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Organization and management scholars are increasingly interested in understanding how “fluid” forms of organizing contribute to the tackling of grand challenges. These forms are fluid in that they bring together a dynamic range of actors with diverse purposes, expertise, and interests in a temporary and nonbinding way. Fluid forms of organizing enable flexible participation. Yet, they struggle to gain and sustain commitment. In this case study of the SDG2 Advocacy Hub, which supports the achievement of zero hunger by 2030, we explore how the temporality of narratives contributes to actors’ commitment to tackling grand challenges in fluid forms of organizing. In our analysis, we identify three types of narratives – universal, situated, and bridging – and discern their different temporal horizons and temporal directions. In doing so, our study sheds light on the contributions by the temporality of narratives to fostering commitment to tackling grand challenges in fluid forms of organizing. It suggests the importance of considering “multitemporality,” i.e., the plurality of connected temporalities, rather than foregrounding either the present or the future.

Managing severe sepsis early has several benefits. Correct early management includes delivering an appropriate fluid challenge. The purpose of this paper is to assess whether junior doctors prescribe adequate fluid challenges to severely septic patients.

A questionnaire outlining three scenarios, each involving a patient with severe sepsis, but with varying weights (50/75/100 kg), was distributed to junior doctors, working in two UK hospitals, managing surgical patients. Participants were asked the fluid volume challenge that they would prescribe for each patient. Responses were compared with the Surviving Sepsis Campaign's recommended volume during the study (20 ml/kg).

Totally, 77 questionnaires were completed. There were 15/231 (6.5 per cent) correct responses. The median volume chosen in each scenario was 500 ml, equating to 5-10 ml/kg. There was no significant difference between doctor grades (FY1 and SHO) in any scenario. With most junior doctors (FY1), there was no difference in responses according to weight; for SHOs the only significant difference was between the 75 and 100 kg scenarios.

Junior doctors are not following guidelines when prescribing fluid challenges to severely septic patients, giving too little and not adjusting volume according to body weight. This implies that high-prevalence, high-mortality conditions are not being treated appropriately by those most likely to treat these patients. More teaching, training and reassessment is required to improve care.

This, the first case-based survey the authors could find, highlights an issue requiring significant improvement. The implications are likely to be relevant to clinicians in all UK hospitals.

The purpose of this paper is to chronicle new user experience (UX) design approaches being pioneered in an international, multi‐institution, multi‐sector, cross‐project initiative called the Fluid Project, covering the strengths and shortcomings of these approaches and the lessons learned about design and development in distributed communities.

Open source and community source software development projects have not fulfilled their promise of innovation and natively optimized tools and applications in large part due to a lack of integrated UX design and development processes. Fluid has developed a UX approach that aims to address the need to accommodate the huge diversity of users and contexts in academic communities as well as the critical need to improve the user experience.

It has been found that the Fluid approach challenges common or traditional notions integral to teaching in higher education, software design, user interaction design methods, usability research and accessibility strategies. It proposes greater individual control over the UX than most users may be ready to assume despite obvious benefits. An unexpected UX challenge is creating tools and applications that prompt and support users in configuring their systems to their personal needs and contexts.

Fluid has designed and prototyped new UX design methods, pedagogical practices, and usability and accessibility approaches to suit the context of distributed academic communities and open source development, while at the same time producing a UX system of benefit to the mashup or integration of any set of disparate tools.

The purpose of this study is to perform a detailed review on the numerical modeling of multiphase and multicomponent flows in microfluidic system using phase-field method. The phase-field method is of emerging importance in numerical computation of transport phenomena involving multiple phases and/or components. This method is not only used to model interfacial phenomena typical to multiphase flows encountered in engineering and nature but also turns out to be a promising tool in modeling the dynamics of complex fluid-fluid interfaces encountered in physiological systems such as dynamics of vesicles and red blood cells). Intrinsically, a priori unknown topological evolution of interfaces offers to be the most concerning challenge toward accurate modeling of moving boundary problems. However, the numerical difficulties can be tackled simultaneously with numerical convenience and thermodynamic rigor in the paradigm of the phase field method.

The phase-field method replaces the macroscopically sharp interfaces separating the fluids by a diffuse transition layer where the interfacial forces are smoothly distributed. As against the moving mesh methods (Lagrangian) for the explicit tracking of interfaces, the phase-field method implicitly captures the same through the evolution of a phase-field function (Eulerian). In contrast to the deployment of an artificially smoothing function for the interface as used in the volume of a fluid or level set method, however, the phase-field method uses mixing free energy for describing the interface. This needs the consideration of an additional equation for an order parameter. The dynamic evolution of the system (equation for order parameter) can be described by Allen–Cahn or Cahn–Hilliard formulation, which couples with the Navier–Stokes equation with the aid of a forcing function that depends on the chemical potential and the gradient of the order parameter.

In this review, first, the authors discuss the broad motivation and the fundamental theoretical foundation associated with phase-field modeling from the perspective of computational microfluidics. They subsequently pinpoint the outstanding numerical challenges, including estimations of the model-free parameters. They outline some numerical examples, including electrohydrodynamic flows, to demonstrate the efficacy of the method. Finally, they pinpoint various emerging issues and futuristic perspectives connecting the phase-field method and computational microfluidics.

This paper gives unique perspectives to future directions of research on this topic.

