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Session: Atmospheric turbulence 2
Session starts: Tuesday 25 August, 15:00
Presentation starts: 15:30
Room: Room C

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Kanwar Nain Singh (Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India)
Sreenivas K.R. (Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India)

Abstract:
Clouds are one of the major sources of uncertainty in climate prediction .The present work is to study the dynamics of orographic clouds. We considered a planar turbulent wall jet with off source volumetric heating as an appropriate low order fluid-dynamical model for studying the turbulence and entrainment in orographic-clouds. Entrainment was found to reduce drastically with the off-source volumetric heat addition. We found that the reduction of entrainment started at a bulk-Richardson number which was an order of magnitude smaller than that seen in earlier experiments [1] on free standing cumulus clouds. This is consistent with observations in real orographic clouds which develop as a thin sheet rising along the mountain slope. We have developed a novel scanning tomography technique for getting concentration field in turbulent shear flows. This technique is being applied on cloud-like flow to understand the entrainment characteristics. Detailed results will be presented at the conference.