TAILIEUCHUNG - High Performance Computing on Vector Systems-P4

High Performance Computing on Vector Systems-P4: In March 2005 about 40 scientists from Europe, Japan and the US came together the second time to discuss ways to achieve sustained performance on supercomputers in the range of Teraflops. The workshop held at the High Performance Computing Center Stuttgart (HLRS) was the second of this kind. The first one had been held in May 2004. | Numerical Simulation of Transition and Turbulence 83 the classical eddy-viscosity models the HPF eddy-viscosity models are able to predict backscatter. It has been shown that in channel flow locations with intense backscatter are closely related to low-speed turbulent streaks in both LES and filtered DNS data. In Schlatter et al. 2005b on the basis of spectral a discretisation a close relationship between the HPF modelling approach and the relaxation term of ADM and ADM-RT could be established. By an accordingly modified high-pass filter these two approaches become analytically equivalent for homogeneous Fourier directions and constant model coefficients. The new high-pass filtered HPF eddy-viscosity models have also been applied successfully to incompressible forced homogeneous isotropic turbulence with microscale Reynolds numbers Re up to 5500 and to fully turbulent channel flow at moderate Reynolds numbers up to ReT 590 Schlatter et al. 2005b . Most of the above references show that . for the model problem of temporal transition in channel flow spatially averaged integral flow quantities like the skin-friction Reynolds number ReT or the shape factor H12 of the mean velocity profile can be predicted reasonably well by LES even on comparably coarse meshes see . Germano et al. 1991 Schlatter et al. 2004a . However for a reliable LES it is equally important to faithfully represent the physically dominant transitional flow mechanisms and the corresponding three-dimensional vortical structures such as the formation of A-vortices and hairpin vortices. A successful SGS model needs to predict those structures well even at low numerical resolution as demonstrated by Schlatter et al. 2005d 2006 Schlatter 2005 . The different SGS models have been tested in both the temporal and the spatial transition simulation approach see Schlatter et al. 2006 . For the spatial simulations the fringe method has been used to obtain non-periodic flow solutions in the spatially .

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