Author(s)

R. Cieszelski

Abstract

It is shown that the life cycle structure of helical vortices in grid-point mod- elling is improved if two-scale energy and helicity conservation is taken into account. For the large-scale regime the 'Ansatz' of Lautenschlager et.al [6] is adopted and for the subgrid turbulence regime prognostic equations of turbulent kinetic energy TKE and of turbulent helicity TH (TKEH model) are solved. Cieszelski [1] showed that grid point modelling with the closed equation set preserves the stabilizing effects of helicity of spectral models. The resulting effects on multi-scale diffusion of pollutants is discussed. 1 Introduction A problem in grid point modelling arises with the transport of energy as well as passive and reactive pollutants by hel

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