Compression Ignition Engine Technology Insertion

Not Available The objective of this Small business Innovation Research Phase I project is to devise accurate techniques for predicting turbulent mixing with a view toward estimating the effectiveness of strategies for neutralizing bio/chem hazards. Recent, substantial progress by Krispin Technologies, Inc., in developing 3D vortex methods for turbulent flow simulation as part of a DOE supported SBIR Phase II project will be leveraged to yield immediate application to realistic hazard scenarios of interest to DTRA. Among these are scalar plumes emanating from multiple sites within confined or open air domains. The unique capabilities of vortex methods derive from the versatility of their grid-free character; their computational speed; and, their capacity to represent essential physical properties of turbulent flow. In particular, they are better positioned to model the essential effect of small scale vortices on scalar mixing than traditional grid-based closure and large eddy simulation techniques relying on unphysical diffusive models. The accuracy of the proposed methodology will be tested for scalar plumes in atmospheric flows under a variety of conditions as well as for turbulent jets. Subsequently, methods for quantifying mixing between species will be devised and then applied to problems for which scalars originate from separate sources. The proposed new technology is important to DTRA interests and is applicable to a broad range of DTRA and defense applications. It can be readily adapted for civilian use; it can be utilized for better analysis and control of numerous industrial activities, ranging from chemical to energy applications, natural and industrial pollution, and other health hazards.