1,698 research outputs found
I+E Illumination and Emanation; Light as Body Adornment and the Implications of Wearable Light
No full textI+E Illumination and Emanation; Light As Body Adornment and the Implications of Wearable Light is practice-based research that exploits advances in miniature light sources in order to establish new forms of aesthetic expression through wearable light.
I+E investigates how wearable light interacts with the body and its environment; it explores how this interaction shapes the visual perception of the body and establishes a critical framework for the description and evaluation of wearable light.
Practice working with light and body crosses disciplines from jewellery and fashion to fine art, performance and lens-based media. Wearable light, however, is a new field with few precedents and potential for future applications in sportswear, therapeutic rehabilitation and personal safety.
A reflexive, and adaptive methodology characterized the research process in which practice was the main vehicle, informed by the selection of critical context and continuous external feedback. Due to the cross-disciplinary nature of wearable light collaborative projects with practitioners in art & design and technological experts were balanced with experimental solo projects.
The research outcome is a body of work that investigates wearable light in a variety of applications such as light jewellery, performance and lens-based media.
Original contributions to knowledge are: in developing an experimental, practice-based research methodology with a particular focus on the role of collaborations vis-à-vis solo projects, and the expansion of the role of the practitioner from designer-maker to ‘auteur’, the focus and conduit in the practice of a new and complex performance art based on wearable light; in developing a critical vocabulary for the description and evaluation of wearable light and in investigating the mechanics of placing light on the body and its effects on the perception of the body in its environment
Symmetry analysis in linear compressible hydrodynamic stability theory
No full textWe present a unifying solution framework for the linearized gas-dynamical equations for a two-dimensional (2-D) linearly-sheared unbounded homentropic compressible flow using Lie symmetry classification. The full set of symmetries that are admitted by the underlying system of equations are employed to systematically derive three distinct invariant Ansatz functions, which unify the existing ones for normal mode, Kelvin mode analysis, as well as a novel approach. The latter approach considers modes that are localized in the cross-stream and periodic in the streamwise direction and travel on parabola shaped curves at constant velocity in the cross-stream, while being accelerated constantly in streamwise direction by the underlying base flow
Turbulent plane Couette flow with wall-transpiration
No full textIn the present abstract, DNS results obtained for turbulent plane Couette flow with wall-normal transpiration velocity are presented. Important equations valid in such a flow are derived, describing the total shear stress and the relation between the friction velocities at the lower and upper wall. These expressions are of importance, as there are neither experimental nor DNS data to compare with. Equally important, we derive a center region and a viscous sublayer velocity scaling for the suction wall, which were both validated using the DNS data
DNS Channel Data Re_tau=10000
No full textThis dataset contains the mean flow, intensities, and turbulent budgets of a new Direct Numerical Simulation of a Poiseuille channel flow that has been conducted for a friction Reynolds number of 10000, using the pseudo-spectral code LISO.Authors:M. Oberlack, S. Kraheberger, J. Laux, TU Darmstadt.S. Hoyas, F. Alcantara-Avila, Universitat Politècnica de ValènciaReferences:Turbulence Statistics of Arbitrary Moments of Wall-Bounded Shear Flows: A Symmetry Approach, M. Oberlack, S. Hoyas, S. Kraheberger, F. Alcantara-Avila and J. Laux, Phys. Rev. Lett. 128, 024502 – Published 10 January 2022.Wall turbulence at high friction Reynolds numbers, S. Hoyas, M. Oberlack, S. Kraheberger, F. Alcantara-Avila and J. Laux, Phys. Rev. Fluids 7, 014602 – Published 10 January 2022.Data:The data can be directly loaded in Matlab.NOMENCLATURE:x = streamwise coordinatey = wall-normal coordinatez = spanwise coordinateh = channel half-widthU = mean streamwise velocityutau = friction velocitynu = kinematic viscosityRetau = Reynolds number utau*h/nuu',v',w' = rms values of streamwise, wall-normal and spanwise velocity fluctuationsuv', = Reynolds shear stressesdU/dy = viscous stress(.)+ = normalized by utau and nunx = 6144
ny = 2101
nz = 6144BOX SIZE in h (x,y,z): 2pi|2|1piFLOW CONDITIONS: Retau = 10049 (Re = 290000. Rebulk = 257143 ), utau = 0.034629, ubulk = 0.886746.Files:1. P10k.txt: Mean flow and intensities.2\. P10k: turbulent budgets.Contact:Email Sergio Hoyas, [email protected] about any issue with the data.The authors gratefully acknowledge providing computing time on the Gauss Centre for Supercomputing e.V.~on the GCS Supercomputer SuperMUC-NG at Leibniz Supercomputing Centre under project number pr92la, on the supercomputer Lichtenberg II at TU Darmstadt under project number project00072 and on the supercomputer CLAIX-2018 at RWTH-Aachen, project bund0008. SK and MO would like to acknowledge her funding by the German Research Foundation (DFG) through the project OB96/39-1 and OB96/48-1. SH and FAA were supported by contract RTI2018-102256-B-I00 of MINECO/FEDER. FAA is partially funded by GVA/FEDER project ACIF2018
