Experimental and Numerical Investigation of the DrivAer Model

2012 ◽  
Author(s):  
Angelina I. Heft ◽  
Thomas Indinger ◽  
Nikolaus A. Adams
Keyword(s):  
Flow Field ◽  
Numerical Simulations ◽  
Open Source ◽  
Numerical Investigation ◽  
Open Source Software ◽  
The Other ◽  
Interference Effects ◽  
Aerodynamic Optimization ◽  
Car Model ◽  
High Degree

Automotive aerodynamic research often focuses on strongly simplified car models, such as the Ahmed body and the SAE model. Due to their high degree of abstraction, however, interference effects are often neglected which leads to an unrealistic representation of the flow field. Consequently, these results cannot be directly used for the aerodynamic optimization of production vehicles. On the other hand, aerodynamic investigations of real production vehicles are often limited due to the restricted availability of the geometric data. Therefore, a new realistic generic car model for aerodynamic research — the DrivAer body — is proposed. This paper focuses on the development of the model, summarizes first experimental results of the different configurations of the fastback geometry and compares them to numerical simulations performed using the open source software OpenFOAM®.

Virtual Reconstruction as Archaeological Observation: Embracing New Ways of Treating Sites, Places and Landscapes

2019 ◽  
Vol 7 (2) ◽  
pp. 127-139 ◽  
Author(s):  
Matthew J. Douglass ◽  
Zachary R. Day ◽  
Jeremy C. Brunette ◽  
Peter Bleed ◽  
Douglas Scott
Keyword(s):  
Open Source ◽  
Case Studies ◽  
Open Source Software ◽  
The Other ◽  
Digital Tools ◽  
Archaeological Heritage ◽  
Common Heritage ◽  
Online Tutorials ◽  
Virtual Reconstruction ◽  
Southern Oklahoma

AbstractVirtual Reconstruction is a powerful tool broadly suited to a diverse array of archaeological heritage applications. In practice, however, reconstruction has largely focused on grand and monumental sites. Here we present two case studies–one from southern Oklahoma, the other from western Nebraska–to explore the use of this technology for more common heritage applications. The goal of this article is to advertise the dilemma we faced with communicating information on ephemeral sites and how we, as nonspecialists, solved the issue using affordable and accessible digital tools. Our workflow makes use of common tools (GIS) and open source software and online tutorials provide step by step instruction to support its replication. In presenting our experiences and the results of these efforts, we hope to spur similar applications in the use of Virtual Reconstruction to communicate information on archaeological heritage more broadly.

Numerical Study of the inside Flow Field and the Rectangle Channel Impeller of Roto-Jet Pump

2014 ◽  
Vol 529 ◽  
pp. 164-168 ◽  
Author(s):  
Wei Zang ◽  
Xin Cheng Li ◽  
Yi Chen ◽  
Yu Ting Luo
Keyword(s):  
Flow Field ◽  
Numerical Simulations ◽  
Numerical Study ◽  
The Other ◽  
Jet Pump ◽  
Hydraulic Models ◽  
Flow Channels ◽  
Ansys Cfx ◽  
Angle Blade

By means of ANSYS-CFX, the 3D numerical simulations of flow field for the three hydraulic models are performed. Through comparing the three types of pumps with three different rectangle channel impellers which have different spread angle, blade, the authors draw conclusions: the distribution of the pressure and velocity in the rectangle flow channels with 6° spread angle is well-proportioned, the head and the efficiency of the whole pump can meet the requirement: But the other two types of impeller channels, the distribution of velocity is unstable, there are backflow and big whirlpool. Therefore, the rectangle channel impeller with 6°spread angle is a better type for the Roto-Jet pump.

scholarly journals Programming style and teaching internationalisation of programms

2010 ◽  
Vol 51 ◽  
Author(s):  
Viktoras Dagys ◽  
Gintautas Grigas
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Linguistic Diversity ◽  
Native Language ◽  
The Other ◽  
Basic Knowledge ◽  
School Students

The possibilities to introduce school students to software internationalization element are discussed. The basic knowledge of internalization can be provided in the forma of simple practical tasks of programming. The software internalization learning is a multi-topic: students gain understanding of internationalization and localization of programs, enough knowledge to be able to test actually used programs, especially open source software (this could be a serious motivation), they learn about the world’s linguistic diversity, realize deeper meaning of native language and its place among the other languages.

Curious Exceptions?

2012 ◽  
Vol 4 (4) ◽  
pp. 44-55
Author(s):  
Alessandro Nuvolari ◽  
Francesco Rullani
Keyword(s):  
Public Goods ◽  
Open Source ◽  
Open Source Software ◽  
Research Agenda ◽  
The Other ◽  
Successful Operation ◽  
Fourth Section ◽  
The Third ◽  
Wide Range ◽  
Economic Reasoning

The aim of this article is to explore the differences and commonalities between open source software and other cases of open technology. The concept of open technology is used here to indicate various models of innovation based on the participation of a wide range of different actors who freely share the innovations they have produced. The article begins with a review of the problems connected to the production of public goods and explains why open source software seems to be a “curious exception” for traditional economic reasoning. Then it describes the successful operation of similar models of innovation (open technology) in other technological fields. The third section investigates the literature in relation to three fundamental issues in the current open source research agenda, namely, developers’ motivations, performance, and sustainability of the model. Finally, the fourth section provides a final comparison between open source software and the other cases of open technology.

