Experimental Investigations of the Turbulent Mixing Process and theReynolds-Stress Anisotropy Tensor in Ventilated Rooms

In the past various experimental investigationsabout room airflows were published. But mostinvestigations are limited regardingmeasurement positions (restricted flow pattern)and the availability of turbulent quantities(Reynolds-Stresses, entrainment, macroscopicinstabilities etc.). Based on the availableexperimental data a targeted improvement ofturbulence models is difficult. Therefore twodifferent room airflow situations wereinvestigated with three-dimensional ParticleImage Velocimetry. Detailed information of theflow, the Reynolds-stress distribution and theentrainment are presented. Furthermore stableand nonstable conditions and nonsymmetricaleffects are shown. Based on the results thebehaviour of RANS-based turbulence models inpredicting room airflows is discussed.