A fluid-structure interaction study of biofilm detachment

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Title: A fluid-structure interaction study of biofilm detachment
Authors: Safari, Ashkan
Ivankovic, Alojz
Tuković, Željko
et al.
Permanent link: http://hdl.handle.net/10197/4594
Date: 1-Jul-2009
Abstract: During the biofilm development process, bacterial cells may detach from the biofilm into the surrounding fluid. The key question in relation to detachment from bacterial biofilm is the mechanical response to hydrodynamic forces. In this study, a Finite Volume Method (FVM) based Fluid-Structure Interaction (FSI) solver in OpenFOAM package has been developed to model the biofilm response to flow [1]. Dynamic interaction was simulated between an incompressible Newtonian fluid and a bacterial biofilm described as a linear viscoelastic solid. Viscoelastic response of the biofilm was represented by the hereditary integral form of constitutive relation [2] while tensile relaxation modulus was expressed by the Generalised Maxwell Model (GMM) in the form of Prony series (a discrete retardation spectrum). GMM was obtained from the rheometry creep experimental data using a three-step method proposed by Dooling et al. [3]. The creep curves were all viscoelastic in nature and approximated by a linear viscoelastic model represented by Generalised Voigt Model (GVM). Elastic shear modulus (G), obtained from the three-step method, ranged from 583Pa to 1368Pa which were similar to the previous rheometry studies. In this two-dimensional model, biofilm was considered as semi-semispherical shape (thickness of 100μm and width of 346μm) attached to the center of the bottom boundary of the square cross-section flow cell. Fluid flow through the flow cell was in laminar regime. Simulation results predicted the potential site for biofilm detachment subjected to increasing fluid flow rate through the flow cell.
Type of material: Conference Publication
Publisher: Computational & Mathematical Biomedical Engineering (CMBE)
Copyright (published version): 2009 The Authors
Keywords: Biofilm;Viscoelasticity;Fluid-Structure Interaction;Finite Volume Method
Language: en
Status of Item: Not peer reviewed
Conference Details: Computational and Mathematical Biomedical Engineering (CMBE09)
Appears in Collections:Mechanical & Materials Engineering Research Collection
Chemical and Bioprocess Engineering Research Collection

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