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1 – 10 of over 10000
Article
Publication date: 7 March 2016

WenRuo Zhu, ZhongXin Gao, YongJun Tang, JianGuang Zhang and Li Lu

The purpose of this paper is to analyze the ability of turbulence models to model the flow field in the runner of a Francis turbine. Although the complex flow in the turbine can…

Abstract

Purpose

The purpose of this paper is to analyze the ability of turbulence models to model the flow field in the runner of a Francis turbine. Although the complex flow in the turbine can be simulated by CFD models, the prediction accuracy still needs to be improved. The choice of the turbulence model is one key tool that affects the prediction accuracy of numerical simulations.

Design/methodology/approach

This study used the SST k-w and RNG k-e turbulence models, which can both accurately predict complex flow fields in numerical simulations, to simulate the flow in the entire flow passage of a Francis turbine with the results compared against experimental data for the performance and blade pressure distribution in the turbine to evaluate the applicability of the turbulence models.

Findings

The results show that the SST k-w turbulence model more accurately predicts the turbine performance than the RNG turbulence model. However, the blade surface pressures predicted by the SST k-w turbulence model were basically identical to those predicted by the RNG k-e turbulence model, with both accurately predicting the experimental data.

Research limitations/implications

Due to the lack of space, the method used to measure the blade surface pressure distributions is not introduced in this paper.

Practical implications

Turbine performance and flow field pressure in the runner, which are the basis of turbine preliminary performance judgment and optimization through CFD, can be used to judge the rationality of the turbine runner design. The paper provides an evidence for the turbulence selection in numerical simulation to predict turbine performance and flow field pressure in the runner and improves the CFD prediction accuracy.

Originality/value

This paper fulfils a test of the flow field pressure in the runner, which provide an evidence for judge the adaptability of turbulence model on the flow field in runner. And this paper also provides important evaluations of two turbulence models for modeling the flow field pressure distribution in the runner of a Francis turbine to improve the accuracy of CFD models for predicting turbine performance.

Details

Engineering Computations, vol. 33 no. 1
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 24 November 2023

Kim Man Erica Lee, Yanto Chandra and Ho Lee

The social venture (SV) is an increasingly popular form of organization to pursue social goals using a commercial approach. Although marketing plays an important role in SV…

Abstract

Purpose

The social venture (SV) is an increasingly popular form of organization to pursue social goals using a commercial approach. Although marketing plays an important role in SV research and a key driver of the performance of SVs, how and the extent to which market conditions play a role remains understudied. This study examines if market turbulence can moderate marketing capabilities and performance relationships.

Design/methodology/approach

The authors developed several hypotheses rooted in the marketing literature and tested them using data collected from a sample of 109 SVs from East Asia (i.e. Hong Kong and Taiwan). Using multiple regression analysis and structural equation modeling, the authors analyzed the marketing capabilities and financial and social performance relationships and the positive moderating role of market turbulence.

Findings

The results suggested that market turbulence is a positive moderator which influences the effect of the marketing capabilities–financial performance relationship, but not the marketing capabilities and social performance relationship.

Originality/value

This paper attempts to interrogate the SV's marketing capabilities–performance relationship in the East Asian context and how market turbulence may enhance or weaken the relationship. This is one of the earliest papers in this research area. The key findings from this research offer valuable theoretical contribution to the study of SV performance.

Details

Journal of Small Business and Enterprise Development, vol. 31 no. 2
Type: Research Article
ISSN: 1462-6004

Keywords

Article
Publication date: 20 October 2022

Joe Hazzam, Stephen Wilkins and Carolyn Strong

The study examines the role of social media technologies (SMTs) as a driver of organization cultural intelligence (OCI) and new product development (NPD) capabilities, and how the…

Abstract

Purpose

The study examines the role of social media technologies (SMTs) as a driver of organization cultural intelligence (OCI) and new product development (NPD) capabilities, and how the complementary effects of these capabilities contribute to multinational corporations (MNCs)’ performance. Further, the study investigates the capability–performance relationship under conditions of high and low market and technological turbulence.

Design/methodology/approach

A quantitative survey method was implemented, with the data provided by senior marketing managers employed in MNC regional offices. The proposed model was tested using structural equation modeling and multi-group moderation analysis, and fuzzy-set qualitative comparative analysis (fsQCA).