CICLoPE -A large pipe facility for detailed turbulence measurements at high Reynolds number
No full textDNS Channel Data Re_tau=10000 high moments
No full textThis dataset contains the statistical moments based on the instantaneous velocities (H-moments) up to order 6 of a new Direct Numerical Simulation of a Poiseuille channel flow that has been conducted for a friction Reynolds number of 10000, using the pseudo-spectral code LISO.Authors:M. Oberlack, S. Kraheberger, J. Laux, TU Darmstadt.S. Hoyas, F. Alcantara-Avila, Universitat Politècnica de ValènciaReferences:1. Turbulence Statistics of Arbitrary Moments of Wall-Bounded Shear Flows: A Symmetry Approach, M. Oberlack, S. Hoyas, S. Kraheberger, F. Alcantara-Avila and J. Laux, Phys. Rev. Lett. 128, 024502 – Published 10 January 2022.2. Wall turbulence at high friction Reynolds numbers, S. Hoyas, M. Oberlack, S. Kraheberger, F. Alcantara-Avila and J. Laux, Phys. Rev. Fluids 7, 014602 – Published 10 January 2022.Please check the final references before citing these papersData:The data can be directly loaded in Matlab.NOMENCLATURE:x = streamwise coordinatey = wall-normal coordinatez = spanwise coordinateh = channel half-widthU^n = nth-order moment of mean streamwise velocityutau = friction velocity(.)b = normalized by ubulknx = 6144
ny = 2101
nz = 6144BOX SIZE in h (x,y,z): 2pi|2|1piFLOW CONDITIONS: Retau = 10049 (Re = 290000. Rebulk = 257143 ), utau = 0.034629, ubulk = 0.886746.Files:H_U1_Moments.txt: U_1 velocity moments of the instantaneous velocities (H-moments) up to order 6 of the Channel Flow DNS at Re_tau=10^4 as functions of the wall distance y (x_2).Contact:Email Sergio Hoyas, [email protected] about any issue with the data.The authors gratefully acknowledge computing time on the Gauss Centre for Supercomputing e.V. on the GCS Supercomputer SuperMUC-NG at Leibniz Supercomputing Centre under Project No. pr92la, on the supercomputer Lichtenberg II at TU Darmstadt under Project No. project00072, and on the supercomputer CLAIX-2018 at RWTH-Aachen under Project No. bund0008. S. V. K. gratefully acknowledges funding from projects OB96/39-1 and M.O. for partial funding from OB 96/48-1, both financed by the German Research Foundation (DFG). S. H. and F. A.-A. were supported by Contract No. RTI2018-102256-B-I00 of MINECO/FEDER. F. A.-A. is partially funded by GVA/FEDER project ACIF2018. Finally, the authors thank Paul Hollmann for help with the manuscript
Numerical Investigation of the AFRODITE Transition Control Strategy
No full textAFRODITE is a financed project by the European Research Council aimed at experimentally investigating passive flow control methods for transition delay and hence skin-friction drag reduction. The transition delay is here obtained by generating longitudinal high speed streaks in the boundary layer (BL) by means of Miniature Vortex Generators (MVGs) mounted on the wall surface. The present work details the Direct Numerical Simulation (DNS) setup designed to reproduce the AFRODITE experiments and provide results showing that the proposed DNS is in good agreement with the experiments. The results of the DNS also show that even a minimal delay of the transition point results in an overall gain in terms of drag when MVGs are installed on the plate
CICLoPE – A Large Pipe Facility for Detailed Turbulence Measurements at High Reynolds Number
No full textHigh Reynolds number turbulence is ubiquitous in a number of flow of practical interest and crucial to draw conclusions regarding the physics of turbulence. Although recent laboratory experiments, measurements in planetary boundary layer and direct numerical simulations provide a huge amount of information, none of these data sets provide high Reynolds number, high spatial resolution and well converged statistics at the same time. As a response to this problem, an international collaboration between a group of universities and research centers started some years ago to build large scale infrastructures for high Reynolds number experiments. The Center for International Cooperation in Long Pipe Experiments, CICLOPE (www.ciclope.unibo.it) at the University of Bologna, was created for this purpose and will be open to international scientists through different collaboration programs. The laboratory is currently under construction and the first facility, which will be installed there is a large pipe flow experiment that will allow fully resolved turbulence measurements even at high Reynolds number
Turbulence and Uncertainty for Future Renewable Energy Reliability
No full textCurrent climate change concerns accelerate interest in developing reliable renewable energy sources. Two of the most significant, in the wind and sea, are subject to turbulence, where its mathematics are at the forefront and the topic of this Conference.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Wind Energ
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