Modeling unsteady turbulent flows over ripples: Reynolds-averaged Navier-Stokes equations (RANS) versus large-eddy simulation (LES)

Modeling unsteady turbulent flows over ripples: Reynolds-averaged Navier-Stokes equations (RANS) versus large-eddy simulation (LES)

[1] In this paper we consider the problem of modeling a turbulent pulsating boundary layer over ripples. We compare the results of two modeling strategies, Wilcox’s k w Reynolds-Averaged Navier-Stokes equations (RANS) and large-eddy simulation (LES) employing the Lagrangian dynamic eddy viscosity model. The geometry and parameters employed are relevant to nearshore oceanic flows, and the result...

Modeling unsteady turbulent flows over ripples: RANS versus LES

Simulation of Synthetic Jets in Quiescent Air Using Unsteady Reynolds Averaged Navier-stokes Equations

We report research experience in applying an Unsteady Reynolds-Averaged Navier-Stokes (URANS) solver for the prediction of time-dependent flows in the presence of an active flow control device. The configuration under consideration is a synthetic jet created by a single diaphragm piezoelectric actuator in quiescent air. Time-averaged and instantaneous data for this case were obtained at Langley...

Large-eddy/Reynolds-averaged Navier–Stokes simulation of a supersonic reacting wall jet

This work presents results from large-eddy/Reynolds-averaged Navier–Stokes (LES/RANS) simulations of the well-known Burrows–Kurkov supersonic reacting wall-jet experiment. Generally good agreement with experimental mole fraction, stagnation temperature, and Pitot pressure profiles is obtained for non-reactive mixing of the hydrogen jet with a non-vitiated air stream. A lifted flame, stabilized ...

Simulation of Shockwave-turbulent Boundary Layer Interactions Usingthe Reynolds-averaged Navier-stokes Equations

The paper examines the capability for numerical simulation of three-dimensional shock wave turbulent boundary layer interactions using the Reynolds-averaged Navier-Stokes equations. Two con gurations are considered, namely, the single and double n interactions. Numerical simulations were performed by an international group of researchers as part of an AGARD-sponsored study of capabilities for s...