Discrete roughness elements
WebJan 4, 2010 · Finally, we note that wakes behind sufficiently large discrete roughness elements can sustain large modal amplification of streak instabilities as shown by …
Discrete roughness elements
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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 … 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 …
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, … 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.
WebAug 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 DRE spacing and freestream turbulence. Measurements by Hunt and Saric (2011) of perturbation mode shape at … WebJul 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 …
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 …
WebMar 9, 2024 · First, an ideal control scenario was identified by several stability analysis solvers, and receptivity to stationary vortices behind conventional cylindrical discrete roughness elements (DREs) and SREs was simulated by means of direct numerical simulation (DNS). The critical heights of the two devices were next assessed with DNS. brics def geoWebMar 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 … brics da chinaWebOct 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, … brics dubaiWebMar 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. brics currency to usdWebOct 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 … brics development bank nameWebJan 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 brics definitionWebOct 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. brics development limited