14th Symposium on Boundary Layer and Turbulence

P4.15

Evaluation of the drag coefficient for the Convective Boundary Layer

Dino Zardi, University of Trento, Trento, Italy; and D. Rossi

Suitable drag (CD) and heat transfer (CH) coefficients for bulk flow modelling of an inversion capped convective boundary layer are evaluated for different values of boundary layer thickness Y, ground roughness z0 and Obukhov length L. On the basis of vertical velocity profiles proposed by Kader & Yaglom (1990) an implicit equation for CD and CH is derived. Data resulting from numerical solution are conveniently fitted by interpolating formulae relating the coefficients with the bulk Richardson number RiB and a nondimensional ground roughnes z0/Y. Results are compared with previous formulations by other Authors.

Poster Session 4, Convective
Wednesday, 9 August 2000, 6:00 PM-9:00 PM

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