2024 Discrete roughness elements

Discrete roughness elements

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August undefined, 2024

WebJan 1, 2015 · The laminar-turbulent transition induced by a sharp-edged quadrilateral isolated roughness element at Mach number \(M=6\) was investigated, focusing on the … WebSep 30, 2024 · 2.3 Distributed roughness elements Initial data showed a periodic variation in the mass flux, this was confirmed using CFD work showing that these variations may be …

Plasma virtual roughness elements for cross-flow instability …

WebJan 1, 2024 · In the current study, developed a roughness element of the discrete double arc reverse arc manner is used to improve the THP of the solar collector. During testing, … WebThe roughness elements consist of transverse square rods with a size k and are placed on one wall of the channel only. While k is kept constant ( k / h = 0.2, h is the half-width of … echostore technology

Discrete-roughness Effects in a Three-dimensional ... - ScienceDirect

WebOct 14, 2015 · The discrete element method allows predicting the flow over rough surfaces in a way consistent with the physics, contrary to the classical equivalent sand grain approach, and without requiring the meshing of all the surface details. Up to now, its use was restricted to boundary layer solvers. WebEach roughness element consists of a thermally conducting, horizontal cylinder of rectangular cross section attached to the heated, isothermal wall of an enclosure. The … WebJan 1, 2015 · The roughness elements under consideration, spaced by the spanwise periodicity length Î»z = 0.002, are introduced to the computational domain at Î¾ = 0.0285 by a smooth lift-up of the surface boundary. computechlimited.com

Mechanisms of flow tripping by discrete roughness …

Effect of wall blowing/suction on roughness-induced ... - Springer

WebThe flow behavior of cohesive NMC-622 cathode active material is studied in a Schulze RST-01 ring shear cell and a rotating drum. For both devices, experiments and simulations are done to characterize the dynamic behavior of the material and to calibrate all relevant parameters for a coarse-grained simulation model based on the discrete element … WebOct 1, 2024 · This simulates the flow over discrete roughness elements, where counter-rotating pairs of vortices develop around the neck of the roughness elements. A 14° right-circular cone was machined out of ceramic (Macor) to a thickness of about 0.4 mm, which acted as dielectric for DBD plasma actuators. echostor technologies careersWebAug 21, 2015 · Simulations have been carried out to predict the receptivity and growth of crossflow vortices created by Discrete Roughness Elements (DREs) The final transition to turbulence has also been examined, including the effect of … echo store wareham ma

"WebMar 12, 2015 · Nonlinear parabolized stability equations and secondary-instability analyses are used to provide a computational assessment of the potential use of the discrete-roughness-element technology for extending swept-wing natural laminar flow at chord Reynolds numbers relevant to transport aircraft. " - Discrete roughness elements

Discrete roughness elements

(PDF) Mechanisms of flow tripping by discrete roughness …

WebMar 12, 2015 · Nonlinear parabolized stability equations and secondary-instability analyses are used to provide a computational assessment of the potential use of the discrete … WebJul 24, 2013 · Direct numerical simulation (DNS) is used to study laminar to turbulent transition induced by a discrete hemispherical roughness element in a high-speed …

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WebNov 5, 2014 · In their computations, they report a complete analysis of the wake in front and behind a hemispherical roughness element with h / δ > 1 ( h is the element height and δ is the boundary layer thickness at the roughness location) at three Mach numbers ( … WebSep 30, 2024 · Spatially periodic distributed roughness elements (DREs) were used to enhance and regulate the 3-D modulations of the boundary layer and study how they interact with the flow characteristics that are present to begin with.

WebApr 24, 2024 · The roughness elements, whose shapes are chosen to enable simple, matched studies, are incorporated in the DNS using an immersed boundary method. The detailed evolution of the different components of the vorticity field is examined. WebOct 6, 2024 · Fractured seepage is an important factor affecting the interface stability of rock mass. It is closely related to fracture properties and hydraulic conditions. In this study, the law of seepage in a single fracture surface based on modified cubic law is described, and the three-dimensional discrete element method is used to simulate the dam foundation …

WebOct 29, 2013 · The results show that the roughness element, with a height of the order of the boundary layer displacement thickness, generates a highly unstable wake, … WebSep 9, 2024 · The egg-crate roughness pattern is an analytic function described by a sinusoidal equation, similar to an array of discrete elements that are positioned in a …

WebApr 24, 2024 · The roughness elements, whose shapes are chosen to enable simple, matched studies, are incorporated in the DNS using an immersed boundary method. The …

echo store in brandon flWebJun 25, 2012 · Laminar–turbulent transition induced by a discrete roughness element in a supersonic boundary layer. 29 October 2013 Journal of Fluid Mechanics, Vol. 735. High … echo strain protocolWebAug 8, 2024 · The surface morphology of fractures formed by hydraulic fracturing is usually rough. The roughness of the fracture surface is the main reason the actual fracture conductivity deviates from the ideal flat plate model result. In this paper, based on the three-dimensional reconfiguration of actual rough hydraulic fractures, a randomly generated … echo straps for blowerWebJan 2, 2024 · Micron-sized, spanwise-periodic Discrete Roughness Elements (DREs) were applied to the leading edge of a 30-degree swept-wing. The test article was attached vertically to the port wing of a Cessna… Expand 39 PDF Boundary-Layer Receptivity of Three-Dimensional Roughness Arrays on a Swept-Wing L. E. Hunt, W. Saric Physics 2010 computech ltd rwandaWebJul 21, 2024 · In this paper, we investigate the shielding effect of a two-dimensional downstream strip in the boundary layer disturbed by discrete smooth-edged roughness and focus on the shielding strip height k ss and the distance between the two areas of roughness x ss. Our results indicate that downstream shielding delays the transition by … echo straight shaft weed eaterWebMar 1, 2024 · The present simulation of the transition induced by the cylindrical roughness element will be compared with the experimental results in Ref. 6 The flow Mach number in the example is Ma = 6, the unit Reynolds number is Re = 2.6 × 10 7 /m, and the total pressure is P 0 = 3100 kPa. Calculation domain in streamwise is x = [40, 300] mm, in … echo strain pattern in amyloidosisWebNov 14, 2024 · mass finishing; centrifugal disc finishing; additive manufactured workpieces; discrete element method; roughness reduction; modeling. 1. Introduction. Centrifugal disc finishing is a mass finishing operation, in which free movable workpieces are machined in a bulk of abrasive media. The relative movement between the media and the workpieces is ... computech londrina