Reynolds-averaged Navier–Stokes (RANS) models often perform poorly in shock/turbulence interaction regions, resulting in excessive wall heat load and incorrect representation of…
Abstract
Purpose
Reynolds-averaged Navier–Stokes (RANS) models often perform poorly in shock/turbulence interaction regions, resulting in excessive wall heat load and incorrect representation of the separation length in shockwave/turbulent boundary layer interactions. The authors suggest that this can be traced back to inadequate numerical treatment of the inviscid fluxes. The purpose of this study is an extension to the well-known Harten, Lax, van Leer, Einfeldt (HLLE) Riemann solver to overcome this issue.
Design/methodology/approach
It explicitly takes into account the broadening of waves due to the averaging procedure, which adds numerical dissipation and reduces excessive turbulence production across shocks. The scheme is derived based on the HLLE equations, and it is tested against three numerical experiments.
Findings
Sod’s shock tube case shows that the scheme succeeds in reducing turbulence amplification across shocks. A shock-free turbulent flat plate boundary layer indicates that smooth flow at moderate turbulence intensity is largely unaffected by the scheme. A shock/turbulent boundary layer interaction case with higher turbulence intensity shows that the added numerical dissipation can, however, impair the wall heat flux distribution.
Originality/value
The proposed scheme is motivated by implicit large eddy simulations that use numerical dissipation as subgrid-scale model. Introducing physical aspects of turbulence into the numerical treatment for RANS simulations is a novel approach.
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Daniel Klatt, Alina Mielke and Christian Mundt
Spinning slender bodies are affected by lateral Magnus forces and moments when exposed to cross-flow. The effects occurring for spinning bodies of revolution in combination with…
Abstract
Purpose
Spinning slender bodies are affected by lateral Magnus forces and moments when exposed to cross-flow. The effects occurring for spinning bodies of revolution in combination with stabilising or control surfaces such as canards are not yet fully explained. Therefore the present work aims to investigate the phenomena arising from the interactions of a roll-decoupled guidance unit with a spinning rear body are investigated.
Design/methodology/approach
A generic tangential-ogive-cylinder projectile equipped with deflectable canards on a roll-decoupled nose is investigated by means of 3D Reynolds-averaged Navier–Stokes simulations at Mach number 2 for angles of attack up to 22 degrees. Different canard deflection angles up to 9 degrees are considered. Global aerodynamic coefficients as well as local flow fields are analysed to explain the interactions occurring between the roll-decoupled guidance unit and the spinning rear body.
Findings
The deflected canards lead to flow interactions resulting in lateral forces and moments even without a spinning motion of the rear part. Depending on the canard deflection angles, these forces act in or against the direction of the classical Magnus effect. For angles of attack smaller than 10 degrees it is possible for the current body geometry to directly superpose the lateral effects resulting from the fins for the non-spinning model with those occurring for the non-finned but spinning model to obtain the total forces and moments acting on a spinning model with canted canards. However, the lateral effects generated on the guidance unit itself are insignificant compared to the canard-induced effects on the rear body.
Originality/value
A detailed analysis of the interaction effects arising from a decoupled guidance unit containing canards with a non-spinning/spinning rear body is performed and the underlying phenomena are revealed.
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The purpose of this paper is to identify young cultural visitors’ perceptions towards culture and cultural heritage destinations.
Abstract
Purpose
The purpose of this paper is to identify young cultural visitors’ perceptions towards culture and cultural heritage destinations.
Design/methodology/approach
This study, based on a survey conducted in the archaeological site of Delphi in Greece, examines young cultural visitors’ perceptions by identifying their perceived importance for a series of destination attributes.
Findings
Findings reveal the important characteristics of cultural heritage sites for young travelers. Emphasis needs to be given on the following four influential factors of a cultural heritage site: organization and facilities, learning and experience, operation and accessibility, and place and promotion.
Research limitations/implications
Tourism authorities ought to focus upon young people and understand their needs in order to attract them to cultural destinations providing positive experience/s. This study is a unique attempt to analyze the perceptions of young people in cultural destinations and is limited to only one cultural heritage site, Delphi. Further, research in other sites examining younger ages and their differences would provide significant information about this unexplored market in cultural sites.
Originality/value
This paper examines that misconception about culture concerning only older age‐groups needs a new way of thinking that takes into consideration young visitors as important cultural visitors. By ignoring their importance, opportunities to maximize value from the sites as well as to operate them in a more sustainable manner are lost. Knowing exactly the perceptions of young people for culture gives insights into their present and future behavior in cultural heritage destinations.
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ALMOST TWO YEARS AGO we acquired Grafton & Co. and THE LIBRARY WORLD. For me it has been an interesting experience to be involved in the production of a magazine, and it has been…
Abstract
ALMOST TWO YEARS AGO we acquired Grafton & Co. and THE LIBRARY WORLD. For me it has been an interesting experience to be involved in the production of a magazine, and it has been gratifying to carry on the tradition of such a respected and long established journal.
The aim of this paper is to introduce the topic of poster presentation as legitimate area of academic study and practice within the marketing discipline.
