DNS and LES for simulating stratocumulus: Better together
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hdl:2117/179797
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Data publicació2018-07-05
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Abstract
We argue that combining direct numerical simulation (DNS) with large-eddy simulation
(LES) and field studies could accelerate current lines of stratocumulus research. LES allows for a faster
and more holistic study of the parameter space, but LES is sensitive to details of its formulation because
the energetics are tied to unresolved processes in the cloud top region. One way to assess this sensitivity
is through field studies. Another way is through DNS. In particular, DNS can be used to test the hypothesis
that LES, even with an inadequate representation of the physics of cloud top entrainment, properly
quantifies the sensitivity of cloud-topped boundary layers to changing environmental conditions.
We support this argument by contrasting theoretical aspects of both techniques, by presenting first DNS
results of a stratocumulus-topped boundary layer and discussing their convergence toward Reynolds
number similarity, and by showing the consistency of DNS results with LES results and field measurements.
CitacióMellado, J. P. [et al.]. DNS and LES for simulating stratocumulus: Better together. "Journal of Advances in Modeling Earth Systems", 5 Juliol 2018, vol. 10, p. 1421-1438.
ISSN1942-2466
Versió de l'editorhttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018MS001312
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