Micromixing modelling of mean and fluctuating scalar fields in the convective boundary layer

摘要: Coupling the concepts of Lagrangian marked-particle approach and interaction-by-exchange-with-the-conditional-mean (IECM) micromixing approach, a model is developed to calculate mean fluctuating scalar fields generated by fluxes emitted into convective boundary layer (CBL) from continuous area sources located at top bottom CBL. A source simulated as superposition series instantaneous sources. The due are represented sum top-down bottom-up components with their cross-correlations included, mixed-layer similarity used for normalising quantities. mixing time scale parameterised linear function time. model-derived profile functions terms can be derive concentration moments any value ratio entrainment flux surface flux, including cases where material extracted (i.e. sinks). Model results on gradients; functions; (temperature humidity) variances, skewness kurtosis discussed; compared large-eddy simulation field laboratory data available. comparison shows good performance model, considering fact that minimal flow information variance third moment vertical turbulent velocity, kinetic energy dissipation rate) in form profiles.