Findings

The results indicate that SMTs support the development of OCI and NPD capabilities, which in turn contribute to MNC regional performance. A high level of technological turbulence only weakens the relationship between OCI and performance.

Research limitations/implications

The results suggest that OCI contributes to MNCs’ performance, by deploying social media information and complementing the organization’s NPD capability under a specific environmental context.

Practical implications

The paper offers practical recommendations to MNCs on social media use when developing and launching new products in different regional markets. MNCs need to recruit culturally intelligent managers, who consider the level of market and technological turbulence when combining several types of capabilities.

Originality/value

Within the dynamic marketing capabilities literature, this is the first study to incorporate and reliably measure cultural intelligence capability. The research offers empirical evidence that OCI and NPD capabilities are necessary to achieve superior MNC performance and depend on the level of market and technological turbulence.

Open Access
Article
Publication date: 9 January 2023

Anni Rajala and Tuire Hautala-Kankaanpää

Small- and medium-sized enterprises (SMEs) often operate in environments marked by high levels of turbulence. Such firms adopt digital technologies and platforms that provide…

3406

Abstract

Purpose

Small- and medium-sized enterprises (SMEs) often operate in environments marked by high levels of turbulence. Such firms adopt digital technologies and platforms that provide access to external real-time information and establish digital connectivity between firms to remain competitive. This study aims to focus on SMEs’ downstream and upstream platform-based digital connectivity (PDC).

Design/methodology/approach

This study examines the effects of PDC on SMEs’ operational performance under conditions of environmental turbulence. The data was gathered from 192 SMEs operating in the manufacturing arena.

Findings

The results show that the adoption of PDC does not directly affect an SME’s operational performance. However, in highly turbulent environments, PDC can improve operational performance. The results indicate that the performance effects of PDC vary according to the level and type of environmental turbulence.

Research limitations/implications

This research offers insights into the relationship between PDC among SMEs and operational performance and encourages future research examining other possible conditional effects that could explain the contradictory results found in previous research.

Originality/value

This study contributes to the knowledge of supply-chain digitalization among SMEs and its performance effects in varying environmental conditions. Further, this study contributes to the prior research by focusing on the interorganizational aspects of digitalization in SMEs.

Details

Journal of Business & Industrial Marketing, vol. 38 no. 13
Type: Research Article
ISSN: 0885-8624

Keywords

Article
Publication date: 5 December 2022

Xiaohong Xiao, Chengxu Zhou and Hongyi Mao

This study aims to investigate the impact of the two essential subjects of servitization (service and goods innovation) on customer satisfaction. The authors explained the paradox…

Abstract

Purpose

This study aims to investigate the impact of the two essential subjects of servitization (service and goods innovation) on customer satisfaction. The authors explained the paradox of servitization by determining how service innovation and goods innovation affect customer satisfaction interacting with environmental turbulence and marketing intensity.

Design/methodology/approach

The authors obtained 376 observations of 84 listed Chinese companies. On the basis of content analysis and measurement from secondhand data, the authors first tested the hypotheses in the fixed-effects model. The authors conducted a split-sample analysis by dividing environmental turbulence into two samples to explain the results effectively and better interpret the relationship between two innovations to customer satisfaction.

Findings

The results show that goods and service innovations positively affect customer satisfaction, but the effect of service innovation is more substantial. Furthermore, environmental turbulence negatively moderates the relationship between service innovation and customer satisfaction. The empirical results indicated that, if enterprises enhance marketing intensity, then the growth of environmental turbulence weakens the positive impact of goods and services innovation on customer satisfaction.

Originality/value

This study provided an understanding of the impact of servitization on intangible assets. This study also responded to previous literature’s call for research on the impact of external environmental factors on servitization.

Details

Journal of Business & Industrial Marketing, vol. 38 no. 10
Type: Research Article
ISSN: 0885-8624

Keywords

Article
Publication date: 14 July 2022

Velmani M. and Suresh V.

This paper aims to numerically investigate the influence of shock wave and freestream turbulence interaction on the parabolic and spherically blunted nose cones at supersonic…

Abstract

Purpose

This paper aims to numerically investigate the influence of shock wave and freestream turbulence interaction on the parabolic and spherically blunted nose cones at supersonic speed.

