Vortex force of an impulsively started plate at high angle of attack

2017 ◽  
Vol 27 (11) ◽  
pp. 2402-2414
Author(s):  
Xiang Fu ◽  
Gaohua Li ◽  
Fuxin Wang
Keyword(s):  
Aerodynamic Force ◽  
Angle Of Attack ◽  
Leading Edge ◽  
Aerodynamic Forces ◽  
Total Drag ◽  
Content Type ◽  
Vortical Structures ◽  
Edge Vortex ◽  
The Individual ◽  
Practical Implications

Purpose A quantitative study that can identify the primary aerodynamic forces and relate them to individual vortical structures is lacking. The paper aims to clarify the quantitative relationships between the aerodynamic forces and vortical structures. Design/methodology/approach The various contributions to the aerodynamic forces on the two-dimensional impulsively started plate are investigated from the perspective of the vorticity moment theorem. The angles of attacks are set to 45°, 58.5° and 72°, while the Reynolds number is 10,000 based on the chord length. Compared with the traditional pressure force analysis, this theorem not only tells us the total aerodynamic force during the motion, but also enables us to quantify the forces contributed from the fluid elements with non-zero vorticity. Findings It is found that the time-dependent force behaviors are dominated by the formations and evolutions of these vortical structures. The analysis of the time-averaged forces demonstrates that the lift contributed from the leading edge vortex (LEV) is nearly four times larger than the total lift and the drag contributed from the starting vortex (SV) is almost equal to the total drag when the angle of attack (AoA) increases to 72°, which means the LEV is “lift structure” whereas the SV is “drag structure”. Practical implications The present method provides a better perspective for flow control and drag reduction by relating the forces directly to the individual vorticity structures. Originality/value In this paper, the Vorticity Moment Theory is first used to study the quantitative relationships between the aerodynamic forces and the vortices.

Entrepreneurship in regions: differentiated impacts of the socio cultural and gender types

2015 ◽  
Vol 28 (1) ◽  
pp. 45-76 ◽  
Author(s):  
Claudio Mancilla ◽  
José Ernesto Amorós
Keyword(s):  
Negative Impact ◽  
Positive Impact ◽  
Fear Of Failure ◽  
Content Type ◽  
Reference Models ◽  
Cultural Aspects ◽  
And Gender ◽  
The Individual ◽  
Practical Implications ◽  
Secondary City

Purpose The purpose of this paper is to study the differentiated impact of factors that influence the propensity to entrepreneur in a sample of people in Chile. A distinction is made between individuals that live in primary cities and secondary cities. The differentiating factors are socio‐cultural aspects (reference models – positive examples of entrepreneurs – and perception of social fear of failure) and the gender of the individual. Design/methodology/approach For the research data from the survey used in Chile by the Global Entrepreneurship Monitor for the years 2010 and 2011 were used. A logit model was used to determine the differentiated impact of the analysed factors and interactions were done using the method proposed by Corneliâen and Sonderhof (2009). Findings These showed that the fact that an individual lives in a secondary city decreases his entrepreneurship probability. The positive impact that the reference models have is weaker in women. Contrary to what was expected, the negative impact of the fear of failure perception is weaker in women. Practical implications These results have the implications to suggest focused public policies and differentiations that consider the socio‐cultural, territorial (focused in cities) and gender aspects. Originality/value The research contributes by giving empirical evidence of the existence of the negative impact of living in a secondary city and of differentiated effects of socio‐cultural factors from the gender perspective.

Digital competences of the workforce – a research topic?

2017 ◽  
Vol 23 (3) ◽  
pp. 721-734 ◽  
Author(s):  
Matthias Murawski ◽  
Markus Bick
Keyword(s):  
Research Topic ◽  
Future Research ◽  
Digital Competence ◽  
Content Type ◽  
Research Activities ◽  
Starting Point ◽  
Pros And Cons ◽  
Definition Of ◽  
The Individual ◽  
Practical Implications

