Simulation of Wind Direction Fluctuation in the Diffusion Wind Tunnel with Overlapping Technique

Abstract

The diffusion wind tunnl is wellknown very useful to predict pollutant gas concentrations released from continuous sources in the complex terrain and the similarity law for atmospheric diffusion entails turbulent simulation of wind direction fluctuation, σ_A observed over the concentration averaging time in the wind tunnel.
The new concentration overlapping technique with use of the turntable in the wind tunnel working section is here developed and shown useful to simulate high wind direction fluctuation which is beyond the convetional turbulence generators or wind oscillators.