Simulation of Turbulent Flow and Complex Chemistry by Local Integral Moment (LIM) Modeling

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Title Simulation of Turbulent Flow and Complex Chemistry by Local Integral Moment (LIM) Modeling
Creator Dahm, Werner J.A.; Tryggvason, Gretar; Kezerle, James A.; Serauskas, Robert V.
Publisher Digitized by J. Willard Marriott Library, University of Utah
Date 1995
Spatial Coverage presented at Monterey, California
Abstract A local integral moment (LIM) model is presented for simulations of gas combustion in turbulent flows. The LIM model, which is fundamentally different f rom existing codes, is based on the fact that molecular mixing processes in turbulent flows are concentrated on universal, self-similar, small-scale structures. The model incorporates this experimentally proven simplification through a local parabolization of the governing transport equations on the time-evolving material surface on which the gradients are concentrated. This leads to a closed set of equations governing the local integral moments along the layer-normal direction at each point on the surface, effectively trans forming the original partial differential equations to a set of ordinary differential equations that can be solved on a time-evolving surface. The scalar field constructed from the integral moments on this surface gives the chemical species fields via a strained diffusion and reaction layer formulation. Results from numerous test cases indicate that the LIM model allows accurate, relatively economical calculations of complex flows with complex chemistry.
Type Text
Format application/pdf
Language eng
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