in literature. However most investigations of PBL turbulence focus
on momentum dynamics, partly because velocity is easier to measure
compared to vorticity and also because large-eddy and direct numerical
simulations typically use the momentum-pressure formulation.
In this work we pose the following questions: What are the
vorticity dynamics in the PBL and how does vorticity dynamics contribute to
turbulent transport? We use a new large-eddy simulation (LES) code
that is based on the vector-vorticity model developed by Jung and
Arakawa (2008) to investigate vorticity dynamics in the atmospheric
PBLs. The model solves vorticity equations instead of the usual
momentum equations; its output consists of all three components
of vorticity, as well as the velocity field. We use the model
to perform an LES of a convective PBL with mean shear and analyze
vortical structures that contribute to transport and
Reynolds stress in the PBL.
Jung, J.-H. and A. Arakawa, 2008: A three-dimensional anelastic model
based on the vorticity equation. Mon. Wea. Rev., 136, 276-294.