Learning the structure of wind: A data-driven nonlocal turbulence model for the atmospheric boundary layer

We develop a novel data-driven approach to modeling the atmospheric boundary layer. This approach leads to a nonlocal, anisotropic synthetic turbulence model which we refer to as the deep rapid distortion (DRD) model. Our approach relies on an operator regression problem that characterizes the best...

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Veröffentlicht in:Physics of fluids (1994) 2021-09, Vol.33 (9)
Hauptverfasser: Keith, B., Khristenko, U., Wohlmuth, B.
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container_issue 9
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container_title Physics of fluids (1994)
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creator Keith, B.
Khristenko, U.
Wohlmuth, B.
description We develop a novel data-driven approach to modeling the atmospheric boundary layer. This approach leads to a nonlocal, anisotropic synthetic turbulence model which we refer to as the deep rapid distortion (DRD) model. Our approach relies on an operator regression problem that characterizes the best fitting candidate in a general family of nonlocal covariance kernels parameterized in part by a neural network. This family of covariance kernels is expressed in Fourier space and is obtained from approximate solutions to the Navier–Stokes equations at very high Reynolds numbers. Each member of the family incorporates important physical properties such as mass conservation and a realistic energy cascade. The DRD model can be calibrated with noisy data from field experiments. After calibration, the model can be used to generate synthetic turbulent velocity fields. To this end, we provide a new numerical method based on domain decomposition which delivers scalable, memory-efficient turbulence generation with the DRD model as well as others. We demonstrate the robustness of our approach with both filtered and noisy data coming from the 1968 Air Force Cambridge Research Laboratory Kansas experiments. Using these data, we witness exceptional accuracy with the DRD model, especially when compared to the International Electrotechnical Commission standard.
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subjects Artificial neural networks
Atmospheric boundary layer
Atmospheric models
Computational fluid dynamics
Covariance
Domain decomposition methods
Fluid dynamics
Fluid flow
High Reynolds number
Kernels
Navier Stokes equations
Neural networks
Numerical methods
Physical properties
Physics
Robustness (mathematics)
Turbulence models
Turbulence simulations
Turbulence theory and modelling
Turbulent flows
Velocity distribution
WIND ENERGY
title Learning the structure of wind: A data-driven nonlocal turbulence model for the atmospheric boundary layer
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