In this chapter we examine various human resource management (HRM) implications involved in the leadership of fluid teams. Leadership of fluid teams, which are distinguished by their dynamic composition, requires consideration of issues that may not be as pertinent for stable teams. In particular, we focus on the concept of familiarity. Composing and leading teams with members exhibiting varying degrees of familiarity with one another creates obstacles to effective and efficient functioning and may ultimately lead to poor performance. With this in mind, leaders must pay particular attention to issues of coordination, and composition such that a broad range of generalizable teamwork skills exists within the team. Within this chapter, we explain the concepts of fluid teams, team leadership within fluid teams, and other relevant concepts related to the formation of familiarity. Next, we thoroughly review extant empirical and theoretical research within these areas. We identify areas of correspondence among the various concepts and findings of the reviewed studies and generate an integrated model of fluid team leadership. To conclude, we highlight the distinct HRM implications associated with the use, and leadership, of fluid teams.

This paper aims to summarize the latest developments both in terms of theoretical understanding and experimental techniques related to inkjet fluids. The purpose is to provide practitioners a self-contained review of how the performance of inkjet and inkjet-based three-dimensional (3D) printing is fundamentally influenced by the properties of inkjet fluids.

This paper is written for practitioners who may not be familiar with the underlying physics of inkjet printing. The paper thus begins with a brief review of basic concepts in inkjet fluid characterization and the relevant dimensionless groups. Then, how drop impact and contact angle affect the footprint and resolution of inkjet printing is reviewed, especially onto powder and fabrics that are relevant to 3D printing and flexible electronics applications. A future outlook is given at the end of this review paper.

The jettability of Newtonian fluids is well-studied and has been generalized using a dimensionless Ohnesorge number. However, the inclusion of various functional materials may modify the ink fluid properties, leading to non-Newtonian behavior, such as shear thinning and elasticity. This paper discusses the current understanding of common inkjet fluids, such as particle suspensions, shear-thinning fluids and viscoelastic fluids.

A number of excellent review papers on the applications of inkjet and inkjet-based 3D printing already exist. This paper focuses on highlighting the current scientific understanding and possible future directions.

A coupled numerical method for the direct simulation of particle‐fluid systems is formulated and implemented. The Navier‐Stokes equations governing fluid flow are solved using the lattice Boltzmann method, while the equations of motion governing particles are solved with the discrete element method. Particle‐fluid coupling is realized through an immersed moving boundary condition. Particle forcing mechanisms represented in the model to at least the first‐order include static and dynamic fluid‐induced forces, and intergranular forces including particle collisions, static contacts, and cementation. The coupling scheme is validated through a comparison of simulation results with the analytical solution of cylindrical Couette flow. Simulation results for the fluid‐induced erosive failure of a cemented particulate constriction are presented to demonstrate the capability of the method.

Societal grand challenges have moved from a marginal concern to a mainstream issue within organization and management theory. How diverse forms of organizing help tackle – or reinforce – grand challenges has become centrally important. In this introductory paper, we take stock of the contributions to the volume on Organizing for Societal Grand Challenges and identify three characteristics of grand challenges that require further scholarly attention: their interconnectedness, fluidity, and paradoxical nature. We also emphasize the need to expand our methodological repertoire and reflect upon our practices as a scholarly community.

This study presents a mathematical approach and model that can be useful to investigate the thermal performance of fluids with microstructures via hybrid nanoparticles in conventional fluid. It has been found from the extensive literature survey that no study has been conducted to investigate buoyancy effects on the flow of Maxwell fluid comprised of hybrid microstructures and heat generation aspects through the non-Fourier heat flux model.

Non-Fourier heat flux model and non-Newtonian stress–strain rheology with momentum and thermal relaxation phenomena are used to model the transport of heat and momentum in viscoelastic fluid over convectively heated surface. The role of suspension of mono and hybrid nanostructures on an increase in the thermal efficiency of fluid is being used as a medium for transportation of heat energy. The governing mathematical problems with thermo-physical correlations are solved via shooting method.

It is noted from the simulations that rate of heat transfer is much faster in hybrid nanofluid as compare to simple nanofluid with the increasing heat-generation coefficient. Additionally, an increment in the thermal relaxation time leads to decrement in the reduced skin friction coefficient; however, strong behavior of Nusselt number is shown when thermal relaxation time becomes larger for hybrid nanofluid as well as simple nanofluid.

According to the literature survey, no investigation has been made on buoyancy effects of Maxwell fluid flow with hybrid microstructures and heat generation aspects through non-Fourier heat flux model. The authors confirm that this work is original, and it has neither been published elsewhere nor is it currently under consideration for publication elsewhere.

We conduct a literature review on forms of organizing that address grand challenges, which are operationalized as the Sustainable Development Goals of the United Nations, as this framework is universal and widely adopted. By analyzing the articles that match our criteria, we identify six differentiable organizational forms: movements, temporary organizations, partnerships, established organizations, multi-stakeholder networks, and supranational organizations. These six forms are differentiated based on the two following categories: organizing segment and communicational technological approach. Our analysis shows that tackling a grand challenge often starts with collectives as a protest culture without any expected goal, besides sending an impulse to others. This impulse is received by criticized institutionalized organizations that have the capacity and resources to address the problem properly. However, new challenges arise as these organizations inadequately resolve these problems, thereby leading to conflict-laden areas of tension, wherein emergent organizations complement institutionalized organizations that have created the first infrastructure. To solve the most complex problems, a trichotomous relationship between different forms of organizations is necessary. Moreover, communicational technological approaches become more sophisticated as grand challenges increase in complexity.