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Micromixing simulation by two-particle mixing

DOI: 10.1615/ICHMT.2015.THMT-15.940
pages 455-458

C. Dopazo
Area de Mecanica de Fluidos, Universidad de Zaragoza, Maria de Luna 3, 50018 Zaragoza, Spain

J. Hierro
Centro Universitario de la Defensa, Academia General Militar, Carretera de Huesca s/n, 50090 Zaragoza, Spain

L. Cifuentes
Area de Mecanica de Fluidos, Universidad de Zaragoza, Maria de Luna 3, 50018 Zaragoza, Spain

Jesus Martin
Area de Mecanica de Fluidos, Universidad de Zaragoza, Maria de Luna 3, 50018 Zaragoza, Spain

Résumé

In the modeling of processes of chemical reaction with turbulent mixing, pdf methods with a Monte Carlo representation treat exactly the chemical kinetics. However, a model is needed in these methods for micromixing. Linear Mean Square Estimation (LMSE), also known as Interaction by Exchange with the Mean (IEM), was the first model proposed to close the micromixing contribution to the evolution of the statistics of a scalar field; this model implies a linear relaxation of scalar field values towards its mean value. The Coalescence Dispersion (CD), also known as Curl, was proposed a few years later and it represents micromixing as a process discontinuous in time: a fraction of the total number of Monte Carlo particles is linked by pairs and every pair is instantaneously relaxed towards their local mean by a discontinuous jump. In this contribution, a new micromixing model is proposed where all the particles are linked by pairs, as in CD, and continuously relaxed, as in the LMSE, towards their local mean.

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