By Bernard J. Geurts, Darryl D. Holm (auth.), Rainer Friedrich, Bernard J. Geurts, Olivier Métais (eds.)
The 5th ERCOFfAC workshop 'Direct and Large-Eddy Simulation-5' (DLES-5) was once held on the Munich college of expertise, August 27-29, 2003. it truly is a part of a sequence of workshops that originated on the collage of Surrey in 1994 so that it will offer a discussion board for presentation and dis cussion of modern advancements within the box of direct and large-eddy simula tion. through the years the DLES-series has grown right into a significant overseas venue focussed on all features of DNS and LES, but additionally on hybrid equipment like RANSILES coupling and detached-eddy simulation designed to supply trustworthy solutions to technical circulate difficulties at average computational expense. DLES-5 was once attended by way of 111 delegates from 15 nations. Its three-day professional gramme coated ten invited lectures and sixty three unique contributions in part pre sented in parallel classes. The workshop was once financially supported by way of the fol lowing businesses, associations and enterprises: ANSYS Germany GmbH, AUDI AG, BMW workforce, ERCOFfAC, FORTVER (Bavarian examine Asso ciation on Combustion), JM BURGERS CENTRE for Fluid Dynamics. Their assistance is gratefully said. the current court cases comprise the written types of 9 invited lectures and fifty-nine chosen and reviewed contributions that are prepared in 4 elements: 1 concerns in LES modelling and numerics 2 Laminar-turbulent transition three Turbulent flows related to advanced actual phenomena four Turbulent flows in complicated geometries and in technical applications.
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Extra info for Direct and Large-Eddy Simulation V: Proceedings of the fifth international ERCOFTAC Workshop on direct and large-eddy simulation held at the Munich University of Technology, August 27–29, 2003
C: 1984. Improved turbulence models based on LES of homogeneous incompressible turbulent flows. Department of Mechanical Engineering. Report No. TF-J9, Stanford. : 2001. The Navier-Stokes-alpha model of fluid turbulence. Physica D, 152, 505. : 1986. Differential filters for the large-eddy numerical simulation of turbulent flows. Phys. of Fluids, 29, 1755. : 1992. Turbulence: the filtering approach. J. , 238,325. : 1997. Inverse modeling for large-eddy simulation. Phys. of Fluids, 9, 3585. : 2002.
Figure 2. 0 30 ~ CI) 20 10 00 Figure 3. 56 . , 1996, it was noted that the shear-free mixing layer was not strongly anisotropic. We decided to explore in more detail this property for the higher Reynolds number considered here. This property is very important in the context of LES since isotropy of the small scales is usually assumed in most LES models. , 1983) defined as: tan2 () = 2 G xx Gy x + Gx y + Gxz + Gyy + Gyz ) (3) 36 DIRECT AND LARGE-EDDY SIMULATION V where G ij is the average square value of the velocity gradient components: G ij = (OiUj)2 (no summation).
One difficulty of this approach concerns the dissipation of the loworder schemes used, which might be too strong as shown for instance for the shock-capturing schemes . To closely control the dissipation, it then appears more appropriate to use low-dissipative numerical schemes, while applying explicitly a compact/selective filter to the flow variables with the aim of removing only the higher wave numbers located near the grid cutoff wave number. Note that this approach was recently successfully applied to isotropic turbulence, channel flows and jets ,[8, 9].
Direct and Large-Eddy Simulation V: Proceedings of the fifth international ERCOFTAC Workshop on direct and large-eddy simulation held at the Munich University of Technology, August 27–29, 2003 by Bernard J. Geurts, Darryl D. Holm (auth.), Rainer Friedrich, Bernard J. Geurts, Olivier Métais (eds.)