Download e-book for iPad: Direct and Large-Eddy Simulation VIII by Javier Jiménez, Ricardo García-Mayoral (auth.), Hans

By Javier Jiménez, Ricardo García-Mayoral (auth.), Hans Kuerten, Bernard Geurts, Vincenzo Armenio, Jochen Fröhlich (eds.)

ISBN-10: 9400724810

ISBN-13: 9789400724815

This quantity maintains earlier DLES lawsuits books, providing glossy advancements in turbulent circulation examine. it truly is finished in its assurance of numerical and modeling ideas for fluid mechanics. After Surrey in 1994, Grenoble in 1996, Cambridge in 1999, Enschede in 2001, Munich in 2003, Poitiers in 2005, and Trieste in 2009, the eighth workshop, DLES8, used to be held in Eindhoven, The Netherlands, back below the auspices of ERCOFTAC. Following the spirit of the sequence, the target of this workshop is to set up a state of the art of DNS and LES innovations for the computation and modeling of transitional/turbulent flows overlaying a huge scope of themes resembling aerodynamics, acoustics, combustion, multiphase flows, setting, geophysics and bio-medical purposes. This collecting of experts within the box was once a different chance for discussions in regards to the more moderen advances within the prediction, realizing and keep watch over of turbulent flows in educational or business situations.

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Example text

The difference between the original and the LES Navier-Stokes equations comes from the so-called subgrid-scale stress tensor: τi j = ui u j − ui u j acting only via the gradient of its traceless tensor hi = ∂ j τi j . Its exact value cannot be computed, it is needed to approximate the exact tensor τi j by a subgrid-scale model tensor τi j ≈ τiMj (ul ). The present study proposes a new framework to assess the LES models. So far, the assessment of subgrid-scale model relies either on a priori or a posteriori methods.

A new integral-based eddy viscosity dynamic SGS procedure was addressed, allowing for a mathematical consistent three- 32 Filippo Maria Denaro dimensional eddy viscosity to be deduced. The scaling law model is tested for several values of the computational parameters. When considering the discretization framework, the relevance of using a value of the ratio of the test to FV-based implicit filter width greater than the theoretical (and commonly used in LES codes) one is discovered. This is in accord to the use of an implicit primary filter.

Hence, the effective eddy viscosity, computed by discretizing the (3), is d νLES = Lddev : ∇d vd 4/3 2 ∇d vd − αd ∇d vd d,Δt d,Δt : ∇ d vd d,Δt . (4) For instance, Sarghini et al. [5] have demonstrated that better results for channel turbulent flow can be obtained by properly tuning the value of Δt /h according to the effective filter discretization. 30 Filippo Maria Denaro In order to properly assess the congruent filter parameters, one needs to estimate the ratio Δt h = Δt Δ Δ h = α Q. Substantially, the three computational filter parameters Δt h, α , Q, linked each other as α = αd Q, Δt h , have to be taken into account for a correct dynamic modeling.

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Direct and Large-Eddy Simulation VIII by Javier Jiménez, Ricardo García-Mayoral (auth.), Hans Kuerten, Bernard Geurts, Vincenzo Armenio, Jochen Fröhlich (eds.)


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