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DY: Fachverband Dynamik und Statistische Physik

DY 16: Convection

DY 16.3: Vortrag

Montag, 16. März 2020, 16:00–16:15, ZEU 147

Moist Rayleigh-Bérnard Convection in conditionally unstable environments — •Florian Heyder, Jörg Schumacher und Martina Hentschel — Technische Universität Ilmenau, 98693 Ilmenau, Germany

The presence of water vapour and liquid water leads to cloud formation in the turbulent atmosphere. The boost of buoyancy due to latent heat release by condensation at cloud level implies different dynamics for dry unsaturated and moist saturated air parcels. We investigate their motion by direct numerical simulations in a moist Rayleigh-Bénard (RB) model in the Boussinesq approximation. Our setup takes moist and dry dynamics into account by linearising the equation of state on both sides of the phase boundary. This simplified model allows us to study differences to classical RB systems without phase changes, as well as the formation of clouds in extended horizontal domains. Special emphasis is given to conditionally unstable environments where dry air is stably and moist air unstably stratified.