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Eulerian‐Lagrangian simulations of settling and agitated dense solid‐liquid suspensions – achieving grid convergence
Author(s) -
Derksen J. J.
Publication year - 2018
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16061
Subject(s) - lattice boltzmann methods , eulerian path , impeller , mechanics , reynolds number , lagrangian particle tracking , settling , multiphase flow , mixing (physics) , grid , particle (ecology) , flow (mathematics) , cfd dem , physics , classical mechanics , mathematics , lagrangian , computational fluid dynamics , thermodynamics , mathematical analysis , geometry , turbulence , geology , oceanography , quantum mechanics
Eulerian‐Lagrangian simulations of solid–liquid flow have been performed. The volume‐averaged Navier‐Stokes equations have been solved by a variant of the lattice‐Boltzmann method; the solids dynamics by integrating Newton's second law for each individual particle. Solids and liquid are coupled via mapping functions. The application is solids suspension in a mixing tank operating in the transitional regime (the impeller‐based Reynolds number is 4000), an overall solids volume fraction of 10% and a particle–liquid combination with an Archimedes number of 30. In this application, the required grid resolution is dictated by the liquid flow and we thus need freedom to choose the particle size independent of the grid spacing. Preliminary hindered settling simulations show that the proposed Eulerian‐Lagrangian mapping strategy indeed offers this independence. The subsequent mixing tank simulations generate grid‐independent results. © 2018 American Institute of Chemical Engineers AIChE J , 64: 1147–1158, 2018