Design/methodology/approach

Using density-based solver, the three-dimensional steady-state simulation is carried out. The working fluid is calorically perfect that obeys ideal gas law and the no-slip boundary conditionis given to the surface of the nose cone. Pressure far-field boundary condition is imposed at the boundary of the computational domain by giving freestream Mach number, freestream static pressure and temperature.

Findings

The growth rate of the boundary layer is faster on the spherically blunted nose cone, hence, the overall drag force is higher than the parabolic nose cone. Temperature at the edge of the boundary layer is increased due to the early ampli-fication of instabilities by the upstream disturbance. In this sense, the effects of freestream turbulence depend on its level, freestream conditions, strength and type of shock wave and zone of influence.

Research limitations/implications

Simulations are carried out for the flow Mach number 2.0 at zero angles of attack for the freestream conditions of the flow at an altitude of 10,000 m.

Practical implications

The phenomenon of shock wave–turbulence interaction occurs in flow regimes from transonic to hypersonic speeds and finds a wide range of applications, especially in the design of aircraft and missiles configurations.

Originality/value

The phenomenon of compression wave and freestream turbulence interaction around the commonly used nose cones in the case of aircraft, missiles, etc., is investigated. The performance characteristics such as aerodynamic drag, boundary layer dynamics and the nature of flow around the different nose cones at zero angle of attack are illustrated.

Details

Aircraft Engineering and Aerospace Technology, vol. 95 no. 2
Type: Research Article
ISSN: 1748-8842

Keywords

Article
Publication date: 14 June 2022

Ruida Li, Li Zheng and Ling Yuan

External environment drives established enterprises to employ management innovation. Drawing on dual-process theories, this paper purports to investigate TMT's intuitive and…

Abstract

Purpose

External environment drives established enterprises to employ management innovation. Drawing on dual-process theories, this paper purports to investigate TMT's intuitive and rational decision-making styles as mediating roles between perceived environmental turbulences and management innovation, and explain how organizational slack play an critical moderating role.

Design/methodology/approach

SPSS 25 is used to test 120 established enterprises' top management team (TMT) samples in China, and the moderated mediation model is empirically tested by using hierarchical regression analysis and conditional process analysis.

Findings

Perceived environmental turbulences promotes management innovation. Organizational slack as contextual variable influences the relationship between technology turbulence and TMT's decision-making styles. Interestingly, only perceived technology turbulence indirectly affects management innovation through TMT's intuitive decision-making when moderated by organizational slack. However, the indirect effect from perceived market turbulence to management innovation through TMT's rational decision-making is not significant when moderated by organizational slack.

Originality/value

Based on management innovation's human agency perspective, TMT's decision-making styles have not been discussed in research on management innovation. This paper sheds light on TMT's decision-making styles as mediating role.

Details

Journal of Organizational Change Management, vol. 35 no. 7
Type: Research Article
ISSN: 0953-4814

Keywords

Article
Publication date: 16 June 2020

Taurista Perdana Syawitri, Yufeng Yao, Jun Yao and Budi Chandra

The aim of this paper is to assess the ability of a stress-blended eddy simulation (SBES) turbulence model to predict the performance of a three-straight-bladed vertical axis wind…

Abstract

Purpose

The aim of this paper is to assess the ability of a stress-blended eddy simulation (SBES) turbulence model to predict the performance of a three-straight-bladed vertical axis wind turbine (VAWT). The grid sensitivity study is conducted to evaluate the simulation accuracy.

Design/methodology/approach

The unsteady Reynolds-averaged Navier–Stokes equations are solved using the computational fluid dynamics (CFD) technique. Two types of grid topology around the blades, namely, O-grid (OG) and C-grid (CG) types, are considered for grid sensitivity studies.

Findings

With regard to the power coefficient (Cp), simulation results have shown significant improvements of predictions using compared to other turbulence models such as the k-e model. The Cp distributions predicted by applying the CG mesh are in good agreement with the experimental data than that by the OG mesh.

Research limitations/implications

The current study provides some new insights of the use of SBES turbulence model in VAWT CFD simulations.

