Extension of the Eddy Dissipation Concept for Improved Low-Cost Turbulence-Chemistry Interaction Modeling

The one CFD modeling area that has remained the most challenging, yet most critical to the success of integrated propulsion system simulations, is turbulence modeling. There is a need to develop mid-level CFD models for the interaction of turbulence and chemical reactions that give superior results to the simple models (e.g., Magnussen's Eddy Dissipation Concept), but which do not require the large computational expense of the very complex models (e.g., PDF evolution methods or the Linear Eddy Method). This SBIR program proposes to develop this capability by extending the Eddy Dissipation Concept of Magnussen (EDC) to allow for improved modeling of reacting flows?especially diffusion flames where the flow contains significant regions of mixing prior to combustion. In Phase I, the proposed approach will be demonstrated using a Magnussen model with a global one-step reaction mechanism. The effect of the modified model on the predicted combustion relative to the original Magnussen EDC will be demonstrated on a test case.