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Michael E. Mueller
Princeton University
99Publications
17H-index
844Citations
Publications 99
Newest
#1Alex G. Novoselov (Princeton University)H-Index: 1
#2Christopher B. Reuter (Princeton University)H-Index: 8
Last.Michael E. Mueller (Princeton University)H-Index: 17
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Abstract Turbulence, low-temperature chemistry, and their interactions in the form of turbulent cool flames are critical to understanding and improving advanced engines. Design of such engines requires tractable simulations which in turn necessitate turbulent combustion models that can account for cool flames. While manifold-based turbulent combustion models are an attractive option for hot flames, their applicability to cool flames is not yet fully understood. This is partially due to the lack ...
#1Suo Yang (Princeton University)H-Index: 12
#2Jeffry K. Lew (Princeton University)
Last.Michael E. Mueller (Princeton University)H-Index: 17
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Abstract In turbulent reacting flows, soot evolution is strongly influenced by small-scale soot–turbulence–chemistry interactions. Specifically, soot is formed during combustion of fuel-rich mixtures and, in non-smoking flames, is rapidly oxidized at slightly fuel-rich mixtures before being transported by turbulence into fuel-lean mixtures. Furthermore, different soot evolution mechanisms are dominant over distinct regions of mixture fraction. For these reasons, a new subfilter PDF is proposed t...
#1Austin C. Nunno (Princeton University)
#2Bruce A. Perry (Princeton University)H-Index: 2
Last.Michael E. Mueller (Princeton University)H-Index: 17
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#1A. Cody Nunno (Princeton University)H-Index: 2
#2Temistocle Grenga (Princeton University)H-Index: 4
Last.Michael E. Mueller (Princeton University)H-Index: 17
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Heat losses have the potential to substantially modify turbulent combustion processes, especially the formation of pollutants such as nitrogen oxides. The chemistry governing these species is strongly temperature sensitive, making heat losses critical for an accurate prediction. To account for the effects of heat loss in large eddy simulation (LES) using a precomputed reduced-order manifold approach, thermochemical states must be precomputed not only for adiabatic conditions but also over a rang...
#1Suo Yang (Princeton University)H-Index: 12
#2Michael E. Mueller (Princeton University)H-Index: 17
Abstract A new Multi-Moment Sectional Method (MMSM) is proposed for tracking the evolution of the soot Number Density Function (NDF). Unlike conventional sectional methods, in MMSM, multiple statistical moments are solved within each section, and the size distribution within each section is reconstructed from a polynomial profile or, for the last section, an exponential profile. MMSM can be reduced to a method of moments with a single section to minimize the computational cost and reduced to a s...
#1A. Cody Nunno (Princeton University)H-Index: 2
#2Michael E. Mueller (Princeton University)H-Index: 17
Abstract Accurate predictions of heat losses in turbulent combustion are critical for accurate predictions of pollutant emissions such as nitrogen oxides and soot due to their extreme sensitivity to the underlying gas-phase temperature and composition. Reduced-order manifold approaches to modeling turbulent combustion require an additional enthalpy or enthalpy-like parameter to account for these heat losses. The particular focus of this work is radiation heat losses in turbulent nonpremixed comb...
#1Jonathan F. MacArt (Princeton University)H-Index: 2
#2Temistocle Grenga (Princeton University)H-Index: 4
Last.Michael E. Mueller (Princeton University)H-Index: 17
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Abstract Turbulence in low Karlovitz number premixed flames is strongly affected by small-scale combustion heat release. At low Karlovitz number conditions, flame-normal thermal expansion leads to increased anisotropy of the velocity field, and pressure-dilatation becomes the most significant source of turbulent kinetic energy (TKE). These effects are balanced in TKE budgets by the phenomenon of “negative production,” which leads to changes to the Reynolds stress tensor that are independent of t...
#1Alex G. Novoselov (Princeton University)H-Index: 1
#2Chung King Law (Princeton University)H-Index: 81
Last.Michael E. Mueller (Princeton University)H-Index: 17
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Abstract “Cool” flames result from the coupling of low-temperature chemistry with molecular transport. These flames have been experimentally and computationally observed under laminar flow conditions but have not been isolated under turbulent flow conditions. In this work, a skeletal n-heptane chemical mechanism including low-temperature chemistry is used to conduct two-dimensional Direct Numerical Simulations (DNS) of nonpremixed “cool” flames subjected to unsteady, two-dimensional flow initial...
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