A direct numerical simulation of a stratified boundary layer under various stable conditions is made by a finite-difference method without any turbulence model. The numerical simulation is very successful, showing variations of turbulent quantities due to thermal stratification. Namely, the intensities and fluxes of velocity and temperature fluctuations are significantly suppressed with increasing stability similar to the experimental results. Flow visualization of computational results is very useful to understand changes in the flow structure under stable stratification. However, compared with experimental results, the discrepancies in turbulence structure in the lowest part of the boundary layer (especially for z/δ < 0.2, δ is the boundary layer thickness) are observed.
|ジャーナル||Journal of Wind Engineering and Industrial Aerodynamics|
|出版ステータス||出版済み - 1997|
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