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Browsing by Author "Oxtoby, Oliver F"

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3D, parallel fluid-structure interaction code

Author: Oxtoby, Oliver F ; Malan, AG Date: Jan 2011 The authors describe the development of a 3D parallel Fluid–Structure–Interaction (FSI) solver and its application to benchmark problems. Fluid and solid domains are discretised using and edge-based finite-volume scheme for efficient parallel ... Read more
An accelerated, fully-coupled, parallel 3D hybrid finite-volume fluid–structure interaction scheme

Author: Malan, AG ; Oxtoby, Oliver F Date: Sep 2012 In this paper we propose a fast, parallel 3D, fully-coupled partitioned hybridunstructured finite volume fluid–structure-interaction (FSI) scheme. Spatial discretisation is effected via a vertex-centered finite volume method, where a hybrid ... Read more
Adaptively trained reduced-order model for acceleration of oscillatory flow simulations

Author: Oxtoby, Oliver F Date: Jul 2012 We present an adaptively trained Reduced-Order Model (ROM) to dramatically speed up flow simulations of an oscillatory nature. Such repetitive flowfields are frequently encountered in fluid-structure interaction modelling, aeroelastic flutter ... Read more
A computationally efficient 3D finite-volume scheme for violent liquid–gas sloshing

Author: Oxtoby, Oliver F ; Malan, AG ; Heyns, Johan A Date: Oct 2015 We describe a semi-implicit volume-of-fluid free-surface-modelling methodology for flow problems involving violent free-surface motion. For efficient computation, a hybrid-unstructured edge-based vertex-centred finite volume discretisation ... Read more
Development of a compressive surface capturing formulation for modelling free-surface flow by using the volume-of-fluid approach

Author: Heyns, Johan A ; Malan, AG ; Harms, TM ; Oxtoby, Oliver F Date: Jun 2012 With the aim of accurately modelling free-surface flow of two immiscible fluids, this study presents the development of a new volume-of-fluid free-surface capturing formulation. By building on existing volume-of-fluid approaches, the new ... Read more
Development of a partitioned finite volume-finite element fluid-structure interaction scheme for strongly-coupled problems

Author: Suliman, Ridhwaan ; Oxtoby, Oliver F ; Malan, AG ; Kok, S Date: Jul 2012 This work details the development of a computational tool that can accurately model strongly-coupled fluid-structure interaction (FSI) problems, with a particular focus on thin-walled structures undergoing large, non-linear deformations. The ... Read more
Development of strongly coupled FSI technology involving thin walled structures

Author: Suliman, Ridhwaan ; Oxtoby, Oliver F ; Malan, AG ; Kok, S Date: Jan 2011 A strongly coupled finite volume-finite element fluid-structure interaction (FSI) scheme is developed. Both an edge-based finite volume and Galerkin finite element scheme are implemented and evaluated for modelling the mechanics of solids. ... Read more
Efficient modelling of aerodynamic flows in the boundary layer for high performance computing

Author: Smith, L ; Oxtoby, Oliver F ; Malan, AG ; Meyer, JP Date: Jan 2011 A unique technique to couple boundary-layer solutions with an inviscid solver is introduced. The boundary-layer solution is obtained using the two-integral method to solve displacement thickness with Newton’s method, at a fraction of the cost ... Read more
An enhanced finite volume method to model 2D linear elastic structures

Author: Suliman, Ridhwaan ; Oxtoby, Oliver F ; Malan, AG ; Kok, S Date: Apr 2014 This paper details the evaluation and enhancement of the vertex-centred finite volume method for the purpose of modelling linear elastic structures undergoing bending. A matrix-free edge-based finite volume procedure is discussed and compared ... Read more
An enhanced matrix-free edge-based finite volume approach to model structures

Author: Suliman, Ridhwaan ; Oxtoby, Oliver F ; Malan, AG ; Kok, S Date: Jan 2010 This paper presents the formulation, implementation and evaluation of an enhanced matrix free edge-based finite volume approach to model the mechanics of solids undergoing large non-linear deformations. The developed technology is evaluated ... Read more
An interactive boundary layer modeling methodology for aerodynamic flows[Presentation]