Purpose Considering working in the digital age, questions on the consequences for the individual workers are, so far, often neglected. The purpose of this paper is to deal with the question of whether the digital competences of the workforce is a research topic. The authors argue for the thesis that it is indeed a research topic. Design/methodology/approach In addition to a literature analysis of the top IS, HR, and learning publications, non-scientific sources, as well as the opinions of the authors, are included. The authors’ thesis is challenged through a debate of corresponding pros and cons. Findings The definition of digital competences lacks scientific depth. Focussing on the workforce is valid, as a “lifelong” perspective is not mandatory for research. Digital competence research is a multidisciplinary task to which the IS field can make a valuable contribution. Research limitations/implications Although relevant references are included, some aspects are mainly driven by the opinions of the authors. The theoretical implications encompass a call for a scientific definition of digital competences. Furthermore, scholars should focus on the competences of the workforce, including occupations, roles, or industries. The authors conclude by providing a first proposal of a research agenda. Practical implications The practical implications include the alignment of multiple stakeholders for the design of “digital” curricula and the integration by HR departments of the construct of digital competences, e.g. for compensation matters and job requirements. Originality/value This paper is one of very few contributions in the area of the digital competences of the workforce, and it presents a starting point for future research activities.

scholarly journals Numerical simulation of flapping airfoil with alula

2020 ◽  
Vol 12 ◽  
pp. 175682932097798
Author(s):  
Han Bao ◽  
Wenqing Yang ◽  
Dongfu Ma ◽  
Wenping Song ◽  
Bifeng Song
Keyword(s):  
Aerodynamic Force ◽  
Angle Of Attack ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Geometric Parameters ◽  
Flight Performance ◽  
Relative Angle ◽  
Vertical Distance ◽  
Unsteady Effect ◽  
Flapping Airfoil

Bionic micro aerial vehicles have become popular because of their high thrust efficiency and deceptive appearances. Leading edge or trailing edge devices (such as slots or flaps) are often used to improve the flight performance. Birds in nature also have leading-edge devices, known as the alula that can improve their flight performance at large angles of attack. In the present study, the aerodynamic performance of a flapping airfoil with alula is numerically simulated to illustrate the effects of different alula geometric parameters. Different alula relative angles of attack β (the angle between the chord line of the alula and that of the main airfoil) and vertical distances h between the alula and the main airfoil are simulated at pre-stall and post-stall conditions. Results show that at pre-stall condition, the lift increases with the relative angle of attack and the vertical distance, but the aerodynamic performance is degraded in the presence of alula compared with no alula, whereas at post-stall condition, the alula greatly enhances the lift. However, there seems to be an optimal relative angle of attack for the maximum lift enhancement at a fixed vertical distance considering the unsteady effect, which may indicate birds can adjust the alula twisting at different spanwise positions to achieve the best flight performance. Different alula geometric parameters may affect the aerodynamic force by modifying the pressure distribution along the airfoil. The results are instructive for design of flapping-wing bionic unmanned air vehicles.

Are the saving decision patterns of bank customers also clouded by psychological biases? Evidence from Ghana

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Joseph Emmanuel Tetteh ◽  
Christopher Boachie
Keyword(s):  
Decision Making ◽  
Loss Aversion ◽  
Design Methodology ◽  
Weighted Least Squares ◽  
Least Squares Regression ◽  
Individual Decision ◽  
Content Type ◽  
Saving Decisions ◽  
The Individual ◽  
Practical Implications

PurposeThis paper attempts to investigate the influence of psychological biases on saving decision-making of bank customers in Ghana.Design/methodology/approachIt employs weighted least squares regression to test the effect of psychological biases on savings decisions of bank customers.FindingsThe findings show that all the nine psychological biases, namely mental accounting, availability, loss aversion, representativeness, anchoring, overconfidence, status quo, framing effect and disposition effect employed for the study have a significant influence on saving decision of bank customers. The results depict that psychological biases are entrenched in the saving pattern of bank customers in Ghana.Practical implicationsFor policy purposes, the study recommends that bank customers need to enhance their knowledge of psychological biases in order to improve their gains from savings, and not to fall prey to these prejudices. The satisfied customer is a dependable source of bank viability and survival.Originality/valueTo the best of the knowledge of the author, this study provides the first empirical evidence of the influence of psychological biases on saving decisions of bank customers in Ghana. The findings of this study will enhance knowledge on the influence of psychological biases on individual decision-making and will accentuate the fact that the individual is not an entirely rational being.

