MEMS,
Knudsen Compressor.

##### 3029 Some Rotational Flows of an Incompressible Fluid of Variable Viscosity

**Authors:**
Rana Khalid Naeem,
Waseem Ahmed Khan,
Muhammad Akhtar,
Asif Mansoor

**Abstract:**

The Navier Stokes Equations (NSE) for an incompressible fluid of variable viscosity in the presence of an unknown external force in Von-Mises system x,\ are transformed, and some new exact solutions for a class of flows characterized by equation y f x a\b for an arbitrary state equation are determined, where f x is a function, \ the stream function, a z 0 and b are the arbitrary constants. In three, out of four cases, the function f x is arbitrary, and the solutions are the solutions of the flow equations for all the flows characterized by the equationy f x a\b. Streamline patterns for some forms of f x in unbounded and bounded regions are given.

**Keywords:**
Bounded and unbounded region,
Exact solution,
Navier Stokes equations,
Streamline pattern,
Variable viscosity,
Von- Mises system

##### 3028 Onset Velocity Profiles Evolution in Microchannels

**Authors:**
Cătălin Mărculescu,
Andrei Avram,
Cătălin Pârvulescu,
Marioara Avram,
Cătălin Mihai Bălan

**Abstract:**

**Keywords:**
Micro-PIV,
numerical investigations,
secondary flows,
velocity profiles.