Author: Smith, L ; Meyer, JP ; Oxtoby, Oliver F ; Malan, AG Date: Nov 2011 The authors propose to develop a new method to couple Drela’s twointegral equations with a generic outer flow solver in an iterative fashion. They introduce an auxiliary equation which is solved along with the displacement thickness to overcome ... Read more
An interactive boundary layer modelling methodology for aerodynamic flows

Author: Smith, L ; Oxtoby, Oliver F ; Malan, A ; Meyer, J Date: 2013 The purpose of this paper is to introduce a unique technique to couple the two-integral boundary layer solutions to a generic inviscid solver in an iterative fashion. Read more
A matrix free, partitioned solution of fluid-structure interaction problems using finite volume and finite element methods

Author: Suliman, Ridhwaan ; Oxtoby, Oliver F ; Malan, AG ; Kok, S Date: Jan 2015 A fully-coupled partitioned finite volume–finite volume and hybrid finite volume–finite element fluid-structure interaction scheme is presented. The fluid domain is modelled as a viscous incompressible isothermal region governed by the ... Read more
A matrix-free, implicit, incompressible fractional-step algorithm for fluid–structure interaction applications

Author: Oxtoby, Oliver F ; Malan, AG Date: May 2012 In this paper we detail a fast, fully-coupled, partitioned fluid–structure interaction (FSI) scheme. For the incompressible fluid, new fractional-step algorithms are proposed which make possible the fully implicit, but matrixfree, parallel ... Read more
Modelling dynamic liquid-gas systems: Extensions to the volume-of-fluid solver

Author: Heyns, Johan A ; Oxtoby, Oliver F ; Suliman, Ridhwaan Date: Jun 2013 This study presents the extension of the volume-of-fluid solver, interFoam, for improved accuracy and efficiency when modelling dynamic liquid-gas systems. Examples of these include the transportation of liquids, such as in the case of fuel ... Read more
Multi-physics fluid-structure interaction modelling software

Author: Malan, AG ; Oxtoby, Oliver F Date: Nov 2008 The CSIR reseachers developed a new ground-breaking sofware modelling technlogies to be used in the design of safe and efficient next-generation aircraft. The field of Fluid-structure interaction (FIS) covers a massive range of engineering ... Read more
Multi-scale simulation of droplet-droplet interactions and coalescence

Author: Musehane, Ndivhuwo M ; Oxtoby, Oliver F ; Reddy, DB Date: Oct 2016 In this work, droplet-droplet interaction is modelled using a multiphase flow computational fluid dynamics approach coupled with a reduced order surface thin-film model. An existing multiphase flow model based on a multiple marker volume of ... Read more
Multi-scale simulation of droplet–droplet interaction and coalescence

Author: Musehane, Ndivhuwo M ; Oxtoby, Oliver F ; Reddy, BD Date: Nov 2018 In this work, droplet–droplet interaction is modelled using a multi-scale approach which couples multiphase flow simulation using a volume of fluid method to a surface thin film model operating on the sub-grid scale. The volume of fluid model ... Read more
Phase effects in tap-hole flow – a computational modelling study

Author: Reynolds, QG ; Olsen, JE ; Erwee, MW ; Oxtoby, Oliver F Date: Jun 2019 The extraction of molten products and wastes through smelting furnace tap-holes during the tapping process is a complex procedure involving many coupled thermophysical effects. Insight into the fluid flow behaviour in such systems can be ... Read more
A weakly compressible formulation for modelling liquid-gas sloshing

Author: Heyns, Johan A ; Oxtoby, Oliver F ; Malan, AG Date: Sep 2012 This study presents the development and extension of free-surface modelling techniques with the purpose of improving the modelling accuracy for liquid-gas sloshing. Considering high density ratio fluids under low Mach number conditions, the ... Read more

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