Kartik Venkatraman, Stéphane Moreau, Julien Christophe and Christophe Schram
The purpose of the paper is to predict the aerodynamic performance of a complete scale model H-Darrieus vertical axis wind turbine (VAWT) with end plates at different operating…
Abstract
Purpose
The purpose of the paper is to predict the aerodynamic performance of a complete scale model H-Darrieus vertical axis wind turbine (VAWT) with end plates at different operating conditions. This paper aims at understanding the flow physics around a model VAWT for three different tip speed ratios corresponding to three different flow regimes.
Design/methodology/approach
This study achieves a first three-dimensional hybrid lattice Boltzmann method/very large eddy simulation (LBM-VLES) model for a complete scaled model VAWT with end plates and mast using the solver PowerFLOW. The power curve predicted from the numerical simulations is compared with the experimental data collected at Erlangen University. This study highlights the complexity of the turbulent flow features that are seen at three different operational regimes of the turbine using instantaneous flow structures, mean velocity, pressure iso-contours, blade loading and skin friction plots.
Findings
The power curve predicted using the LBM-VLES approach and setup provides a good overall match with the experimental power curve, with the peak and drop after the operational point being captured. Variable turbulent flow structures are seen over the azimuthal revolution that depends on the tip speed ratio (TSR). Significant dynamic stall structures are seen in the upwind phase and at the end of the downwind phase of rotation in the deep stall regime. Strong blade wake interactions and turbulent flow structures are seen inside the rotor at higher TSRs.
Research limitations/implications
The computational cost and time for such high-fidelity simulations using the LBM-VLES remains expensive. Each simulation requires around a week using supercomputing facilities. Further studies need to be performed to improve analytical VAWT models using inputs/calibration from high fidelity simulation databases. As a future work, the impact of turbulent and nonuniform inflow conditions that are more representative of a typical urban environment also needs to be investigated.
Practical implications
The LBM methodology is shown to be a reliable approach for VAWT power prediction. Dynamic stall and blade wake interactions reduce the aerodynamic performance of a VAWT. An ideal operation close to the peak of the power curve should be favored based on the local wind resource, as this point exhibits a smoother variation of forces improving operational performance. The 3D flow features also exhibit a significant wake asymmetry that could impact the optimal layout of VAWT clusters to increase their power density. The present work also highlights the importance of 3D simulations of the complete model including the support structures such as end plates and mast.
Social implications
Accurate predictions of power performance for Darrieus VAWTs could help in better siting of wind turbines thus improving return of investment and reducing levelized cost of energy. It could promote the development of onsite electricity generation, especially for industrial sites/urban areas and renew interest for VAWT wind farms.
Originality/value
A first high-fidelity simulation of a complete VAWT with end plates and supporting structures has been performed using the LBM approach and compared with experimental data. The 3D flow physics has been analyzed at different operating regimes of the turbine. These physical insights and prediction capabilities of this approach could be useful for commercial VAWT manufacturers.
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Cédric Baudrit, Christophe Fernandez, Julien Couteaux, Patrice Buche, Nadege Bel, Cecile Charles and Eric Notz
This paper aims to address the challenges faced by the cheese industry, particularly concerning the preservation and transfer of traditional cheesemaking knowledge. It emphasises…
Abstract
Purpose
This paper aims to address the challenges faced by the cheese industry, particularly concerning the preservation and transfer of traditional cheesemaking knowledge. It emphasises the need for innovative solutions in sustainably managing knowledge and skills amidst changing demographic and technological landscapes.
Design/methodology/approach
Our approach consists of developing and implementing a digital tool, the cheese eK-Book, which is designed to capture, structure and disseminate cheesemaking knowledge. This tool is based on a semantic network and is accessible via smartphones and tablets and aims to facilitate continuous learning, knowledge transfer and collaboration across diverse stakeholders in the cheese production sector.
Findings
The study highlights several critical findings. Traditional cheesemaking knowledge is currently at risk due to a number of factors, including the ageing of skilled workers, a lack of succession planning and pressures from globalisation and industrialisation. The European dairy sector is evolving towards more specialised and automated production, requiring a skilled workforce capable of adapting to these changes. There is a significant gap between traditional cheese makers and research institutions, hindering the adoption of new technologies and best practices. The cheese eK-Book offers a promising solution to these challenges by preserving knowledge, supporting continuous learning and enhancing collaboration between industry stakeholders and educational/research institutions. The tool facilitates access to scientific knowledge, promotes work–life balance by offering a range of flexible learning opportunities and supports tailored training programmes based on individual users’ needs.
