Wake and diffusion structure behind a model industrial complex. Technical report

The mean velocity, turbulence intensity and turbulent diffusion behind a model of the EOCR complex deeply submerged in a neutral turbulent boundary layer, have been investigated using wind tunnel tests and mathematical analysis. The effects of the momentum-type wake behind a complex are to decrease mean velocity and increase turbulence intensity. The complex geometry breaks down the horseshoe vortices, which consequently do not play an important role in determining wake characteristics. The decay rate of mean velocity defect was smaller than that of turbulence intensity excess variance. The wake was detected at a distance of x/H equal to 35 at a 5 percent mean velocity defect level. Such long wake regions are associated with the low roughness characteristics of the site. The vertical profiles of velocity defect and maximum velocity defect rates compared very well with the analytical predictions except at y/H=-0.67. The experimental measurements of the decay rate of turbulent intensity excess variance also compared very well with that predicted by the theory. The ground-level concentration compared satisfactorily with the perturbation theory