A time-accurate scheme for the calculations of unsteady reactive flows at low Mach number
✍ Scribed by C. Corvellec; P. Bruel; V.A. Sabel'nikov
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 294 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0271-2091
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✦ Synopsis
The artificial compressibility method is extended to the case of unsteady turbulent reacting flows at low Mach number. The resulting scheme is applied to the calculation of a propagating one-dimensional (1D) planar turbulent flame with a realistic heat release parameter. An eddy break-up-like approach, with a conventional gradient expression for the turbulent fluxes, is retained to model this reacting turbulent flow. A quenched form of the mean reaction rate is used to ensure the existence of a steady regime of propagation, for which the present results are compared with those obtained by a steady analysis of the mean flame brush structure, with excellent agreement. A sensitivity analysis of the convergence rate to the values of the artificial compressibility factor and the pseudo-time is carried out. It is shown that a reduced artificial compressibility factor of 5-10, combined with a pseudo-Courant number of : 1000, represents a good compromise to optimize the convergence rate.