ISSN:
1573-1472
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract The atmospheric surface layer model of Lewellen and Teske (1973) is extended. Obvious discrepancies between model results and empirical data suggest the use of improved closure schemes for the non-diffusive parts of the pressure-velocity correlations in the Reynolds stress equations. Subsequently a time scale for the surface layer, which is based on vertical velocity fluctuations, is tested by means of the extended model. Finally the extended model is optimized by variation of the diffusion parameters, and an additional equation is introduced for the dissipation rate of Reynolds stresses. Investigations show that the normalized mean velocity and temperature gradients are verified by all model versions favorably, whereas the other turbulence variables % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqaqpepeea0xe9qqVa0l% b9peea0lb9Lq-JfrVkFHe9peea0dXdarVe0Fb9pgea0xa9W8qr0-vr% 0-viWZqaceaabiGaciaacaqabeaadaqaaqaaaOqaamaanaaabaGaam% yDaGqaciaa-DcacaWFGaGaamyDaiaa-DcaaaGaaiilaiaabccadaqd% aaqaaiabew8a1jaa-DcacaWFGaGaeqyXduNaa83jaaaacaqGSaGaae% iiamaanaaabaGaae4Daiaa-DcajaaqcaWFGaGccaqG3bGaa83jaaaa% caqGSaGaaeiiamaanaaabaGaamyDaiaa-DcajaaqcaWFGaGccaWFub% Gaa83jaaaaaaa!4DB4!\[\overline {u' u'} ,{\rm{ }}\overline {\upsilon ' \upsilon '} {\rm{, }}\overline {{\rm{w}}' {\rm{w}}'} {\rm{, }}\overline {u' T'} \] and % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqaqpepeea0xe9qqVa0l% b9peea0lb9Lq-JfrVkFHe9peea0dXdarVe0Fb9pgea0xa9W8qr0-vr% 0-viWZqaceaabiGaciaacaqabeaadaqaaqaaaOqaaGqaciaa-rfaca% WFNaqcaaKaa8hiaOGaa8hvaiaa-Dcaaaa!3BB8!\[T' T'\] cannot be simulated so easily. Complications especially arise in unstable temperature stratification.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00118613
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