boundary layer

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Related to Convective boundary layer: Planetary boundary layer

boundary layer

In fluidics, a narrow region next to a fixed boundary or surface where the fluid velocity rapidly changes from zero to some finite value.

boundary layer

microscopic layer of fluid (liquid or gas) next to the surface of a body or object moving relative to it, important in considering the drag force upon the object. laminar boundary layer layer which is next to the surface of an object, not mixing with the flow further away from the surface, and so can be considered to be a discrete layer in a plane parallel to the main flow. turbulent boundary layer layer which is next to the surface of an object, but in this case mixing with the flow further away from it. An example of a boundary layer change is that due to a dimpled golf ball in flight: the dimples make the boundary layer turbulent, which reduces drag caused by the pressure being lower behind the ball, so less energy is lost to the flow.
References in periodicals archive ?
classical convective boundary layers are formed Monin-Obukhov length scale is equal to -8 m.
2001) has indicated that this boundary layer scheme gives better results in representing convective boundary layers than the ones that account only with the local approach.
In recent years, some mass-flux parameterizations have been applied to the dry convective boundary layer (e.
Siebesma and Teixeira (2000) proposed a way of unifying the parameterization of the convective boundary layer, by combining eddy-diffusivity and mass-flux approaches, with a formulation based on similarity relations.
In Section 3, results from the ID model with the EDMF parameterization are compared against results from a Large Eddy Simulation (LES) model and from the ID model with the BL89 parameterization, for an idealized dry convective boundary layer case.
Siebesma and Teixeira (2000) showed that the mass-flux vertical profile in the convective boundary layer scales well with the standard deviation of the vertical velocity, [[sigma].
Siebesma and Cuijpers 1995) to simulate an idealized dry convective boundary layer evolution, based on the case of Nieuwstadt et al.
2004), the fractional entrainment rate [epsilon] was also obtained from LES results, considering the dry convective boundary layer case previously described (Nieuwstadt et al.
This new version of the EDMF approach based on TKE is tested for an idealized dry convective boundary layer case, similar to the one described above.
Kaimal, 1977: Vertical heat flux in the convective boundary layer.