A robust control framework is used to investigate a streamwise constant projection of the Navier Stokes equations for plane Couette flow. Study of this streamwise constant model is motivated by both numerical and experimental observations that suggest the prevalence and importance of streamwise and quasi-streamwise elongated structures. Small-amplitude Gaussian noise forcing is applied to a two...

To study the dynamical properties of plane Couette turbulence, this paper describes unstable periodic orbits (UPOs) in a large eddy simulation (LES) system with Smagorinsky-type viscosity model. At moderately high Reynolds number, UPO present possesses spanwise vortices central region channel, which seem to be caused by streak instability. These stretched are shown enhance transfer streamwise t...

The influence of spanwise flow on the development and stabilization of leading-edge vortices (LEVs) on a foil (without rotational acceleration) has been investigated. The plunging swept wing/fin geometry used in this study, characteristic of fish-like tails, has been found to be insufficient in the stabilization of LEVs. Direct force measurements and visualizations, including Particle Image Vel...

Single dielectric barrier discharge plasma actuators have been used to control flow separation in a large number of applications. An often used configuration involves spanwise-oriented asymmetric electrodes that are arranged to induce a tangential wall jet in the mean flow direction. For the best effect, the plasma actuator is placed just upstream of where the flow separation will occur. This a...

DNS of spatiotemporal evolution of a wake-type flow is performed. In the incoming flow, a local spanwise nonuniformity in momentum defect is initially imposed. Results show that the spanwise nonuniformity leads to a series of symmetric twist vortex dislocation in downstream of the flow. Vortex line variations and substantial transition of vorticity from spanwise to the streamwise and vertical d...

We characterize the turbulent flow, using direct numerical simulations (DNS), within a closed channel between two parallel walls with canopy of constant areal density profile on lower wall. The is modelled different formulations Forchheimer drag, and characteristic properties flows are compared. In particular, we examine influence added drag mean profiles flow balance equations kinetic energy. ...

Fully coupled CFD-CSD simulations using HPCMP CREATETM-AV Kestrel were performed to compute the dynamic aeroelastic behavior of a torsionally flexible, finite aspect ratio NACA0018 wing. The uncontrolled dynamic instability resulted a very periodic limit cycle oscillation largely governed by the dynamic stall phenomenon. Three-dimensional effects due to the spanwise twist variation produces a l...

The interaction between corner flow and heat transfer is very common in the internal external of hypersonic vehicle surface, but it not clear how wall thermal boundary condition affects supersonic layer. In present study, Reynolds stress model used to solve Reynolds-averaged Navier–Stokes equations. results show that when symmetrical temperature Tw less than or equal recovery Taw, mean velocity...