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Growth of Turbulent Boundary Layer with Varying Inlet ‎Length Scales‎
Author(s): YoungTae LEE, HeeChang LIM
Keywords: Statistical inflow data; Synthetic inflow generator; Integral length scale; Channel flow; Turbulent ‎boundary layer; CFD.
This study aims to generate a fully developed turbulent boundary layer in the channel domain using ‎LES (Large Eddy Simulation), suitable inflow conditions along with statistically reliable turbulent ‎characteristics are required. This study clarifies the effect of the integral length scale from the ‎existing data on the generation of turbulent boundary layers. In order to justify the work, an ‎artificially created boundary layer is imposed on the inlet section, which gradually evolves into a ‎fully developed turbulent boundary layer flow inside the numerical domain. In this study, the ‎synthetic inflow method, which is based on an exponential correlation function, is used by ‎imposing the spatial and temporal correlation between two different points on the inlet section. In ‎addition, we conducted parametric length scale studies on the inlet section and compare our results ‎with existing data. The results indicated that the cases of larger length scale in the span-wise ‎direction were not only effective in achieving the target shape of a fully developed turbulent ‎boundary layer, but also developed it faster than the smaller-length scales.‎

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.