A flow regime diagram for forecasting lee waves, rotors and downslope winds

A flow regime diagram for forecasting lee waves, rotors and downslope winds

The influence of a strong low-level temperature inversion on the occurrence of lee waves, rotors and hydraulic jumps has been investigated using high resolution numerical model simulations. The aim of the work is to develop tools for forecasting hazardous winds downstream of mountains. Two-dimensional simulations were conducted for a range of inversion heights and strengths and a fixed hill sha...

A new theory for downslope windstorms and trapped mountain waves

Mountain gravity wave theories often neglect the observationnal evidence that the large scale winds can become very small near the earth surface. This common shortcoming is related to the fact that mountain waves have a critical level near the surface in this case, making the problem extremely involved. We briefly expose here how Lott (2016) circumvents this difficulty and derive a theory where...

Flow Seals Parameters Analysis For Rotors

The interaction of work fluid mechanics with that of the rotary system itself, basically composed of axes, bearings and rotors, is performed by inserting equivalent dynamic coefficients in the mathematical model of the rotor, the latter being obtained by the finite element method. In this paper, the dynamic coefficients of inertia, stiffness and damping of the flat seals analyzed here are evalu...

Lee waves from a sphere in a stratified flow

Recent Developments in the Theory of Atmospheric Rotors

MARCH 2004 AMERICAN METEOROLOGICAL SOCIETY | he Sierra Nevada Range is one of the most prominent and steepest mountain barriers in the United States and, not surprisingly, is a well-known location for a multitude of topographically forced atmospheric phenomena. As the prevailing westerly winds pass over the Sierra Nevada, gravity waves are frequently generated. Occasionally these mountain waves...