This paper extends the resolvent formulation proposed by McKeon & Sharma (J. Fluid Mech., vol. 658, 2010, pp. 336–382) to consider turbulence–compliant wall interactions. Under this formulation, the turbulent velocity field is expressed as a linear superposition of propagating modes, identified via a gain-based decomposition of the Navier–Stokes equations. Compliant surfaces, modelled as a comp...

A point-force model is used to study turbulent momentum transfer in the presence of moderate mass loadings of small (relative to Kolmogorov scales), dense (relative to the carrier phase density) particles. Turbulent Couette flow is simulated via direct numerical simulation, while individual particles are tracked as Lagrangian elements interacting with the carrier phase through a momentum coupli...

Shock-wave/turbulent boundary-layer interactions are still a challenge for numerical simulation. The shock capturing needs dissipation to avoid spurious oscillations while turbulence will be falsified by introducing dissipation. Especially, an accurate prediction of quantities such as the skin-friction coefficient inside interaction area wave and turbulent flow is critical point. In this articl...

We derive a limit on energy savings in controlled channel flow. For flow driven by pressure, shear or any combination of the two, and via wall transpiration spanwise motion, uncontrolled laminar state requires least net (accounting for energetic cost control). Thus, optimal control solution is to laminarize Additionally, we raise possibility beating this limit. By simultaneously applying show t...

We report on the isogeometric residual-based variational multiscale (VMS) Large Eddy Simulation of a fully developed turbulent flow over a wavy wall. To assess the predictive capability of the VMS modeling framework, we compare its predictions against the results from direct numerical simulation (DNS) and, when available, against experimental measurements. We use C quadratic B-spline basis func...

STUDY OBJECTIVE To compare the effect of high-frequency oral airway oscillation, high-frequency chest wall oscillation, and conventional chest physical therapy (CPT) on weight of expectorated sputum, pulmonary function, and oxygen saturation in outpatients with stable cystic fibrosis (CF). DESIGN Prospective randomized trial. SETTING Pediatric pulmonary division of a tertiary care center. ...

The three-dimensional flow over a low-aspect-ratio (low- $A\!R$ ) trapezoidal plate is investigated experimentally with focus on how the tip effects impact structure and dynamics of separation bubble. chord-based Reynolds number $5800$ , angle attack varies from $4^\circ$ to $10^\circ$ . Once separates, bubble emerges features swallow-tailed that shrinks near midspan, which first found for flow...