An open-source density-based solver for two-phase CO2 compressible flows: Verification and validation

Since the early 1980s, Open Source Software (OSS) has gained a strong interest and an increased acceptance in the software industry that has to date initiated a “paradigm shift” (O’Reilly, 2004). The Open Source paradigm has introduced wholly new means of software development and distribution, creating a significant impact on the evolution of numerous business processes. In this chapter we examine the impact of the open source paradigm in the e-Procurement evolution and identify a trend towards Open Source e-Procurement Application Frameworks (AFs) which enable the development of tailored e-Procurement Solutions. Anchored in this notion, we present an Open-Source e-Procurement AF with a two-phase generation procedure. The innovative aspect of the proposed model relates to the combination of the Model Driven Engineering (MDE) approach with the Service-Oriented Architecture (SOA) paradigm for enabling the cost-effective production of e-Procurement Solutions by facilitating integration, interoperability, easy maintenance, and management of possible changes in the European e-Procurement environment. The assessment process of the proposed AF and its resulting e-Procurement Solutions occurs in the context of G2B in the Western-Balkan European region. Our evaluation yields positive results and further enhancing opportunities for the proposed Open Source e-Procurement AF and its resulting e-Procurement Solutions.

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An interface-sharpening method with adaptive mesh refinement for volume-of-fluid simulations of two-phase compressible flows

Computers & Fluids ◽

10.1016/j.compfluid.2020.104648 ◽

2020 ◽

Vol 210 ◽

pp. 104648 ◽

Cited By ~ 1

Author(s):

Qiang Li ◽

Fangmian Dong ◽

Larry K.B. Li

Keyword(s):

Adaptive Mesh Refinement ◽

Compressible Flows ◽

Mesh Refinement ◽

Adaptive Mesh ◽

Volume Of Fluid ◽

Two Phase

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Multi-Model Formulation for Compressible Multiphysics and Multiphase Flows: An Efficient Coupling Algorithm

Volume 1: Symposia, Parts A, B and C ◽

10.1115/fedsm2009-78034 ◽

2009 ◽

Author(s):

Julien Verhaegen ◽

Jacques Massoni ◽

Eric Daniel

Keyword(s):

Multiphase Flows ◽

Compressible Flows ◽

Computational Domain ◽

Two Phase ◽

Riemann Solvers ◽

Two Fluids ◽

Wave Patterns ◽

Efficient Coupling ◽

Coupling Algorithm ◽

Short Times

A coupling between a general multiphase flows model and a two-phase dilute flow model is presented. Both models are based on Eulerian approach (two fluids models) and compressible flows are considered. This coupling permits to solve problems in which a multiphase description (involving N phases) is necessary to obtain a good physical behavior of the flow on short times: it corresponds to a given location on the computational domain. Then the flow is developing and far from the location of the initial establishment of the flow, a simpler model can be used, for example a dilute two-phase model one. A methodology for coupling both models is necessary in order to get efficient calculations and a physical consistency. This coupling is not only a challenge regarding the computing resources or the programming. We also require that the wave patterns are correctly transmitted through the coupling interface. We then developed specific Riemann solvers that allow the transmission of acoustic or material waves. We also require the preservation of the conservative quantities such as mass, momentum and energy. The method is checked on ID case: propagation of uniform flows, shock tubes. Multidimensional problem are also presented, showing the efficiency of the coupling methodology regarding CPU time.

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A Commit Messages-Based Bug Localization for Android Applications

International Journal of Software Engineering and Knowledge Engineering ◽

10.1142/s0218194019500207 ◽

2019 ◽

Vol 29 (04) ◽

pp. 457-487 ◽

Cited By ~ 1

Author(s):

Tao Zhang ◽

Wenjun Hu ◽

Xiapu Luo ◽

Xiaobo Ma

Keyword(s):

Open Source ◽

Software Maintenance ◽

State Of The Art ◽

Bug Localization ◽

Two Phase ◽

Android Apps ◽

Bug Reports ◽

Android Applications ◽

The Given ◽

General Method

Recently, there has been consistent growth in Android applications (apps). Under these circumstances, software maintenance for Android apps becomes an essential and important task. The core of software maintenance is to locate bugs in source files. Previous bug localization approaches mainly focus on open-source desktop software (e.g. Eclipse, Mozilla, GCC). Even though a few studies locate the bugs in the Android apps, they are dedicated to a special app named ZXing, without developing a general method to locate the bugs in Android apps by taking into account the unique characteristics of Android apps’ bug reports. Such characteristics include fewer number of historical bug reports, insufficient detailed description, etc. These characteristics hinder existing localization approaches from being directly delivered to Android apps, because lack of enough information degrades the performance of those localization approaches relying on historical bug reports. Commit messages include more informative data which can provide the details of reported bugs. Therefore, in this paper, we propose a novel information retrieval-based approach which utilizes commit messages to locate new bugs in Android apps. This approach not only considers the structured textual similarity between the given bug and the candidate source files, but also computes the unstructured textual similarities between the new bug and the commit messages linked to the corresponding source files. According to the experimental results on 10 popular open-source Android apps managed by GitHub, our approach outperforms the state-of-the-art bug localization methods that include BugLocator, BLUiR, and two-phase model.

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Modeling and Simulation Study of Two-Phase Collaborative Behaviors Oriented to Open Source Design Process

Mathematical Problems in Engineering ◽

10.1155/2018/9347109 ◽

2018 ◽

Vol 2018 ◽

pp. 1-15

Author(s):

Shuo Zhang ◽

Yingzi Li

Keyword(s):

Product Development ◽

Open Source ◽

Design Process ◽

Partner Selection ◽

Product Development Process ◽

Structure Evolution ◽

Behavior Model ◽

Two Phase ◽

Multiagent Simulation ◽

Collaborative Behavior

Open source design (OSD) is an emerging cluster design mode based on Internet, and it takes full advantage of knowledge, technology, and resources among designers to promote product development. In this mode, designers’ behaviors of collaboration have important influence on product development process. In this paper, firstly collaboration flow including two types of collaboration relations between designers in open source design is depicted. Secondly, two-phase collaborative behavior model including partner selection and response is built by means of utility functions. At last, simulation experiment including 4 scenarios is designed based on open source project of mobile phone and conducted by multiagent simulation, and contrastive analysis is carried out to study collaboration behaviors’ impact on open source design process. The results show that the two-phase collaborative behavior model elaborately describes structure evolution of Open Source Community (OSC) as well as designers’ collaboration behaviors and that different ways of partner selection behaviors have significant impact on the evolution of OSD process as well as OSC structure. Furthermore, the results suggest that designers should better consider more the factor of matching degree between designers but less collaboration record.

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