Abstract
Prediction of growth and persistence of aircraft condensation trails involves uncertainties arising from numerous factors. It is sensitive to the atmospheric thermodynamic variables. Ambient relative humidity (RH) and temperature are themselves dicult to predict accurately, and they also aect the contrail growth. This study carries out Large Eddy Simulations (LES) of aircraft wake-contrail system to find the sensitivity of contrails to atmospheric conditions. A mixed Eulerian-Lagrangian approach is used to simulate the wake-jet flow and ice particle evolution. The microphysics model used is described. Unsaturated, saturated, and supersaturated atmospheric conditions are studied. Quantitative comparison for total ice amount and particle statistics is presented for various values of ambient temperature, RH, and jet exhaust temperature. The focus is on early stage (up to 15sec) ice particle growth of a typical subsonic transport aircraft.
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