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Identifying dominant spatial and time characteristics of flow dynamics within free-surface baffled stirred-tanks from CFD simulations

de Lamotte, A; Delafosse, A; Calvo, S; Toye, D; (2018) Identifying dominant spatial and time characteristics of flow dynamics within free-surface baffled stirred-tanks from CFD simulations. Chemical Engineering Science , 192 pp. 128-142. 10.1016/j.ces.2018.07.024. Green open access

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Abstract

In many chemical and biochemical processes, it is fundamental to accurately predict flow dynamicswithin reactors of different sizes and its influence on reactions and their kinetics. Computational FluidDynamics can provide detailed modeling about hydrodynamics. The objective of the present work is toassess the abilities of CFD to simulate free-surface turbulent flow within baffled stirred-tanks reactors.Transient simulations are carried out using a homogeneous Euler-Euler multiphase approach, theVolume-of-Fluid (VOF) method, with a Realizable k—e turbulence model. Two methods are consideredto account for the impeller motion, namely the Multiple Reference Frame (MRF) and Sliding Mesh(SM) approaches. Global and local results obtained by CFD are presented by means of statistical analysis,including the estimation of characteristic turbulent length scales. Instantaneous numerical data fieldsobtained with the SM model are then interpreted using modal decompositions methods, i.e. the ProperOrthogonal Decomposition (POD) and the Dynamic Mode Decomposition (DMD) in order to extract theirdominant spatial structures with their time behavior. All simulations are discussed based on comparisonwith experimental data.

Type: Article
Title: Identifying dominant spatial and time characteristics of flow dynamics within free-surface baffled stirred-tanks from CFD simulations
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ces.2018.07.024
Publisher version: http://doi.org/10.1016/j.ces.2018.07.024
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Stirred-tank, Hydrodynamics, CFD, PIV, POD, DMD
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Biochemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10061590
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