Identification of Sustainable Locations in Pigeon Flights using Flow Simulation Method

2020 ◽  
Author(s):  
Margarita Zaleshina ◽  
Alexander Zaleshin
Keyword(s):  
Flow Simulation ◽  
Simulation Method

Stochastic simulation for determining the design flood of cascade reservoir systems

2012 ◽  
Vol 43 (1-2) ◽  
pp. 54-63 ◽  
Author(s):  
Baohong Lu ◽  
Huanghe Gu ◽  
Ziyin Xie ◽  
Jiufu Liu ◽  
Lejun Ma ◽  
...  
Keyword(s):  
Simulation Model ◽  
Stochastic Simulation ◽  
Southern China ◽  
Flow Simulation ◽  
Simulation Method ◽  
Simulation Approach ◽  
Design Flood ◽  
Design Values ◽  
Stochastic Simulation Model ◽  
The Impact

Stochastic simulation is widely applied for estimating the design flood of various hydrosystems. The design flood at a reservoir site should consider the impact of upstream reservoirs, along with any development of hydropower. This paper investigates and applies a stochastic simulation approach for determining the design flood of a complex cascade of reservoirs in the Longtan watershed, southern China. The magnitude of the design flood when the impact of the upstream reservoirs is considered is less than that without considering them. In particular, the stochastic simulation model takes into account both systematic and historical flood records. As the reliability of the frequency analysis increases with more representative samples, it is desirable to incorporate historical flood records, if available, into the stochastic simulation model. This study shows that the design values from the stochastic simulation method with historical flood records are higher than those without historical flood records. The paper demonstrates the advantages of adopting a stochastic flow simulation approach to address design-flood-related issues for a complex cascade reservoir system.

A Multi-Aspect Modeling Method for Service Flow Simulation Using Scene Transition Nets (STNs)

2012 ◽  
Author(s):  
Takeshi Tateyama ◽  
Satoshi Mikoshiba ◽  
Koji Kimita ◽  
Kentaro Watanabe ◽  
Ryosuke Chiba ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Flow Simulation ◽  
Simulation Method ◽  
Modeling Method ◽  
Nursing Service ◽  
Service Flow ◽  
Academic Field ◽  
Service Engineering ◽  
Field Service ◽  
Graphic Modeling

Recently, a new academic field, “service engineering” has been very actively investigated. However, there are few effective methods and tools to simulate and evaluate services designed based on the concept of service engineering. In the past, the authors proposed a service flow simulation method using scene transition nets (STN) which is a graphic modeling and simulation method for discrete-continuous hybrid systems. However, this method does not consider how to model and simulate complex service flows including multiple layered, parallel, and interrupted structures and it is difficult to construct STN models of such complex systems using the existing STN concepts. In this paper, the authors propose a new STN modeling method using “multi-aspect STN modeling “ concepts in order to provide easy methods for modeling of such complex services. The experimental results for the modeling and simulation of a nursing service demonstrate the effectiveness of the proposed method.

Service Flow Simulation Using Scene Transition Nets (STN) Including Satisfaction-Attribute Value Functions

2010 ◽  
Author(s):  
Takeshi Tateyama ◽  
Satoshi Mikoshiba ◽  
Yoshiki Shimomura ◽  
Seiichi Kawata
Keyword(s):  
Customer Satisfaction ◽  
Hybrid Systems ◽  
Manufacturing Systems ◽  
Flow Simulation ◽  
Simulation Method ◽  
Service Industries ◽  
Service Flow ◽  
Service Engineering ◽  
Multi Agent ◽  
Attribute Value

A new academic field, “service engineering” has emerged; it involves active investigation for increasing the productivities of service industries. However, there are only a few effective tools for the simulation and evaluation of complex services that have been designed using concepts from the field of service engineering. To overcome this shortcoming, the authors propose a multi-agent service flow simulation method using scene transition nets (STNs) that is a very useful graphical modeling and simulation method for application to discrete-continuous hybrid systems. This method treats services as complicated multi-agent and hybrid systems similar to manufacturing systems. To obtain realistic values of customer satisfaction, the authors input satisfaction-attribute value (S-AV) functions, which are often used in service engineering in service flow models using STN. This method visualizes discrete flows of services and temporal changes in the values of customer satisfaction and various other variables of service models. The authors present the results of the simulation of an online DVD rental service involving multiple agents to show the effectiveness of the proposed method that uses an STN GUI simulator developed by them.

scholarly journals Run-out Effects of Debris Flows Based on Numerical Simulation

2016 ◽  
Vol 10 (1) ◽  
pp. 848-858
Author(s):  
Jun Wang ◽  
Yan Yu ◽  
Xinfeng Wei ◽  
Qinghua Gong ◽  
Haixian Xiong
Keyword(s):  
Numerical Simulation ◽  
Land Use ◽  
Debris Flow ◽  
Debris Flows ◽  
Flow Simulation ◽  
Simulation Method ◽  
Disaster Mitigation ◽  
Return Periods ◽  
Spatial Risk ◽  
Simulation Results

