A Continuum/Kinetic Hybrid Approach for Multi-Scale Flow Simulation

This paper describes a continuum/kinetic hybrid approach for simulating the continuum to free molecule, multi-scale flows. Domain decomposition strategy is adopted for coupling the continuum and kinetic approaches. A multi-scale computational domain is decomposed into the continuum regions and the kinetic regions. Instead of the direct...

On the required Reynolds-number dependence of variational multi-scale Smagorinsky models

A theoretical analysis is presented on the dependence of the standard and variational multi-scale Smagorinsky models on the proximity of the LES filter width Delta to the integral length scale of turbulence L on the one hand, and to the Kolmogorov scale eta on the other hand. Moreover modifications of the models are formulated, which respond...

A block structured Low Mach Number MPV scheme for heterogeneous domain decomposition

This paper is concerned with heterogeneous domain decomposition for semi-implicit Low Mach number schemes. The actual scheme is the Multiple Pressure Variables (MPV) scheme, which can be applied for a large range of Low Mach Number flows, ranging from natural convection flows with large temperature and density changes to aero-acoustics with...

Representative volumes and multi-scale modelling of quasi-brittle materials

Several different approaches are available in order to describe material behaviour. Considering material on the higher (macro) level of observation constitutes the macroscopic approach. However, the key to understand a macro materials behaviour lies in its mesostructure. As such the mesoscopic approach can be used which is based on the detailed...