Two and fourway coupled Euler–Lagrangian largeeddy simulation of turbulent particleladen channel flow
Vreman, Bert and Geurts, Bernard J. and Deen, N.G. and Kuipers, J.A.M. and Kuerten, J.G.M. (2009) Two and fourway coupled Euler–Lagrangian largeeddy simulation of turbulent particleladen channel flow. Flow, turbulence and combustion, 82 (1). pp. 4771. ISSN 13866184

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Abstract:  Largeeddy simulations (LES) of a vertical turbulent channel flow laden with a very large number of solid particles are performed. The motivation for this research is to get insight into fundamental aspects of cocurrent turbulent gasparticle flows, as encountered in riser reactors. The particle volume fraction equals about 1.3%, which is relatively high in the context of modern LES of twophase flows. The channel flow simulations are based on largeeddy approximations of the compressible Navier–Stokes equations in a porous medium. The Euler–Lagrangian method is adopted, which means that for each individual particle an equation of motion is solved. The method incorporates fourway coupling, i.e., both the particlefluid and particle–particle interactions are taken into account. The results are compared to singlephase channel flow in order to investigate the effect of the particles on turbulent statistics. The present results show that due to particle–fluid interactions the mean fluid profile is flattened and the boundary layer is thinner. Compared to singlephase turbulent flow, the streamwise turbulence intensity of the gas phase is increased, while the normal and spanwise turbulence intensities are reduced. This finding is generally consistent with existing experimental data. The fourway coupled simulations are also compared with twoway coupled simulations, in which the inelastic collisions between particles are neglected. The latter comparison clearly demonstrates that the collisions have a large influence on the main statistics of both phases. In addition, the fourway coupled simulations contain stronger coherent particle structures. It is thus essential to include the particle–particle interactions in numerical simulations of twophase flow with volume fractions around one percent. 
Item Type:  Article 
Copyright:  © 2008 Springer 
Faculty:  Electrical Engineering, Mathematics and Computer Science (EEMCS) 
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Link to this item:  http://purl.utwente.nl/publications/59747 
Official URL:  http://dx.doi.org/10.1007/s104940089173z 
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