Abstract
Purpose
The aim of this paper is to introduce the topic of poster presentation as legitimate area of academic study and practice within the marketing discipline.
Design/methodology/approach
The paper presents the output of one part of a research project that reviewed the state of knowledge and practice within poster presentation as a dissemination medium for research information. The results of the literature search are presented as an annotated bibliography.
Findings
The literature search reveals a sizeable body of material on the use of poster presentation as a dissemination media, indicative of a set of key themes that guide good practice in poster design, construction and presentation. It also includes material that has studied the use of poster design and presentation exercises as pedagogical devices.
Research limitations/implications
The research on which the paper is based is limited by virtue of not offering a more complete survey of contemporary poster presentation practice across the sciences. It draws observations from the author's attendance at several marketing and management‐related conferences where poster presenters have been interviewed and examples of poster presentation have been collected. However, in the sciences, especially the medical sciences, poster practice is well‐established and in some cases moving towards digitisation.
Practical implications
The aesthetics of poster design remain unclear in the case of poster design for the dissemination of scientific information. However, a set of templates has been produced based on the close study of a database of over 600 poster designs and ten years' experience of using posters as teaching tools for research training. A methodology for poster design has also been developed known as “The Block Architecture Method of Poster Design”. It uses the software Powerpoint and Photoshop to develop poster design electronically.
Originality/value
The bibliography will help interested teachers and students explore the various issues surrounding poster design, construction and presentation. It will also help to understand some of the advantages of using poster‐design exercises as creative and critical devices in a pedagogical context.
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This paper aims to examine market-mediated transformative capacities of Black African Pentecostalism. It does this by exploring the interface between religion, culture and…
Abstract
Purpose
This paper aims to examine market-mediated transformative capacities of Black African Pentecostalism. It does this by exploring the interface between religion, culture and identity to generate a fresh interpretation of how marketing is ritualized among UK’s Black Africans on the platform of Pentecostalism.
Design/methodology/approach
Methodology is based on in-depth interviews with respondents drawn from the African Pentecostal movements in London, UK. This paper shows how adherents’ responsiveness to Pentecostal dogmas generated market advantages.
Findings
The paper reveals the interconnectedness of religion, faith and culture which, in turn, coalesced into a dense network that defines the reproduction, organization and approach to entrepreneurial marketing.
Originality/value
Pentecostal practices unveil the marketing notion of “Pentepreneurship”, which combines both spiritual and enterprise activities to formulate a fused space of engagement straddling the sacred and the secular. This fusion points to a unique platform of entrepreneurial marketing that bestrides ethno-cultural, religious and economic identities.
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At many crucial moments in recent foreign affairs, relations between the United States and other nations of the world have hinged on our diplomats providing accurate and timely…
Abstract
At many crucial moments in recent foreign affairs, relations between the United States and other nations of the world have hinged on our diplomats providing accurate and timely information to governments and foreign publics about our government's policies and our goals (Dunlop, 1996). Within the US government, our relations with other peoples of the world was coined as public diplomacy, as opposed to official diplomacy between governments, by the Kennedy administration. Despite strains in US relations with other countries, international opinion polls mostly show that Americans are still admired, even as there are disagreements with US policies (Pew Research Center for People and the Press, 2003; What the World Thinks, 2004).
Zeliha Özlü-Erkilic, Dietmar Winkler, Christian Popow, Heidi Elisabeth Zesch and Türkan AKKAYA-KALAYCI
The migration background can influence the life satisfaction of migrants. The purpose of this paper is to examine the life satisfaction of migrants and particularly the…
Abstract
Purpose
The migration background can influence the life satisfaction of migrants. The purpose of this paper is to examine the life satisfaction of migrants and particularly the satisfaction regarding their health in comparison to natives.
Design/methodology/approach
The life satisfaction of 50 Turkish-speaking migrants living in Vienna was compared with the life satisfaction of 50 native Austrians by the questionnaire of life satisfaction by Fahrenberg et al. (2000).
Findings
Turkish-speaking migrants had lower values than natives in all scales of the questionnaire concerning life satisfaction. Turkish-speaking women reported the lowest satisfaction regarding their health state. In the migrant group the satisfaction regarding health decreased with increasing age.
Research limitations/implications
The Turkish version of the questionnaire was translated into Turkish by authors but not formally validated. Furthermore acculturation strategies as well as the mental and physical health state of the participant, which can crucially influence the life satisfaction of migrants, were not surveyed.
Practical implications
Migrants have lower life satisfaction possibly because of their physical and mental health problems. Therefore in countries with a high proportion of migrants the health-care system should be adapted for the needs of migrants, especially for the needs of women and older migrants in order to increase the utilization of the health-care services, primarily the use of the preventive health-care services.
Social implications
The results of the present study can be helpful to develop strategies for improving the life satisfaction of migrants, especially the satisfaction regarding their health.
Originality/value
To the authors’ knowledge, the present study is the first research project in Vienna conducted to estimate the impact of migration background on life satisfaction.