Large-Eddy Simulations of Stratified Atmospheric Boundary Layers: Comparison of Different Subgrid Models

Gadde, S.N.; Stieren, A.; Stevens, R.J.A.M.

doi:10.1007/s10546-020-00570-5

Publication 80 · Atmospheric turbulence

Large-Eddy Simulations of Stratified Atmospheric Boundary Layers

S.N. Gadde, A. Stieren, R.J.A.M. Stevens, Bound.-Layer Meteorol. 178, 363–382 (2021).

Main finding

The paper gives useful within-code evidence that AMD can approximate LASD more closely than the chosen Smagorinsky implementation at lower reported cost. It is not an independent or closure-free validation, and it does not demonstrate heterogeneous-flow transfer or portable HPC superiority.

Mean velocity, shear stress, variance and gradient for three subgrid models in neutral flow — **How to read the figure.** Mean velocity against the log law (a), shear stress (b), vertical velocity variance (c) and the dimensionless velocity gradient (d) for three subgrid-scale closures in a neutral boundary layer. The anisotropic minimum-dissipation and Lagrangian scale-dependent models track the log law and each other; the Smagorinsky implementation departs from both. This is within-code evidence rather than an independent validation, and it does not show that the ordering carries over to heterogeneous flow. Open the full-resolution figure. Figure 1. S.N. Gadde et al. (2021). No separate licence is stated here; consult the original publication and credited source before reuse.

Why this matters

Unresolved turbulence must be modelled, and model choice changes simulated boundary-layer structure.

Research context

Large-eddy simulation study of the logarithmic law for second… is cited for LASD accuracy and log-layer evidence, while Effect of Coriolis force on a wind farm wake is cited as a prior LASD wind-farm application; both scientific uses remain distinct from this closure comparison. The method shares the Albertson–Parlange code family and rough-wall LES architecture later used across the ABL programme. Wall modeled immersed boundary method for high Reynolds number… is a related method paper but is not cited as a dependency here.

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