13,906 research outputs found
Der Viereckichte Haus- und Artzeney-Spiegel/ Genant Der Gelahrte Wall- und Wald-Mann : In welchem ein einfältiger Haus-Wirth sehen kan/ wie er (bey einfallender Kranckheit) nicht alleine sich/ besondern aus sein Haus-Gesinde/ könne curiren/ und zwar mit geringen Haus-Mitteln ... / Aus selbst-eigener Erfahrung ... heraus gegeben Vom Freund ... J. G. Wall-ich? Ich-wall! Medicinae Studioso
No full textYouthhood
No full textTESTING-GROUND issue 03, Youthhood, examines worlds through youthful eyes, makes evident young ambitions, and questions how we can better empower young people to design cities, landscapes, and a planet that works for them. The issue includes contributions from: Carmel Keren, Jude Daniel Smith, Claire Edwards, Kazeem Kuteyi, Emmanuel Adarkwah, Reza Nik, Dan Cui, Kristofer Cullum-Fernandez, Fida Sassi, Simeon Shtebunaev, Daze Aghaji, Averill Dimabuyu, Sarri Elfaitouri, Rebecca McDonald-Balfour, and Ed Wall.
Rebecca McDonald-Balfour (Author), Jude Daniel Smith (Author), Daze Aghaji (Author), Carmel Keran (Author), Alexis Liu (Author), Dan Cui (Author), Kristofer Cullum-Fernandez (Author), Fida Sassi (Author), Averill Dimabuyu (Author), Ed
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
Turbulent separation in lower curved wall channels
No full textTurbulent boundary layer separation in channels with a lower curved wall is studied using direct numerical simulations (DNS). Turbulence dynamics are studied through classical statistical tools such as the turbulent kinetic energy budget for varying lower curved wall dimensions. The geometry features are expected to have a significant effect on the fluid flow structures and the characteristic scales of separation. The separation bubble behind the bump is studied in terms of its size, turbulent kinetic energy production mechanisms and transfer and scale-by-scale energy budget. New innovative data-analysis techniques will be used based on the generalisation of the Kolmogorov equation to anisotropic and spatially non-homogeneous flow configurations
The influence of subgrid-scale modelling on the performance of a new non-equilibrium wall-model for large-eddy simulation
No full textThe computational cost of wall-resolved large-eddy simulations (LES) rapidly becomes prohibitive with increasing Reynolds number. Wall-modelled LES attempts to significantly reduce the computational cost of simulating wall-bounded turbulent flows by modelling the effect of the near-wall small-scale motions, rather than fully or partially resolving them. The present study concentrates on a new wall-model that is able to predict fluctuating wall-shear stress given a large-scale velocity input. The velocity input for the model is affected by the choice of subgrid-scale (SGS) model. Therefore, this study also focusses on the impact of the SGS-model on the distribution of quantities at the wall. Results show that the new wall-model is able to resolve more of the wall shear-stress variance than a standard wall-model; and that the SGS-model affects the distribution of fluctuations of both wall-shear stress and wall-pressure
Unsteady particle accumulation in wall turbulence
No full textWe propose the asymptotic theory of unsteady accumulation of inertial particles in the viscous sublayer of wall-bounded turbulent flow. We derive the diffusion equation for the particle concentration in the viscous sublayer and find the self-similar exact solution of this equation at large times. It is shown that near the wall the maximal concentration grows as the square root of time, while the distance from the wall to the concentration pike as well as its width decay as inverse square root of time. The obtained solution is corroborated by the results of stochastic Lagrangian simulations
Concrete Flow in Diaphragm Wall Panels: A Full-Scale In-Situ Test
No full textFlow processes, taking place during the concreting of diaphragm wall panels (D-wall panels), are of great importance for the quality of the wall. During this phase, the bentonite, present in the excavated trench, should be completely replaced by concrete in a controlled way. In literature several cases are described in which this process resulted in bentonite inclusions in the panel. These inclusions often lead to severe problems, like leakages, for the building pit to be excavated within the diaphragm wall panels. Beside the risks for the building pit, leakages caused by bentonite inclusions can also have large consequences for nearby constructions. In this article, set up and results of a full-scale diaphragm wall test are described. Conclusions are drawn with regard to the influence of several parameters on the flow process and subsequently on the quality of the wall and the risk on bentonite inclusions
Turbulent drag reduction using wall jets at flight scale Reynolds number
No full textNumerical experiments have been performed for modelling turbulent drag reduction due to active-control of wall jets using a linearised Navier-Stokes model in a turbulent boundary layer formed over a flat plate at Re _τ = 905 corresponding to flight scale Re_x = 10^6 . Its effect have been seen on transient growth of near-wall streaks and production of turbulent kinetic energy (TKE). Two sets, one corresponding to span wise slot and other corresponding to wall jets along the whole plate have been performed. Simulations are performed by varying magnitude of wall jets, its angle & locations and based on a measure of TKE, reduction in stream wise turbulent kinetic energy is recorded
Interview with Cheryl A. Wall
No full textCheryl Wall is a Board of Governors Zora Neale Hurston Distinguished Professor of English and former Chair of the English Department. Wall is an author and a specialist in Black women’s writing, the Harlem Renaissance, and Zora Neale Hurston. She is a co-chair of the President’s Council on Institutional Diversity and Equity. Joining Douglass in 1972 as an assistant instructor, Wall describes her role in the development of the college and its legacy today. She discusses the intrinsic value of the humanities in the context of a liberal arts education, student activism on campus, and the evolution of the Douglass Woman.Accompanied by transcrip
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