Experimental and CFD modelling of indoor air and wake flow from a moving manikin

The effect of human motion on wake flow dynamics and particle dispersion were investigated by experimental visualisation and Computational Fluid Dynamics (CFD) modelling using a mannequin model with realistic human shape. A new smoke visualisation technique is proposed which made use of the chemical reaction between acetic acid and cyclohexylamine. The CFD model used a dynamic mesh to simulate the moving manikin, and the Lagrangian particle tracking for particle dispersion originating from the floor. The results showed the moving manikin sheared the stagnant air and entrained flow, inducing a wake that gathered momentum as the manikin moved forwards. Using the smoke visualisation technique, we were able visualise the trailing smoke passing over the manikin which had come to a stop. The passing wake enhanced inhalation exposure as it has potential to re-disperse particles into the breathing region.