APPROPRIATE BOUNDARY-CONDITIONS FOR COMPUTATIONAL WIND ENGINEERING MODELS USING THE KAPPA-EPSILON TURBULENCE MODEL

In computational models of wind engineering problems within die atmosp heric surface layer the approach flow should normally be modelled as a homogeneous flow. Velocity and turbulence profiles associated with th e k-epsilon turbulence model are proposed which produce homogeneous co nditions. These equations are discussed in the light of full-scale mea surements at Silsoe using sonic anemometers. It is suggested that the model constants k = 0.42, C(mu) = 0.013 and sigma(epsilon) = 3.22 more closely match the data obtained. It is also shown that the cospectrum for the Reynolds stress exhibits a characteristic frequency n(o) almo st-equal-to u/z which is consistent with the suggested profile equati ons.