Modelling of Stably Stratified Atmospheric Boundary Layers with Varying Stratifications

QC 20201217
A recently developed explicit algebraic Reynolds-stress (EARS) model is validated for an idealized representation of the night-time high-latitude stably stratified atmospheric boundary layer. The simulations are made with four surface cooling rates that result in weakly to moderately stratified stable boundary layers. The predictions of the EARS model are compared to high-resolution large-eddy simulations (LES) of Sullivan et al. (J Atmos Sci 73(4):1815–1840, 2016). First- and second-order statistics are shown to be well predicted by the EARS model. The EARS model also predicts the horizontal turbulent fluxes and turbulence anisotropy and these compare well with the LES results. The sensitivity to the model coefficients is studied by comparing the EARS model results with LES results. Finally, we propose a new scaling for the production of turbulence kinetic energy and show that the EARS model captures the essential trends of the LES results for different cooling rates.

TEKNIK OCH TEKNOLOGIER Maskinteknik Strömningsmekanik och akustik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Fluid Mechanics and Acoustics hsv//eng
GABLS1
Reynolds-stress model
Scaling law
Stably stratified atmosphere
Turbulence parametrization
Atmospheric movements
Atmospheric thermodynamics
Boundary layer flow
Cooling
Horizontal wells
Kinetic energy
Kinetics
Large eddy simulation
Reynolds number
Turbulence
High resolution
Model coefficient
Reynolds stress
Second order statistics
Stable boundary layer
Surface cooling
Turbulence anisotropy
Turbulence kinetic energy
Atmospheric boundary layer
boundary layer
computer simulation
numerical model
stratified flow
turbulent flow

Brethouwer, GertKTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre(Swepub:kth)u1wv2s66 (författare)
Wallin, StefanKTH,Linné Flow Center, FLOW,Mekanik(Swepub:kth)u1g8s32s (författare)
Johansson, Arne V.,1953-KTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre(Swepub:kth)u1r4nbk6 (författare)
KTHLinné Flow Center, FLOW (creator_code:org_t)

Av författaren/redakt...: Zeli, Velibor; Brethouwer, Gert; Wallin, Stefan; Johansson, Arne ...

Om ämnet

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Strömningsmekani ...

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