Turbulent Pressure Statistics in the Atmospheric Boundary Layer from LargeEddy Simulation
Abstract
We use largeeddy simulation (LES) to study the turbulent pressure field in atmospheric boundary layers with free convection, forced convection, and stable stratification. We use the Poisson equation for pressure to represent the pressure field as the sum of meanshear, turbulenceturbulence, subfilterscale, Coriolis, and buoyancy contributions. We isolate these contributions and study them separately. We find that in the energycontaining range in the freeconvection case the turbulenceturbulence pressure dominates over the entire boundary layer. That part dominates also up to midlayer in the forcedconvection case; above that the meanshear pressure dominates. In the stable case the meanshear pressure dominates over the entire boundary layer.We find evidence of an inertial subrange in the pressure spectrum in the free and forcedconvection cases; it is dominated by the turbulenceturbulence pressure and has a threedimensional spectral constant of about 4.0. This agrees well with quasiGaussian predictions but is a factor of 2 less than recent results from direct numerical simulations at moderate Reynolds numbers. Measurements of the inertial subrange pressure spectral constant at high Reynolds numbers, which might now be possible, would be most useful.
 Publication:

BoundaryLayer Meteorology
 Pub Date:
 2004
 DOI:
 10.1023/B:BOUN.0000039377.36809.1d
 Bibcode:
 2004BoLMe.113..161M