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Showing 1 to 4 of 4 for “"equivalent sand-grain roughness"”.
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Geometry-Aware Modeling of Rough-Wall Turbulence Using Reynolds-Averaged Navier-Stokes (RANS) Frameworks
… extensive research, the representation of roughness effects in Reynolds-Averaged Navier–Stokes (RANS) turbulence models remains fundamentally challenging. Classical approaches rely on hydrodynamic equivalence, typically through the equivalent sand-grain roughness height and empirical shifts …
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The Aerodynamics of Cricket Ball Swing
… coefficients between these two values. Surface roughness is shown to change the boundary layer state on used cricket balls, and is quantified using equivalent sand-grain roughness, ks, and roughness Reynolds Number, Rek. Conventional swing is maximised by creating a smooth surface on both sides …
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Effects of Various Shaped Roughness Elements in Two-Dimensional High Reynolds Number Turbulent Boundary Layers
Modeling the effects of surface roughness is an area of concern in many practical engineering applications. Many current roughness models to this point have involved the use of empirical 'constants' and equivalent sand grain roughness. These underdeveloped concepts have little direct relationship …
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Roughness Effects on Super Structures in Turbulent Boundary Layer Flows
This study investigates the influence of wall roughness on large-scale structures within turbulent boundary layers, using wall-parallel stereoscopic Particle Image Velocimetry (PIV) at a Reynolds number of 1.3 × 106m−1. The data was collected at a distance of = 2.8 from the wall under adverse = …