[PDF] Top 20 Large-eddy Simulation of Turbulent Boundary Layers with Spatially Varying Roughness

... the boundary-layer growth and the roughness-scale variation coincide, for given α, the LES produces a statistically steady boundary-layer ...sufficiently large Reynolds number Re x , the ... See full document

... For better interpretation of these figures, the reader is referred to the web (colored) version of this article. In the near-wall region that is critical to our acoustic loading study, the results of the two higher-order ... See full document

... a spatially-developing 3D TBL inside a bent square duct (Schwarz & Bradshaw 1994) and 3D separated flows behind a skewed bump (Ching et ...duct simulation, the mean velocity profiles and crossflow ... See full document

... For better interpretation of these figures, the reader is referred to the web (colored) version of this article. In the near-wall region that is critical to our acoustic loading study, the results of the two higher-order ... See full document

... numerical simulation of the TBL including high-order nonspectral methods and boundary conditions suitable for spatially developing flows with only one, as opposed to two, homogeneous ...of ... See full document

... Flat-plate turbulent boundary layers: background Research on turbulent boundary layers (TBL) has a long ...the turbulent zone, or TBL thickness δ(x), and the wall shear ... See full document

... sampled eddy will be rejected. The role of Z is to impose a threshold eddy Reynolds number that must be exceeded to allow eddy ...the eddy Reynolds number are sufficiently ...of eddy ... See full document

... thermally-stratified boundary layers and examined the use- fulness of our approach by comparing the simulated results with wind tunnel experimental ...the turbulent boundary layer is ... See full document

... of turbulent boundary layers (TBL) are investigated in detail in order to understand their possible connection with large scale structures which develop in the external ...flow ... See full document

... of roughness cannot be fully established until a systematic grid refinement study has been ...if roughness height is significant and elements are densely populated, then resolving the shear layer and the ... See full document

... nozzle-exit boundary layers now exhibit turbulent mean and RMS ve- locity profiles, with much larger fluctuation levels near the wall than in the baseline 10M case with the thin laminar ... See full document

... using large-eddy simulation in this ...a spatially-developing Ma = 2.3 turbulent boundary ...the boundary layer displacement thickness at the impinging point without ... See full document

... the simulation results and the experimental data are found for the verti- cal and spanwise profiles of the mean velocities and velocity standard deviations at different streamwise ...internal boundary layer ... See full document

... Conclusions Large-Eddy Simulation of a Mach ...a spatially-developing turbulent boundary layer along a flat plate is carried ...the simulation results are validated with ... See full document

... the large eddies, carrying most of the turbulent kinetic energy, set the length and time scales that describe the rest of the small-scale ...overall turbulent flow ...high-Re boundary ... See full document

... reflective boundary condition, in which all the flow variables at the boundaries are extrapolated from the inside of the ...sponge layers with stretched meshes, and the low-order spatial filter 错误 ! ... See full document

... total turbulent stress changes linearly with height, from a value of −1 at the surface to a value of zero at the top of the boundary ...effective roughness length for all the different terrains under ... See full document

... At higher convective Mach number the fluid particles that start entering the mixing layer stay close to its edges for a longer time and are carried along before they penetrate inside. This can be seen from the elapsed ... See full document

... subsonic boundary layer on a flat plate with roughness elements distributed over the entire ...surface roughness on a spatially developing turbulent boundary layer (TBL) is ... See full document

... dynamic roughness appears to develop a thinner internal layer than the static roughness of the same height, although no minima corresponding to the δ 1 layer could be located with any confidence for the ... See full document