Originality/value
This article contributes original insights by proposing a comprehensive digital solution tailored to the specific, current needs of the cheese industry. By integrating modern technology with traditional knowledge, the cheese eK-Book not only preserves expertise but also fosters innovation and sustainability within the sector. It bridges the gap between practical cheesemaking skills and contemporary scientific understanding, addressing critical challenges such as knowledge retention, succession planning and workforce development in a rapidly evolving industry landscape. The strength of the Cheese eK-Book lies in its capacity to communicate knowledge, traditions and teachings across generations. This transfer of knowledge and skills plays a crucial role in preserving heritage and fostering connections across different generations within a community.
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Over those two months, he had to untangle a complex political puzzle to construct a team that would not only be acceptable to the 24 different parties within President Felix…
Details
DOI: 10.1108/OXAN-DB261049
ISSN: 2633-304X
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Topical
John F. Tanner, Christophe Fournier, Jorge A. Wise, Sandrine Hollet and Juliet Poujol
This paper aims to present perceptions of sales executives from three countries regarding expectations for the future of the sales profession and sales position.
Abstract
Purpose
This paper aims to present perceptions of sales executives from three countries regarding expectations for the future of the sales profession and sales position.
Design/methodology/approach
Results of a thematic interpretation of in‐depth interviews are presented, using several agenda‐setting articles as a foundation.
Findings
Executives struggle with how salespeople should add value, especially in today's multi‐channel environment. Greater professionalization is needed in countries where the state of the profession is less developed. Emergent strategy is practiced but not universally. Sales executives generally believe that little incremental value in technology can be gained, though it is apparent that technology is not being fully utilized. Other findings are also discussed.
Research limitations/implications
Researchers should consider classifying sales research by sales strategy rather than industry or country unless those aspects are factors being studied; further, questions such as how do salespeople create value and when is human intervention in the sales process required are offered.
Practical implications
Executives should re‐examine sales technology, particularly in managing and transferring knowledge. Emergent strategy requires processes for identifying and transferring effective adaptation. Sales organizations must develop, at the salesperson level, greater business acumen, to be gained through training, experience or selection.
Originality/value
This study identifies issues and factors that will influence sales practice and should influence sales research into the future. Particularly, the study is the first to highlight the use of emergent strategy, as well as the issue of identifying and creating value.
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Joanne Jojczyk, Francois Lambotte and Christel Christophe
This article explores the interpretive process of ethnographic research within the framework of Communicative Constitution of Organization (CCO) approaches. Specifically, it…
Abstract
Purpose
This article explores the interpretive process of ethnographic research within the framework of Communicative Constitution of Organization (CCO) approaches. Specifically, it examines the role of Ricoeur’s triple mimesis as a hermeneutic tool in making sense of the extensive data gathered during a three-year ethnographic study of a cultural event, “Le Grand Huit,” part of the Mons 2015 European Capital of Culture initiative.
Design/methodology/approach
The research employs a filmed ethnographic methodology to capture the participatory processes of the “Le Grand Huit” project. The study is guided by CCO principles, focusing on communication events as the central unit of analysis. The interpretive framework of Ricoeur’s triple mimesis is utilized to navigate and textualize the complex data collected, including fieldnotes, interviews and video footage.
Findings
The study demonstrates how the process of textualizing ethnographic data through Ricoeur’s triple mimesis – prefiguration, configuration and refiguration – unpacks the interpretative process of CCO ethnographers. The narrative construction not only aids in data interpretation but also establishes the authority of the ethnographic account by making the researcher’s biases and preunderstandings explicit.
Originality/value
This article contributes to CCO scholarship by providing a methodological tool that integrates hermeneutic phenomenology into ethnographic research. It addresses the often-criticized vagueness of ethnographic methods and emphasizes the importance of reflexivity in legitimizing scientific knowledge. The application of Ricoeur’s triple mimesis offers a novel approach to understanding the constitutive role of communication in organizing processes.
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Abstract
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Rodolphe Durand, Berangere Szostak, Julien Jourdan and Patricia H. Thornton
We propose that institutional logics are resources organizations use to leverage their strategic choices. We argue that firms with an awareness of multiple available logics…
Abstract
We propose that institutional logics are resources organizations use to leverage their strategic choices. We argue that firms with an awareness of multiple available logics, expressed by a larger stock of competences and a broader industrial scope are more likely to add an institutional logic to their repertoire and to become purist in this new logic. We also hypothesize that a favorable opportunity set as expressed by status leads high and low status firms to add a logic but not to focus exclusively on this new logic. We examine our hypotheses in the French industrial design industry from 1989 to 2003 in which a managerialist logic emerged and prevailed along with the pre-existing institutional logics of modernism and formalism. Our findings contribute to theory on the relationship between organizations’ strategy and institutional change and partially address the paradox of why high-status actors play a key role in triggering institutional change when such change is likely to undermine the very basis of their social position and advantage.