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SIMULATING THE EFFECTS OF UPSTREAM TURBULENCE ON DISPERSION AROUND A BUILDING
Citation:
Zhang, Y., S. Arya, A. Huber, AND W. Snyder. SIMULATING THE EFFECTS OF UPSTREAM TURBULENCE ON DISPERSION AROUND A BUILDING. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/228 (NTIS PB93119881).
Description:
The effects of high turbulence versus no turbulence in a sheared boundary-layer flow approaching a building are being investigated by a turbulent kinetic energy/dissipation (k-e) model (TEMPEST). The effects on both the mean flow and the concentration field around a cubical building are presented. he numerical simulations demonstrate significant effects due to the differences in the incident flow. he addition of upstream turbulence results in a reduced size of the cavity directly behind the building. he velocity deficits in the wake strongly depend on the upstream turbulence intensities. he accuracy of numerical simulations is verified by comparing the predicted mean flow and concentration fields with the wind tunnel measurements of Castro and Robins (1977) and Robins and Castro (1977, 1975). omparing our results with experimental data, we show that the TEMPEST model can reasonably simulate the mean flow. he numerical simulations of the concentration fields due to a source on the roof-top of the building are presented. oth the value and the position of the maximum ground-level concentration are changed dramatically due to the effects of the upstream level of turbulence.