Effects of time dependence in unstratified tidal boundary layers: results from large eddy simulations

2005 ◽  
Vol 62 (1-2) ◽  
pp. 193-204 ◽  
Author(s):  
Ming Li ◽  
Larry Sanford ◽  
Shenn-Yu Chao
Keyword(s):  
Time Dependence ◽  
Boundary Layers ◽  
Large Eddy Simulations ◽  
Large Eddy

Multi-Block Large-Eddy Simulations of Turbulent Boundary Layers

2000 ◽  
Vol 157 (1) ◽  
pp. 256-279 ◽  
Author(s):  
Andrea Pascarelli ◽  
Ugo Piomelli ◽  
Graham V. Candler
Keyword(s):  
Boundary Layers ◽  
Turbulent Boundary Layers ◽  
Large Eddy Simulations ◽  
Large Eddy

scholarly journals Large‐eddy simulations of the evolution of imposed turbulence in forced boundary layers in a very long domain

Wind Energy ◽  
2020 ◽  
Vol 23 (6) ◽  
pp. 1482-1493
Author(s):  
Ola Eriksson ◽  
Karl Nilsson ◽  
Simon‐Philippe Breton ◽  
Stefan Ivanell
Keyword(s):  
Boundary Layers ◽  
Large Eddy Simulations ◽  
Large Eddy

Results and Analysis of Implicit Large Eddy Simulations of Equilibrium Spatially Developing Turbulent Boundary Layers at Multiple Mach Numbers

2014 ◽  
Author(s):  
Mbu Waindim ◽  
Datta V. Gaitonde
Keyword(s):  
Boundary Layers ◽  
Plate Boundary ◽  
Large Eddy Simulations ◽  
Upstream Region ◽  
Computational Domain ◽  
Turbulent Characteristics ◽  
Large Eddy ◽  
Mach Numbers ◽  
Dimensional Simulation ◽  
Invariant Statistics

Equilibrium turbulent flat plate boundary layers with time invariant statistics were obtained at Mach numbers 1.7, 2.3, and 2.9. These are to be used as the initial condition for Large Eddy Simulations (LES) or Direct Numerical Simulations (DNS) of shock wave/turbulent boundary layer interactions utilizing a body force-based method. The results obtained are supplemented by an analysis of the mean and statistical properties of the respective boundary layers. The spanwise extent of the domain required to allow adequate decorrelation between the centerline and the boundaries is investigated by extensively probing the flowfields obtained. This is done to quantify the coherent structures of the turbulent flow. Specifically, two point correlations and integral length scales are used to investigate spanwise decorrelation distances in an attempt to pick a computational domain which is large enough to permit decorrelation downstream but small enough to minimize computational costs. It is shown that by examining the precursor events in the upstream region, namely the generalized stability criterion, it is possible to provide estimates for the force field parameters necessary for transition for a given flow, with only a small portion of the domain in the neighborhood of the trip. The technique is made even more efficient by investigating the possibility of determining these parameters using a two-dimensional simulation. Additionally, the three flow fields obtained are surveyed to confirm that they are suitable for subsequent SBLI simulations. We check that (i)they possess the expected turbulent characteristics and (ii)there is no signature of the tripping mechanism.

LES Validation for a Rotating Cylindrical Cavity With Radial Inflow

2016 ◽  
Author(s):  
Michel Onori ◽  
Dario Amirante ◽  
Nicholas J. Hills ◽  
John W. Chew
Keyword(s):  
Boundary Layers ◽  
Source Region ◽  
Tangential Velocity ◽  
Large Eddy Simulations ◽  
Navier Stokes ◽  
Subgrid Scale ◽  
Rotating Cavity ◽  
Scale Models ◽  
Large Eddy ◽  
Type Boundary

This paper describes Large-Eddy Simulations (LES) of the flow in a rotating cavity with narrow inter-disc spacing and a radial inflow introduced from the shroud. Simulations have been conducted using a compressible, unstructured, finite-volume solver, and testing different subgrid scale models. These include the standard Smagorinsky model with Van Driest damping function near the wall, the WALE model and the implicit LES procedure. Reynolds averaged Navier-Stokes (RANS) results, based on the Spalart-Allmaras and SST k-ω models, are also presented. LES solutions reveal a turbulent source region, a laminar oscillating core with almost zero axial and radial velocity and turbulent Ekman type boundary layers along the discs. Validations are carried out against the experimental data available from the study of Firouzian et al. [1]. It is shown that the tangential velocity and the pressure drop across the cavity are very well predicted by both RANS and LES, although significant differences are observed in the velocity profiles within the boundary layers.

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