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Comments on the present state and future directions of PDF methodsThe one point probability density function (PDF) method is examined in light of its use in actual engineering problems. The PDF method, although relatively complicated, appears to be the only format available to handle the nonlinear stochastic difficulties caused by typical reaction kinetics. Turbulence modeling, if it is to play a central role in combustion modeling, has to be integrated with the chemistry in a way which produces accurate numerical solutions to combustion problems. It is questionable whether the development of turbulent models in isolation from the peculiar statistics of reactant concentrations is a fruitful line of development as far as propulsion is concerned. There are three issues for which additional viewgraphs are prepared: the one point pdf method; the amplitude mapping closure; and a hybrid strategy for replacing a full two point pdf treatment of reacting flows by a single point pdf and correlation functions. An appeal is made for the establishment of an adequate data base for compressible flow with reactions for Mach numbers of unity or higher.
Document ID
Document Type
Conference Paper
Obrien, E. E.
(State Univ. of New York Stony Brook, NY, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1992
Publication Information
Publication: NASA. Lewis Research Center, Workshop on Engineering Turbulence Modeling
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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