The development of innovations in organizations: the role of creative energy fields

Kybernetes ◽  
2015 ◽  
Vol 44 (1) ◽  
pp. 89-106 ◽  
Author(s):  
Jon-Arild Johannessen ◽  
Hugo Skaalsvik
Keyword(s):  
Global Economy ◽  
Content Type ◽  
Energy Field ◽  
Innovation Research ◽  
Individual Enterprise ◽  
New Ideas ◽  
Enterprise Level ◽  
And Performance ◽  
The Individual ◽  
Practical Implications

Purpose – One problem that many organisations face today in the global economy is that too few ideas are turned into innovations. The purpose of this paper is to show how innovations in organisations may be obtained by means of creative energy fields. Design/methodology/approach – The design employed in the research represents a holistic, change oriented approach to innovation, and the methodology is conceptual where an analytical model is used. Findings – The paper provides arguments that organisations need to develop creative energy fields in order to enhance their innovative capacity and performance. In the paper the construct creative energy field is conceptualised as “a spot in an organisation where a Group of creative individuals collaborate and work together in order to bring to surface new ideas which may fuel innovation processes and Development in organisations”. The paper shows that creative energy fields are influenced by five distinct components; those of making a clear purpose, planning after the results have become apparant, an organisation’s rule breakers, drawing a map that changes the landscape, and igniting the flame of innovation. Furthermore, the findings encompass three conditions which need to be present in an organisation in order to make creative energy fields work. Research limitations/implications – The carried out focuses on the individual organisation which aims to enhance innovation performance. Practical implications – In relation to practical implications, the paper shows, in particular, how an organisation may move into areas of innovation by means of a Lego system of organising. Originality/value – To the authors’ knowledge, the creation and use of a novel construct, that of creative energy fields, represents newness and originality in innovation research at the level of the individual enterprise. Furthermore, the paper contributes to the extant management knowledge of innovation by showing how a Lego system of organising may foster innovation at the enterprise level.

Frameworks for consumers’ narratives in a changing marketplace

2017 ◽  
Vol 35 (7) ◽  
pp. 892-906
Author(s):  
David A. Gilliam ◽  
Teresa Preston ◽  
John R. Hall
Keyword(s):  
Design Methodology ◽  
Ground Level ◽  
Retail Banking ◽  
Content Type ◽  
Cultural Narrative ◽  
Banking Activity ◽  
Consumer Surveys ◽  
The Individual ◽  
The Impact ◽  
Practical Implications

Purpose Narratives are central to consumers’ understanding of brands especially during change. The financial crisis that began in 2008 offered a changing marketplace from which to develop two managerially useful frameworks of consumer narratives. The paper aims to discuss these issues. Design/methodology/approach Consumer focus groups, interviews with bankers and qualitative consumer surveys were used to gather consumers’ narratives about retail banking. The narratives were examined through frameworks from both the humanities and psychology (narrative identity). Findings The individual consumer narratives were used to create first a possible cultural narrative or bird’s eye view and later archetypal narratives of groups of consumers for a ground-level view of the changing marketplace. Research limitations/implications Like all early research, the findings must be examined in other contexts to improve generalizability. Practical implications The narrative results revealed the impact of change on consumers’ identities, views of other entities and retail banking activity to yield managerially actionable information for segmentation, target marketing, branding and communication. Originality/value Frameworks are developed for consumer narratives which are shown to be useful tools in examining consumers’ reactions to changing markets and in formulating marketing responses.

Leadership development strategy: the missing links

2018 ◽  
Vol 32 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Shilpa Kabra Maheshwari ◽  
Jaya Yadav
Keyword(s):  
Leadership Development ◽  
Development Strategy ◽  
Scale Up ◽  
Competitive Growth ◽  
Development Programs ◽  
Leadership Development Programs ◽  
Content Type ◽  
The Individual ◽  
Business Complexity ◽  
Practical Implications

Purpose Current volatile environments, business complexity, and leadership gaps are compelling organizations to deploy effective leadership development strategies. Fueled by competitive growth and people challenges, efforts continue to scale up but fail to create the desired leaders. This paper aims to address the missing links and calls for new ways of deploying leadership development strategy. Design/methodology/approach Qualitative data on experiential feedback have been collected from participants and stakeholders of leadership development programs in Indian organizations. Findings An integrated six-step approach to leadership development has been proposed for scholars and practitioners. Practical implications From the practitioner’s perspective, this study contributes to the field of leadership development by challenging the relevance of current approaches. It also adds to the scholarly literature on leadership development in the context of the organization and the individual. Originality/value Current studies in the area of leadership development in the Indian context are scarce.