Practical implications

The SBES turbulence model can significantly improve the numerical accuracy on predicting the VAWT performance at a lower tip speed ratio (TSR), which other turbulence models cannot achieve. Furthermore, it has less computational demand for the finer grid resolution used in the RANS-Large Eddy Simulation (LES) “transition” zone compared to other hybrid RANS-LES models.

Originality/value

To authors’ knowledge, this is the first attempt to apply SBES turbulence model to predict VAWT performance resulting for accurate CFD results. The better prediction can increase the credibility of computational evaluation of a new or an improved configuration of VAWT.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 31 no. 2
Type: Research Article
ISSN: 0961-5539

Keywords

Article
Publication date: 2 September 2014

Niklas Arvidsson

The purpose of this study is to understand turbulence in the field of payments in Europe and which future challenges this bring. The objective is to enable actors – industrial as…

1171

Abstract

Purpose

The purpose of this study is to understand turbulence in the field of payments in Europe and which future challenges this bring. The objective is to enable actors – industrial as well as policy-making agencies – to avoid becoming passive and reluctant to take needed steps that may realize a new playing field for payments.

Design/methodology/approach

The article uses scenario analysis methodology to propose a way forward if the field of payments is to move away from turbulence and instead embrace renewal. It is based on a literature study, interviews and workshops.

Findings

This article discusses and shows how the payment system is in a state of turbulence, which in itself, may become a self-reinforcing negative process. The seemingly rational competitive actions that firms take in this situation may make the situation worse. The article also outlines critical action that must be taken to avoid this negative process.

Research limitations/implications

There is a need for research that integrates studies on innovation and renewal in the critical industries – banking, telecom and the system driving industries – to improve our understanding of possible synergies and/or obstacles to integrated, cross-industry innovation efforts. Such insights may also lay the foundation for the creation of a way to overcome turbulence.

Practical implications

The article advocates the need that critical actors collaborate to develop a new understanding – or common ground – of a future payment system. This will serve as a tool to identify obstacles and challenges, develop action and formulate agendas for different actors in and around the system. Based on the new common ground, actors are then free to formulate their own strategic agendas in a new competitive landscape in the field of payments.

Social implications

If the turbulence is to be avoided, national governments in the euro area and the European Union Commission must work hard to avoid national exemptions and adaptations (often caused by strong lobbying by companies from each country in question). Innovation agencies must work so as to stimulate renewal. Another task could be to educate consumers on the social and economic benefits of moving away from a cash-based payment system.

Originality/value

The originality of this paper is to test the idea that turbulence and the consequential inertia in the payment system is a result of the institutional set-up of the industry. In addition, the article uses causal texture theory and scenario analysis to understand turbulence and inertia in the payment system. This has, to my knowledge, not been done before.

Details

Foresight, vol. 16 no. 5
Type: Research Article
ISSN: 1463-6689

Keywords

Article
Publication date: 20 May 2020

Ming-Chao Wang, Pei-Chen Chen and Shih-Chieh Fang

Environmental turbulence represents a double-edged sword, simultaneously fueling and hindering a firm’s entrepreneurial orientation (EO). Drawing on the theories of EO and network…

1491

Abstract

Purpose

Environmental turbulence represents a double-edged sword, simultaneously fueling and hindering a firm’s entrepreneurial orientation (EO). Drawing on the theories of EO and network relationships, this study aims to develop and test a conceptual model that provides a nuanced account of the relationship between environmental turbulence and firm EO.

Design/methodology/approach

Data for this study were collected using a survey of high-technology firms in Hsinchu Science Park (HSP) in Taiwan. Questionnaires were mailed to 297 high-technology firms in the semiconductor, photoelectric and communication industries within HSP. Completed questionnaires were received from 94 firms, which included responses from 94 research and development managers and 462 employees.

Findings

The results reveal that the degree of environmental turbulence exhibits an inverted U-shaped relationship with a firm’s EO. Moreover, this relationship is positively moderated by network relationships between firms, but negatively moderated by organizational inertia.

Originality/value

The empirical and conceptual findings have important implications for understanding EO, because the findings explain causal relationships that transform a firm’s interactive and inner control capabilities into firm-level results.

Details

Journal of Business & Industrial Marketing, vol. 36 no. 1
Type: Research Article
ISSN: 0885-8624

Keywords

1 – 10 of over 10000