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reactingEulerFoam: populationBalanceModel: Added fractal shape modell…
…ing support This change adds representation of the shape of a dispersed phase. A layer has been added to model the relationship between the characteristic volume of a sizeGroup and its physical diameter. Previously this relationship was represented by a constant form factor. Currently, two shape models are available: - spherical - fractal (for modelling fractal agglomerates) The latter introduces the average surface area to volume ratio, kappa, of the entities in a size group as a secondary field-dependent internal variable to the population balance equation, which makes the population balance approach "quasi-"bivariate. From kappa and a constant mass fractal dimension, a collisional diameter can be derived which affects the coagulation rates computed by the following models: - ballisticCollisions - brownianCollisions - DahnekeInterpolation - turbulentShear The fractal shape modelling also takes into account the effect of sintering of primary particles on the surface area of the aggregate. Further additions/changes: - Time scale filtering for handling large drag and heat transfer coefficients occurring for particles in the nanometre range - Aerosol drag model based on Stokes drag with a Knudsen number based correction (Cunningham correction) - Reaction driven nucleation - A complete redesign of the sizeDistribution functionObject The functionality is demonstrated by a tutorial case simulating the vapour phase synthesis of titania by titanium tetrachloride oxidation. Patch contributed by Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden - Rossendorf (HZDR) and VTT Technical Research Centre of Finland Ltd.
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