An aircraft turbulence encounter over the Drake Passage is investigated by combining unique high-frequency flight level data, vertical profiles of a near-simultaneous radiosonde profile and numerical results from global regional weather prediction (NWP) models. Meteorological analysis reveals an intense polar low propagating Bellinghausen Sea toward Passage. A small deep stratospheric intrusion...

In this report, experimentsmimicking some aspects of cloud-clear-air mixing in a laboratory chamber are discussed. A saturated plume containing small droplets of water (a surrogate of an atmospheric cloud) is mixedwith unsaturated environmental air in order to study effect of evaporative cooling at the interfaces between cloudy and clear air filaments on small-scale turbulence. Two components o...

Evaluation of Various Turbulence Models in Predicting Airflow and 1 Turbulence in Enclosed Environments by CFD: Part-1: 2 Summary of Prevalent Turbulence Models 3 4 Zhiqiang Zhai Zhao Zhang Wei Zhang Qingyan Chen 5 Member ASHRAE Student Member ASHRAE Member ASHRAE Fellow ASHRAE 6 7 Air distributions in enclosed environments are crucial to thermal comfort and air quality. 8 Computational fluid d...

The implementation of variable artificial roughness patterns on a surface is an effective technique to enhance the rate of heat transfer to fluid flow in the ducts of solar air heaters. Different geometries of roughness elements investigated have demonstrated the pivotal role that vortices and associated turbulence have on the heat transfer characteristics of solar air heater ducts by increasin...

With the growth of commercial aviation over the last few decades there have been many applications designed to improve the efficiency of flight operations as well as safety and security. A number of these applications are based on the gathered data from flights; the data is usually acquired from the various sensors available on the aircraft. There are numerous sensors among the electrical and e...

A clear air turbulence (CAT) occurred on 30 December 2020 over Tokyo, Japan. The CAT was largely generated by breaking Kelvin-Helmholtz (KH) instability waves in the free atmosphere. regional numerical weather prediction model simulated event with fine resolution (35 m). Onboard-recorded flight data and a simulation were utilized to validate meteorological simulation. locations of reproduced st...

In addition to low-level windshear (below 1600 feet), low-level turbulence could also adversely affect arriving/departing aircraft at the airport. Turbulent airflow may occur in clear-air/non-rainy weather conditions, e.g. terrain effect at the Hong Kong International Airport (HKIA) or building’s disruptions at Haneda Airport (Tokyo International Airport) in Japan. Such airflow disturbances cou...