Direct numerical simulation of laminarization in the atmospheric boundary layer

Judith M.M. Donda, B. J.H. van de Wiel, G. J.F. van Heijst, H. J.J. Clercx

Research output: Contribution to conferencePaper

Abstract

A well-known phenomenon in the atmospheric boundary layer is the facts that winds may become very weak in the evening after a clear sunny day. In these quiet conditions usually hardly any turbulence is present. Consequently, this type of boundary layer is referred to as the quasi-laminar boundary layer. In spite of its omnipresence, the appearance of the laminar boundary layer is poorly understood and forms a long-standing problem in meteorological research. In the present study we investigate an analogue problem in the form of a stably stratified channel flow. The flow is studied by using direct numerical simulations (DNS). Simulations reveal that flow laminarization occurs when the normalized surface heat extraction h/L is larger than 1.23. In a companioning study this laminarisation is explained by the maximum sustainable heat flux theory (MSHF), which will be validated in the present research.

Original languageEnglish
Publication statusPublished - 2020
Event14th European Turbulence Conference, ETC 2013 - Lyon, France
Duration: 1 Sep 20134 Sep 2013

Conference

Conference14th European Turbulence Conference, ETC 2013
CountryFrance
CityLyon
Period1/09/134/09/13

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