Implementation of a Nonlinear Subfilter Turbulence Stress Model for Large-Eddy Simulation in the Advanced Research WRF Model

Two formulations of a nonlinear turbulence subfilter-scale (SFS) stress model were implemented into the Advanced Research Weather Research and Forecasting model (ARW-WRF) version 3.0 for improved large-eddy simulation performance. The new models were evaluated against the WRF model’s standard Smagor...

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Bibliographic Details
Published in:Monthly weather review 2010-11, Vol.138 (11), p.4212-4228
Main Authors: MIROCHA, J. D, LUNDQUIST, J. K, KOSOVIC, B
Format: Article
Language:English
Subjects:
Atmospheric boundary layer
Boundary layer flow
Boundary layers
Computational fluid dynamics
Computer simulation
Damping
Earth, ocean, space
Energy
Exact sciences and technology
External geophysics
Finite element method
Flow control
Flow separation
Flow simulation
Fluid flow
Kinetic energy
Large eddy simulation
Large eddy simulations
Marine
Mathematical models
Meteorology
Modelling
Nonlinearity
Oceanic eddies
R&D
Research & development
Simulation
Stresses
Turbulence
Turbulent flow
Viscosity
Vortices
Weather forecasting
Wind stress
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Summary:Two formulations of a nonlinear turbulence subfilter-scale (SFS) stress model were implemented into the Advanced Research Weather Research and Forecasting model (ARW-WRF) version 3.0 for improved large-eddy simulation performance. The new models were evaluated against the WRF model’s standard Smagorinsky and 1.5-order turbulence kinetic energy (TKE) linear eddy-viscosity SFS stress models in simulations of geostrophically forced, neutral boundary layer flow over both flat terrain and a shallow, symmetric transverse ridge. Comparisons of simulation results with similarity profiles indicate that the nonlinear models significantly improve agreement with the expected profiles near the surface, reducing the overprediction of near-surface stress characteristic of linear eddy-viscosity models with no near-wall damping. Comparisons of simulations conducted using different mesh sizes indicate that the nonlinear model simulations at coarser resolutions agree more closely with the higher-resolution results than corresponding lower-resolution simulations using the standard WRF SFS stress models. The nonlinear models produced flows featuring a broader range of eddy sizes, with less spectral power at lower frequencies and more spectral power at higher frequencies. In simulated flow over the transverse ridge, distributions of flow separation and reversal near the surface simulated at higher resolution were likewise better depicted in coarser-resolution simulations using the nonlinear models.
ISSN:0027-0644
1520-0493
DOI:10.1175/2010mwr3286.1