Abstract
The paper presents the results of direct numerical simulation of two homogeneous shear flows of different initial strain number (St) and a decaying isotropic turbulence with an infinite-rate chemical reaction between two species but without heat release. The simulations were performed using a (96)3 computational grid and an initial Taylor’s Reynolds number, Re λ, of 25. The results show that shear flattens the reaction surface due to the augmented strain rates resulting from vortex stretching. The time evolution of the scalar pdf shows that the higher the strain number is the higher the scalar mixing rate. The directions of the instantaneous scalar flux and the instantaneous scalar gradient are uncorrelated, thus indicating that turbulent scalar transport is a nongradient mechanism.
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References
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© 1991 Springer-Verlag Berlin Heidelberg
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Elghobashi, S., Nomura, K.K. (1991). Direct Simulation of a Passive Diffusion Flame in Sheared and Unsheared Homogeneous Turbulence. In: Durst, F., Launder, B.E., Reynolds, W.C., Schmidt, F.W., Whitelaw, J.H. (eds) Turbulent Shear Flows 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76087-7_23
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DOI: https://doi.org/10.1007/978-3-642-76087-7_23
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-76089-1
Online ISBN: 978-3-642-76087-7
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