Simulace turbulence v konvektivní mezní vrstvě atmosféry

Hostačný, Martin

Name: Simulation of turbulence in the convective planetary boundary layer Autor: Martin Hostačný Department: Department of atmospheric physics Supervisor: Mgr. Vladimír Fuka, Ph.D. Abstract: Airflow convection is simulated in four model cases using a Large Eddy Simulation (LES) model. The first case features flat heated surface which causes free convection into a neutrally- stratified atmosphere. The goal of simulating the first case is a comparison with reference Direct Numerical Simulation (DNS) data. The main aim is to compare the LES and DNS approaches to the numerical simulation of the problem. The second case consists of a stable convective boundary layer over a flat heated surface. The resulting simulation is a convective motion. The aim is to qualitatively judge the influence of the numerical grid density and the choice of the subgrid model on the convection. The third case is a convection over a flat heated surface which is divided into four equally large quadrants. Two of the quadrants have higher surface potential temperature flux and two have a lower one. The quadrants are arranged in a checkerboard manner. The aim is to observe differences between the simulations with different subgrid models and also to observe and identify trends and recurring airflow patterns caused by the surface...

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