By M. Germano (auth.), R. Friedrich, W. Rodi (eds.)
The articles specialize in new advancements within the box of large-eddy simulation of advanced flows and are concerning the themes: modelling and research of subgrid scales, numerical concerns in LES cartesian grids for complicated geometries, curvilinear and non-structured grids for advanced geometries. DES and RANS-LES coupling, plane wake vortices, combustion and magnetohydrodynamics.
Progress has been made not just in figuring out and modelling the dynamics of unresolved scales, but in addition in designing implies that hinder the infection of LES predictions via discretization mistakes. development is pronounced to boot at the use of cartesian and curvilinear coordinates to compute circulation in and round complicated geometries and within the box of LES with unstructured grids. A bankruptcy is devoted to the detached-eddy simulation procedure and its contemporary achievements and to the promising means of coupling RANS and LES ideas so one can push the resolution-based Reynolds quantity restrict of wall-resolving LES to better values.
Complexity as a result of actual mechanisms hyperlinks the final chapters. it truly is proven that LES constitutes the software to examine the physics of airplane wake vortices in the course of touchdown and takeoff. Its thorough figuring out is a prerequisite for trustworthy predictions of the space among consecutive touchdown airplanes. Subgrid combustion modelling for LES of unmarried and two-phase reacting flows is tested to have the capability to house finite-rate kinetics in excessive Reynolds quantity flows of full-scale fuel turbine engines. Fluctuating magnetic fields are extra reliably expected through LES whilst tensor-diffusivity instead of gradient-diffusion types are used. An encouraging bring about the context of turbulence regulate via magnetic fields.
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Additional info for Advances in LES of Complex Flows: Proceedings of the Euromech Colloquium 412, held in Munich, Germany 4–6 October 2000
2001b), removing the arbitrariness of an a priori parameter choice. 3. ADM employed with low-order finite-difference schemes for compressible isotropic decaying turbulence Industrial CFD codes commonly employ low-order discretization schemes such as order finite differences. , 2001b. In order to assess the feasibility of ADM for implementation in industrial CFD codes, we study the effect of the spatial discretization order on the results of ADM in this section. ADM FOR COMPRESSIBLE FLOWS 37 As test case we consider compressible decaying isotropic turbulence.
KLEISER the order scheme. The transfer function of the filters with is shown in figure 2(b). First we use the same resolution and filter cutoff wavenumber for the pseudospectral LES and for the LES with the and order differentiation scheme. The corresponding results are shown as curves in figure 3, while filtered DNS data are displayed as symbols. Figure 3(a) shows the turbulent kinetic energy and figure 3(b) the root-mean-square density fluctuations as a function of the time normalized with the initial eddy-turn-over time These quantities are overpredicted by the order scheme by almost 10%, whereas the order scheme gives almost as good results as the spectral scheme for these quantities.
The paper considers two different issues. First, we study the feasibility of low-order schemes with ADM for large-eddy simulation. As test case compressible decaying isotropic turbulence is considered. Results obtained with low-order finite difference schemes and a pseudospectral scheme are compared with filtered well-resolved direct numerical simulation (DNS) data. It is found that even for low-order schemes very good results can be obtained if the cutoff wavenumber of the filter is adjusted to the modified wavenumber of the differentiation scheme.
Advances in LES of Complex Flows: Proceedings of the Euromech Colloquium 412, held in Munich, Germany 4–6 October 2000 by M. Germano (auth.), R. Friedrich, W. Rodi (eds.)