Numerical Investigation of Hollow Metal Cross Section Profiles on Impact

2011 ◽  
Vol 383-390 ◽  
pp. 3241-3248 ◽  
Author(s):  
Waluyo Adi Siswanto ◽  
Badrul Omar ◽  
Shamsir Shukri
Keyword(s):  
Open Source ◽  
Numerical Investigation ◽  
Cross Section ◽  
Cross Sections ◽  
Open Source Software ◽  
Rigid Wall ◽  
Axial Mode ◽  
Hexagonal Shape ◽  
Vehicle Structure ◽  
Hollow Metal

A front bumper of a car is attached to the main vehicle structure by using hollow metals. This paper investigates various cross section profiles that can be used as bumper attachments. Several cross section profiles with the same circumscribe are firstly selected, i.e. round, square, triangular and hexagonal shape cross sections. Each model is then numerically impacted in an axial mode as if it is crashed into a rigid wall with an impacting velocity of 10 m/s or equivalent to 36 m/s. A dynamic-explicit open source software Impact is employed to do the simulation. The displacement results are monitored in the first 1:8ms then compared to the models that can absorb better showing the less displaced in certain examination nodes. The results shows that the triangle cross section performs better compared to other cross sections.

scholarly journals Curious Exceptions? Open Source Software and "Open" Technology

2011 ◽  
pp. 227-239 ◽  
Author(s):  
Alessandro Nuvolari ◽  
Francesco Rullani
Keyword(s):  
Public Goods ◽  
Open Source ◽  
Open Source Software ◽  
Research Agenda ◽  
The Other ◽  
Successful Operation ◽  
Fourth Section ◽  
The Third ◽  
Wide Range ◽  
Economic Reasoning

The aim of this chapter is to explore the differences and commonalities between open source software and other cases of open technology. The concept of open technology is used here to indicate various models of innovation based on the participation of a wide range of different actors who freely share the innovations they have produced. The chapter begins with a review of the problems connected to the production of public goods and explains why open source software seems to be a “curious exception” for traditional economic reasoning. Then it describes the successful operation of similar models of innovation (open technology) in other technological fields. The third section investigates the literature in relation to three fundamental issues in the current open source research agenda, namely, developers’ motivations, performance, and sustainability of the model. Finally, the fourth section provides a final comparison between open source software and the other cases of open technology.

scholarly journals Analysis of Open Source Simulation Applications

2020 ◽  
Vol 7 (12) ◽  
pp. 292-306
Author(s):  
Balaji Janamanchi
Keyword(s):  
Operating System ◽  
Open Source ◽  
Open Source Software ◽  
Simulation Modeling ◽  
End Users ◽  
The Other ◽  
Online Service ◽  
Science And Engineering ◽  
Software Application ◽  
Modeling Software

This study seeks to understanding the growth and popularity of Open Source Software (OSS) development for simulation modeling under Science and Engineering domain on SourceForge online service platform. The objectives include understanding the importance, if any, of the features such as, license type, programming language, Operating System version, review rating in influencing the popularity of a given software application as measured by downloads. For obvious reasons, end-users select and adopt specific applications based on their usage needs and the suitability of a given application in meeting their needs. Nevertheless, some applications may be easily adoptable than the other given the different options available for customization as well as scalability opportunities present in an application. So, other factors remaining common, popularity gained by an application with the increased downloads tends to draw prospective users to a specific application more than the others. This study analyses the availability and accessibility of simulation modeling software on the Source Forge website, undeniably, a very large repository of open source software resources. Limiting the search to “Simulations” within “Science and Engineering” domain /category. The top 250 applications’ data is downloaded and analyzed. Useful insights and metrics are developed and compiled to assist end-users to understand the profile of open source simulation applications available for users for free downloads.

scholarly journals Discovery layer decisions, configurations and strategies

Bibliosphere ◽  
2020 ◽  
pp. 83-95
Author(s):  
R. Schwartz
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
Academic Libraries ◽  
Academic Library ◽  
Usability Testing ◽  
Product Type ◽  
The Other ◽  
Implementation Processes ◽  
American Academic

The problem that patrons frequently encounter with searching via a discovery layer linked to a knowledgebase is the overwhelming number of hits. Few if any research or discussion compares how libraries resolve this difficulty. To begin a discussion, the author disseminated an open invitation for academic libraries to participate on three panels from October 2018 to June 2019 to discuss their implementation processes and decisions. Five academic libraries accepted the invitation. This paper reviews the approaches of the five American academic library systems with the intent to encourage further examination of the issues of design, implementation, and maintenance of discovery layers. The conclusions reached point to the evolving nature of discovery layer interfaces and the struggle for libraries to adapt their needs to this still changing product type. Within this group, the larger institutions with more financial and staff resources have designed a ‘’bento box’’ interface with open source software, while the other institutions with lesser means have chosen to create different instances of their subscribed proprietary discovery layers to meet their specific institutional demands and the specific needs of their patrons. A statistically relevant examination with rigorous comparison of usability testing would have to be done to see how these and other factors play out in the wider field.

Intelligent DNS for Accelerating Web Access to University with Multi-Exports

2014 ◽  
Vol 543-547 ◽  
pp. 2911-2914
Author(s):  
Zhi Yong Li ◽  
Bao Wei Ren ◽  
Li Ming Xiao
Keyword(s):  
Open Source ◽  
Open Source Software ◽  
The Other ◽  
Slow Speed ◽  
Method Base ◽  
Web Access ◽  
Improve Access

In this paper, the intelligent DNS is introduced to resolve user having slow campus internet speed when access our campus website. Our campus has three exports, connected to the CERNET, the Telecom and the Unicom respectively. The campus website is usually resolves to the CERNET, this led to when user from the other ISP accessing campus website, it need across different ISP, but across different ISP take more time, so resulted in slow speed problem. To solve the problem, we design and implement an intelligent DNS method base on open source software squid and BIND. Practical results show that this method can improve access speed effectively, and enhance the security of website.

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