Reynolds number trends from DNS of the turbulent Ekman layer
Reynolds number trends from DNS of the turbulent Ekman layer
Direct numerical simulation of the neutrally stratified pressure-driven turbulent Ekman layer over a smooth flat surface has been performed at Reynolds number Re=2000 (based on geostrophic wind speed G, kinematic viscosity \nu and viscous boundary-layer depth D=\sqrt(2\nu/f), where f is the Coriolis parameter). The fully spectral Fourier/Jacobi MPI-based code has been run with a 1024\times1024\times200 grid on 104 processors of the UK HPCx IBM p690+ cluster, requiring approximately 100,000 CPU-node-hours to reach steady state and produce an adequate statistical sample. Results are used to quantify Reynolds number trends by comparing to earlier Re=400, 500 and 1000 DNS data. We are particularly interested in assessing the Spalart (1989) finite-Reynolds-number modification to the Csanady (1967) similarity theory for three-dimensional boundary layers, and implications for predicting the magnitude and direction of the surface shear stress at arbitrary Reynolds numbers
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Coleman, G.N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Johnstone, R.
8ac02aa2-776b-4f80-b44d-1a5cf8682f21
Ashworth, M.
a70c436c-8405-4518-806d-1003fd9d5386
2004
Coleman, G.N.
ea3639b9-c533-40d7-9edc-3c61246b06e0
Johnstone, R.
8ac02aa2-776b-4f80-b44d-1a5cf8682f21
Ashworth, M.
a70c436c-8405-4518-806d-1003fd9d5386
Coleman, G.N., Johnstone, R. and Ashworth, M.
(2004)
Reynolds number trends from DNS of the turbulent Ekman layer.
American Physical Society 57th Annual Meeting of the Division of Fluid Dynamics, Seattle, USA.
21 - 23 Nov 2004.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Direct numerical simulation of the neutrally stratified pressure-driven turbulent Ekman layer over a smooth flat surface has been performed at Reynolds number Re=2000 (based on geostrophic wind speed G, kinematic viscosity \nu and viscous boundary-layer depth D=\sqrt(2\nu/f), where f is the Coriolis parameter). The fully spectral Fourier/Jacobi MPI-based code has been run with a 1024\times1024\times200 grid on 104 processors of the UK HPCx IBM p690+ cluster, requiring approximately 100,000 CPU-node-hours to reach steady state and produce an adequate statistical sample. Results are used to quantify Reynolds number trends by comparing to earlier Re=400, 500 and 1000 DNS data. We are particularly interested in assessing the Spalart (1989) finite-Reynolds-number modification to the Csanady (1967) similarity theory for three-dimensional boundary layers, and implications for predicting the magnitude and direction of the surface shear stress at arbitrary Reynolds numbers
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Published date: 2004
Venue - Dates:
American Physical Society 57th Annual Meeting of the Division of Fluid Dynamics, Seattle, USA, 2004-11-21 - 2004-11-23
Identifiers
Local EPrints ID: 23087
URI: http://eprints.soton.ac.uk/id/eprint/23087
PURE UUID: e8842750-83cf-41a5-8474-2f3b44555aa4
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Date deposited: 09 Mar 2007
Last modified: 11 Dec 2021 14:42
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Author:
G.N. Coleman
Author:
R. Johnstone
Author:
M. Ashworth
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