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Yoo, Chun Sang
Combustion & Propulsion Lab
Research Interests
  • Numerical turbulent combustion

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Characteristic boundary conditions for simulations of compressible reacting flows with multi-dimensional, viscous and reaction effects

Cited 67 times inthomson ciCited 73 times inthomson ci
Title
Characteristic boundary conditions for simulations of compressible reacting flows with multi-dimensional, viscous and reaction effects
Author
Yoo, Chun SangIm, H. G.
Keywords
Characteristic boundary conditions; Compressible reacting flows; Direct numerical simulation; Locally one-dimensional inviscid approximation; Low Mach number asymptotics
Issue Date
200704
Publisher
TAYLOR & FRANCIS LTD
Citation
COMBUSTION THEORY AND MODELLING, v.11, no.2, pp.259 - 286
Abstract
A generalized formulation of the characteristic boundary conditions for compressible reacting flows is proposed. The new and improved approach resolves a number of lingering issues of spurious solution behaviour encountered in turbulent reacting flow simulations in the past. This is accomplished (a) by accounting for all the relevant terms in the determination of the characteristic wave amplitudes and (b) by accommodating a relaxation treatment for the transverse gradient terms with the relaxation coefficient properly determined by the low Mach number asymptotic expansion. The new boundary conditions are applied to a comprehensive set of test problems including: vortex-convection; turbulent inflow; ignition front propagation; non-reacting and reacting Poiseuille flows; and counterflow cases. It is demonstrated that the improved boundary conditions perform consistently superior to existing approaches, and result in robust and accurate solutions with minimal acoustic wave interactions at the boundary in hostile turbulent combustion simulation conditions.
URI
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DOI
http://dx.doi.org/10.1080/13647830600898995
ISSN
1364-7830
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