Simulation of Flow Around a Finite Rectangular Prism: Influence of Mesh, Model, and Subgrid Length Scale [PDF]
EntropyThis study investigates the flow field around a finite rectangular prism using both experimental and computational methods, with a particular focus on the influence of the turbulence approach adopted, the mesh resolution employed, and different subgrid ...
Xutong Zhang +4 more
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Rational subgrid-scale modelling: a short survey
Theoretical and Applied Mechanics Letters, 2018 : We review the previous attempts of rational subgrid-scale (SGS) modelling by employing the Kolmogorov equation of filtered quantities. Aiming at explaining and solving the underlying problems in these models, we also introduce the recent methodological
L. Fang, L.P. Lu
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Synchronizing subgrid scale models of turbulence to data [PDF]
Physics of Fluids, 2020 Large eddy simulations of turbulent flows are powerful tools used in many engineering and geophysical settings. Choosing the right value of the free parameters for their subgrid scale models is a crucial task for which the current methods present several shortcomings. Using a technique called nudging, we show that large eddy simulations can synchronize
Michele Buzzicotti +1 more
exaly +4 more sources
An improved subgrid channel model with upwind-form artificial diffusion for river hydrodynamics and floodplain inundation simulation [PDF]
Geoscientific Model Development, 2023 An accurate estimation of river channel conveyance capacity and the water exchange at the river–floodplain interfaces is pivotal for flood modelling.
Y. Rong, P. Bates, J. Neal
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Deep learning subgrid-scale parametrisations for short-term forecasting of sea-ice dynamics with a Maxwell elasto-brittle rheology [PDF]
The Cryosphere, 2023 We introduce a proof of concept to parametrise the unresolved subgrid scale of sea-ice dynamics with deep learning techniques. Instead of parametrising single processes, a single neural network is trained to correct all model variables at the same time ...
T. S. Finn +7 more
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Simulations of idealised 3D atmospheric flows on terrestrial planets using LFRic-Atmosphere [PDF]
Geoscientific Model Development, 2023 We demonstrate that LFRic-Atmosphere, a model built using the Met Office's GungHo dynamical core, is able to reproduce idealised large-scale atmospheric circulation patterns specified by several widely used benchmark recipes.
D. E. Sergeev +16 more
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Effects of multi-scale heterogeneity on the simulated evolution of ice-rich permafrost lowlands under a warming climate [PDF]
The Cryosphere, 2021 In continuous permafrost lowlands, thawing of ice-rich deposits and melting of massive ground ice lead to abrupt landscape changes called thermokarst, which have widespread consequences on the thermal, hydrological, and biogeochemical state of the ...
J. Nitzbon +10 more
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Satellite-retrieved sea ice concentration uncertainty and its effect on modelling wave evolution in marginal ice zones [PDF]
The Cryosphere, 2020 Ocean surface waves are known to decay when they interact with sea ice. Wave–ice models implemented in a spectral wave model, e.g. WAVEWATCH III® (WW3), derive the attenuation coefficient based on several different model ice types, i.e.
T. Nose, T. Waseda, T. Kodaira, J. Inoue
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A Dynamic Mixed Model for General Circulation Models
Meteorologische Zeitschrift, 2023 An extension of the dynamic Smgarorinsky model (DSM) is presented. In the so-called dynamic mixed model (DMM), the Leonard stress (i.e., the resolved part of the Reynolds stress) is no longer parameterized in the test filter range by the Smagorinsky ...
Urs Schaefer-Rolffs
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A Priori Validation of Subgrid-scale Models for Astrophysical Turbulence [PDF]
The Astrophysical Journal, 2020 Abstract We perform a priori validation tests of subgrid-scale (SGS) models for the turbulent transport of momentum, energy, and passive scalars. To this end, we conduct two sets of high-resolution hydrodynamical simulations with a Lagrangian code: an isothermal turbulent box with rms Mach numbers of 0.3, 2, and 8, and the classical wind
Chia-Yu 瑜 Hu 胡家 +1 more
openaire +3 more sources