By H. Oh
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Extra info for Advanced Fluid Dynamics
Longer calculation times than the RANS models. Provides excellent results for all flow systems. LES solves the Navier-Stokes equations for large scale motions of the flow models only the small scale motions. 46 Advanced Fluid Dynamics Family group Models Description and advantages The difficulties associated with the use of the standard LES models, has lead to the development of hybrid models (like that DES) that attempt to combine the best aspects of RANS and LES methodologies in a single solution strategy.
2 0 -200 -100 0 100 200 (deg) (c) Fig. 5. s. field of the CABARET solution, (b) comparison of the fine-grid CABARET results with the reference solution of Colonius et al (1994), (c) comparison of the fine-grid 3rd order Roe/MUSCL results with the reference solution of Colonius et al (1994). 5c. 5a), for the RoeMUSCL scheme there is some 30% overprediction of the peak sound directivity that is associated with numerical dispersion. Clearly, the acoustic peak corresponds to the downstream vortex direction where the sound waves spend more time inside the strongest vortex-induced hydrodynamic field and which direction is more sensitive to the linear dispersion error of the numerical scheme.
Finally, the bubbles become large enough to occupy a substantial fraction of the cross-section of the small diameter columns (Vejahati 2006). These large bubbles are called slug, as shown in the third column of Figure 1. 2 Particle classification The behavior of solids fluidized by gases fall into four clearly recognizable groups, characterized by density difference (ρs – ρf) and mean particle size. The features of the groups are: powders in group A exhibit dense phase expansion after minimum fluidization and prior to the commencement of bubbling; those in group B bubble at the minimum fluidization velocity; those in group C are difficult to fluidize at all and those in group D can 41 Fluid Dynamics of Gas – Solid Fluidized Beds form stable spouted beds (Geldart 1973).
Advanced Fluid Dynamics by H. Oh