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Particulate flow

In March 2002 I joined the Dept. of Fossil Fuels at CIEMAT in Madrid, Spain, where I began to study fluid flows containing solid particles. Eventually, the goal is to be able to predict with better accuracy the behaviour of fluidized beds which are used in combustion facilities for such substances as coal dust, organic residues etc. However, adequate models for the various macroscopic effects of the fluid-particle interactions (e.g. formation of agglomerations) and the interaction between particles and a solid wall (e.g. increased particle concentration near walls) are still lacking. The plan is to perform 'direct simulation' of these flows in an idealized setting, i.e. for low Reynolds number and a limited number of particles. These computations should provide a valuable base for the formulation and scrutinization of closure models (e.g. as arising in the framework of two-fluid formulations).

In the framework of the present project, a numerical tool capable of simulating the flow of O(1000-10000) rigid particles suspended in a fluid and moving at particle Reynolds numbers of O(100-1000) is envisaged. For this purpose, the method of 'fictitious domains' will be used (e.g. [1][2][3][4][5]). In this approach, the solid part of the domain is treated as if it belonged to the fluid as well. The physically correct behaviour of the particles is imposed by adequate volume forces which are added to the momentum equations at the respective locations.

We have performed the following intermediate steps:

Currently we are performing extensive large-scale simulations of various problems involving dilute and dense conditions:

markus.uhlmann AT kit.edu

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