Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Rayhaneh Akhavan"'
Autor:
Amirreza Rastegari, Rayhaneh Akhavan
Publikováno v:
Journal of Fluid Mechanics. 864:327-347
The drag reduction characteristics and sustainability bounds of superhydrophobic (SH) surfaces in high Reynolds number turbulent flows are investigated using results from direct numerical simulation (DNS) and scaling-law analysis. The DNS studies wer
Autor:
Rayhaneh Akhavan, Amirreza Rastegari
Publikováno v:
Journal of Fluid Mechanics. 838:68-104
Turbulent skin-friction drag reduction with superhydrophobic (SH) longitudinal microgrooves and riblets is investigated by direct numerical simulation (DNS), using lattice Boltzmann methods, in channel flow. The liquid/gas interfaces in the SH longit
Autor:
Rayhaneh Akhavan, Yifeng Tang
Publikováno v:
Journal of Fluid Mechanics. 793:709-748
A new nested-LES approach for computation of high Reynolds number, equilibrium, and non-equilibrium, wall-bounded turbulent flows is presented. The method couples coarse-resolution LES in the full computational domain with fine-resolution LES in a mi
Autor:
Rayhaneh Akhavan, Yifeng Tang
Publikováno v:
Progress in Wall Turbulence 2 ISBN: 9783319203874
A new nested LES approach for computing high Reynolds number, wall-bounded turbulent flows is presented. The method is based on nested LES of the full-domain at coarse resolution, coupled with well-resolved LES of a minimal flow unit. The coupling be
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e81ca46bd9b4831aab3f47ba3b8ac964
https://doi.org/10.1007/978-3-319-20388-1_11
https://doi.org/10.1007/978-3-319-20388-1_11
Autor:
Amirreza Rastegari, Rayhaneh Akhavan
Publikováno v:
Progress in Wall Turbulence 2 ISBN: 9783319203874
The structure and dynamics of turbulence in turbulent channel flow with super-hydrophobic (SH) walls has been investigated using DNS with Lattice Boltzmann methods. The channel walls consisted of longitudinal arrays of SH microgrooves of width g, sep
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a05ee93525479bd6d83a917915baf61e
https://doi.org/10.1007/978-3-319-20388-1_32
https://doi.org/10.1007/978-3-319-20388-1_32
Autor:
Amirreza Rastegari, Rayhaneh Akhavan
Publikováno v:
Journal of Fluid Mechanics. 773
The mechanism of turbulent drag reduction (DR) with super-hydrophobic (SH) surfaces is investigated by direct numerical simulation (DNS) and analysis of the governing equations in channel flow. The DNS studies were performed using lattice Boltzmann m
Publikováno v:
Journal of Fluid Mechanics. 408:83-120
The dynamics of subgrid-scale energy transfer in turbulence is investigated in a database of a planar turbulent jet at Reλ ≈ 110, obtained by direct numerical simulation. In agreement with analytical predictions (Kraichnan 1976), subgrid-scale ene
Publikováno v:
Magnetic Resonance Imaging. 14:121-128
A simple, mechanical infusion pump that employs a constant force, nonferromagnetic spring to squeeze a syringe is described. The contrast infusion rate is determined by the spring force, gadolinium solution viscosity, and the resistance of either a u
An investigation of transition to turbulence in bounded oscillatory Stokes flows Part 1. Experiments
Publikováno v:
Journal of Fluid Mechanics. 225:395-422
Experimental results on flow-field statistics are presented for turbulent oscillatory flow in a circular pipe for the range of Reynolds numbers Reδ = U0δ/ν (U0 = amplitude of cross-sectional mean velocity, δ = (2ν/ω)½) = Stokes layer thickness
Publikováno v:
Journal of Fluid Mechanics. 225:423-444
The stability of oscillatory channel flow to different classes of infinitesimal and finite-amplitude two- and three-dimensional disturbances has been investigated by direct numerical simulations of the Navier–Stokes equations using spectral techniq