Eric R. Pardyjak

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The TPAWT adds a wind display system to the previously developed Treadport virtual environment, and this research builds upon prior work to provide improved control of headwind angle at the user position. Key to this research is the addition of a negative pressure plenum at the rear of the treadport to improve nominal flow stability. The previous controller(More)
This paper describes development of a wind display system for the TreadPort virtual environment locomotion interface, which is cumulatively known as the TreadPort Active Wind Tunnel (TPAWT). Computational Fluid Dynamic simulations and experiments with a scaled model test-bed of the system has resulted in a combination of passive and active controls capable(More)
This paper presents the Treadport Active Wind Tunnel (TPAWT)-a full-body immersive virtual environment for the Treadport locomotion interface designed for generating wind on a user from any frontal direction at speeds up to 20 kph. The goal is to simulate the experience of realistic wind while walking in an outdoor virtual environment. A recirculating-type(More)
NARRATIVE SUMMARY Dust generated from the mechanical disturbance of granular material is known as " fugitive dust " since it is not released into the atmosphere in a restricted flow stream such as an exhaust pipe or smoke stack. Fugitive dust includes dust from unpaved roads, disturbed land in developed areas, agriculture, and undeveloped grazing land.(More)
A simple model to study the decay of turbulent kinetic energy (TKE) in the convective surface layer is presented. In this model, the TKE is dependent upon two terms, the turbulent dissipation rate and the surface buoyancy fluctuations. The time evolution of the surface sensible heat flux is modelled based on fitting functions of actual measurements from the(More)
An inversion technique comprising stochastic search and regularized gradient optimization was developed to solve the atmospheric source characterization problem. The inverse problem comprises retrieving the spatial coordinates, source strength, and the wind speed and wind direction at the source, given certain receptor locations and concentration values at(More)