Read e-book online Advances in Fluid Mechanics VIII (Wit Transactions on PDF

By M Rahman, C. A. Brebbia, M. Rahman

ISBN-10: 184564476X

ISBN-13: 9781845644765

This ebook comprises the papers provided on the 8th overseas convention on Advances in Fluid Mechanics held September 15-17, 2010, in Algarve, Portugal. This biennial convention is the most recent in a profitable sequence that begun in 1996. The convention offers a platform for engineering execs to percentage advances and new purposes within the region of fluid mechanics.

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Combustion closure in LES is achieved through a Turbulence Chemistry Interaction Model (TCIM). Most of the developed TCIM are based on the already existing RANS model. In the present study, a TCIM based on the Eddy Dissipation Concept (EDC) is proposed for large eddy simulation. The model is formulated from subgrid viscosity and filtered strain rate tensor. EDC model constants are modified to account for the partial energy cascading in LES. The other model used in this study is the steady state Flamelet model.

Turbulence contains eddies of different length and time scale. Larger eddies extract energy from the mean flow, these eddies are highly unstable and breakdown in smaller eddies. This breakdown process continues until eddies are sufficient small and they can not transfer energy further down. Eventually, this process creates structures that are small enough that molecular diffusion becomes important and viscous dissipation of kinetic energy finally takes place. The scale at which this happens is the Kolmogorov length scale.

The smallest length scale available in LES is a filter width. The size of the fine structure eddies is much smaller than the filter width and need to be computed as a function of filter width. In principle, these fine structure regions are embedded within highly strained eddies. The transport equation Eq. (3) requires a closure for the source term. In EDC model, it is assumed that each numerical cell consists of a reactor, with inflow equal to surrounding mass fraction and outflow equal to burnt fine structures.

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Advances in Fluid Mechanics VIII (Wit Transactions on Engineering Sciences) by M Rahman, C. A. Brebbia, M. Rahman

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