Debris flows are a common natural disaster in mountainous areas and often cause severe casualties and property loss. Debris-flow run-out effects analysis can provide an idea of the spatial risks posed to the downstream area of a debris flow, which is extremely important for local populations’ lives, disaster mitigation and planning the layout of economic construction. The objective of this study is to develop a new method to quantify debris flow run-out effects by combining debris flow simulation results and data for different types of land use within the inundated area. After a three-dimensional numerical simulation platform was established, the numerical simulation method was applied as a modeling tool to simulate the inundated areas and final buried depths under rainfalls with different return periods. The simulated result for flow depth under a 100-year return period rainfall event was validated based on field measurements. Finally, the debris-flow run-out effects under different return periods were analyzed by combining the simulation results and land use data. The proposed method can enhance the accuracy of debris-flow spatial risk assessment and has great value for application.

scholarly journals Simplified Simulation Method for Flood-Induced Bend Scour—A Case Study Near the Shuideliaw Embankment on the Cho-Shui River

2017 ◽  
Author(s):  
Wen-Dar Guo ◽  
Jian-Hao Hong ◽  
Cheng-Hsin Chen ◽  
Chih-Chiang Su ◽  
Jihn-Sung Lai
Keyword(s):  
Flow Simulation ◽  
Field Measurements ◽  
Practical Method ◽  
Simulation Method ◽  
Water Levels ◽  
Two Dimensional ◽  
Short Term ◽  
Common Causes ◽  
Two Dimensional Flow

The modeling of flood-induced bend scour near embankment toes can provide important information for river engineering, embankment safety warnings, and emergency action management. During the rainy seasons, short-term general scour and bend scour are the most common causes for the failure of reinforced concrete embankments in Taiwan. To gain a deeper understanding of the scouring process near levee foundations, this study proposed a straightforward and practical method for bend scour simulation. The proposed simulation method is subdivided into three stages: two-dimensional flow simulation, general scour estimation, and bend scour estimation. A new bend-scour computation equation is proposed and incorporated into a two-dimensional hydraulic finite-volume model for simulating the evolution of bend scour depth around embankment toes. The proposed method is applied to simulate the temporal evolution of bend scouring near the Shuideliaw Embankment on the Cho-Shui River in Taiwan, where serious failure occurred during the June 2012 monsoon. Field data were gathered using the numbered-brick technique at the Shuideliaw Embankment to demonstrate the accuracy of the proposed method. The results of the bend scour simulations compared reasonably well with field measurements, indicating close agreement in terms of water levels and bend scour depths near the Shuideliaw Embankment. The proposed method was found to quickly estimate the maximum short-term general scour and bend scour depths for further enhancement of the safety of the embankment toe.

Study on Torque Converter with Adjustable Guide Vanes of Hydrodynamic Speed-Adjusting Wind Turbines

2012 ◽  
Vol 605-607 ◽  
pp. 453-457
Author(s):  
Wei Cai ◽  
Wen Xing Ma ◽  
Chun Bao Liu ◽  
Wei Wei Du
Keyword(s):  
Wind Turbine ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Simulation Method ◽  
Torque Converter ◽  
Transmission System ◽  
Variable Speed ◽  
Core Component ◽  
Three Dimensional Flow ◽  
Guide Vanes

As the core component of hydrodynamic variable speed transmission system of wind turbine, there exist some problems in domestic adjustable torque converter, such as simple products and poor performances. A three-dimensional flow simulation method is employed to design the adjustable torque converter. Circulatory circle is determined after the structure optimization of the torque converter. The blades are designed by the conformal projection law, and then the adjustable device’s structure is determined. The performance of torque converter with the variation guide vanes is analyzed by using numerical simulation. The calculated results show that the new torque converter could meet the needs of the wind turbine transmission system.

Aspects of Multiscale Flow Simulation with Potential to Enhance Reservoir Engineering Practice

2021 ◽  
Author(s):  
Sanjoy Kumar Khataniar ◽  
Daniel De Brito Dias ◽  
Rong Xu
Keyword(s):  
High Performance ◽  
Flow Simulation ◽  
Field Testing ◽  
Simulation Method ◽  
Reservoir Engineering ◽  
Engineering Practice ◽  
Data Sets ◽  
Fully Implicit ◽  
Representative Model ◽  
Reservoir Simulator

Abstract A new implementation of a multiscale sequential fully implicit (MS SFI) reservoir simulation method is applied to a set of reservoir engineering problems to understand its utility. An assessment is made to highlight areas where the approach brings substantial advantage in performance as well as address problems not successfully resolved by existing methods. This work makes use of the first ever implementation of the multiscale sequential fully implicit method in a commercial reservoir simulator. The key features of the method and implementation are briefly discussed. The learnings gained during field testing and commercialization on about forty real world models is illustrated through simpler, but representative data sets, available in the public domain. The workhorse robust fully implicit (FI) method is used as a reference for benchmarking. The MS SFI method can faithfully reproduce FI results for black oil problems. We conclude that the MS SFI method has the capability to support reservoir engineering decision making especially in the areas of subsurface uncertainty quantification, representative model selection, model calibration and optimization. The MS SFI method shows immense potential for handling prominent levels of reservoir heterogeneity. The challenge of including fine-scale heterogeneity, which is often overlooked, when scaling up EOR processes from laboratory to field, appears to have found a practical solution with a combination of MS SFI and high-performance computing (HPC).

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