Going above and beyond

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Keyword(s):  
Organizational Citizenship ◽  
Global Scale ◽  
Citizenship Behaviors ◽  
Content Type ◽  
Pertinent Information ◽  
The Individual ◽  
Person Organization Fit ◽  
Good Congruence ◽  
Practical Implications ◽  
Role Behaviors

Purpose This paper aims to review the latest management developments across the globe and pinpoint practical implications from cutting-edge research and case studies. Design/methodology/approach This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context. Findings For organizational success on a global scale, companies are looking for employees who will perform above and beyond the job description. These extra-role behaviors benefit both the individual and the organization. Good strategic human resource practices (SHRPs) such as reward management (RM) and employee development (ED) can increase the potential for employees performing such organizational citizenship behaviors (OCBs). Employees who have emotional exhaustion (EE) are likely to demonstrate reduced extra-role behaviors. Managers need to ensure there are good SHRPs in place and that employee EE is reduced. Good congruence (Person-Organization fit) is beneficial for increasing OCB. Originality/value The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy-to-digest format.

Cultural traits influencing the adoption of new ways of workings

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Amitesh Singh Parihar ◽  
Vinita Sinha
Keyword(s):  
Design Methodology ◽  
Driving Forces ◽  
Manufacturing Industries ◽  
Survey Questionnaire ◽  
Content Type ◽  
New Ways Of Working ◽  
One Step ◽  
Cultural Traits ◽  
The Individual ◽  
Practical Implications

Purpose The purpose of this paper is to identify the strengths and areas of improvement for taking organizations one step ahead in terms of adopting digitalization, analytics and governance. Also, the paper aims to identify the organizational cultural traits that influence the adoption of digitization and technology, analytics and governance. Design/methodology/approach A quantitative analysis of survey questionnaire collected from working professionals of various manufacturing industries to find out the driving traits and the restraining traits and to propose which is dominating. Sector: manufacturing, sample: working professionals across functions and sample size: 80–100 people. Findings This research suggests the cultural traits that influence the adoption of digitization and technology, analytics and governance in any organization. Practical implications As organizations explore new ways of working, their organizational culture and employee perspective would play an important role in prioritizing the interventions. This research aims to suggest a strategy to strengthen the driving forces and/or weaken the restraining forces. Originality/value There are various papers available on the individual topics but the uniqueness of this paper is that it represents all three factors in a single research and their influencers.

Learning organization – organization emerging from presence

2019 ◽  
Vol 27 (1) ◽  
pp. 17-30
Author(s):  
Nataša Rupčić
Keyword(s):  
Learning Organization ◽  
Critical Review ◽  
Paradigm Shift ◽  
Design Methodology ◽  
Social Problems ◽  
Wicked Problems ◽  
Social Dimensions ◽  
Content Type ◽  
The Individual ◽  
Practical Implications

Purpose The purpose of this paper is to discuss the possibilities of transcending individual, organizational and social problems through the prism of presence as suggested by Senge et al. (2012). Design/methodology/approach The paper is based on the critical review of previous contributions. Findings The idea of a learning organization seems romantic and elusive, as well as difficult to implement, especially when the definition by Senge (1990) is considered. At the same time, organizational and social complexity is increasing and resulting in numerous difficult or wicked problems. To reach integrative and transcending solutions, a change in perception and surrender to presence is key. Research limitations/implications Conclusions provided in the paper could benefit from further practice to corroborate the findings. Practical implications Suggestions for practitioners have been provided on how to solve personal, organizational and social problems on the basis of the paradigm shift and the shift in perception. Originality/value In this paper, the individual, organizational and social dimensions in terms of their intricacies are considered and solutions are offered that could simultaneously solve wicked problems on all three levels.

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