NORMALIZATION BASED ON THE ACTIVE MOTION IN A TURBULENT BOUNDARY-LAYER

A comparison between the inner regions of self-preserving turbulent bo undary layers over an impervious wall and a porous surface with a unif orm moderate suction rate indicates that, in each case, the relevant v elocity and length scales are those of the ''active'' motion. There is close agreement between the two flows for velocity and temperature va riances and longitudinal heat fluxes when the measurements are conditi oned on only the negative part of the Reynolds shear stress and are no rmalized by the scales of the active motion