95 citations · 416 across the 14 of their papers we have counts for
14 papers
A revisit of the development of viscoplastic flow in pipes and channels
Alexandros Syrakos, Evgenios Gryparis, Georgios C. Georgiou
This study revisits the development of viscoplastic flow in pipes and channels, focusing on the flow of a Bingham plastic. Using finite element simulations and the Papanastasiou re…
Analytical solution of the Poiseuille flow of a De Kee viscoplastic fluid
Alexandros Syrakos, Aggelos Charalambous, Georgios C. Georgiou
We provide an explicit analytical solution of the planar Poiseuille flow of a viscoplastic fluid governed by the constitutive equation proposed by De Kee and Turcotte (Chem. Eng. C…
A unification of least-squares and Green-Gauss gradients under a common projection-based gradient reconstruction framework
Alexandros Syrakos, Oliver Oxtoby, Eugene de Villiers +3
We propose a family of gradient reconstruction schemes based on the solution of over-determined systems by orthogonal or oblique projections. In the case of orthogonal projections,…
A family of first-order accurate gradient schemes for finite volume methods
Oliver Oxtoby, Alexandros Syrakos, Eugene de Villiers +3
A new discretisation scheme for the gradient operator, suitable for use in second-order accurate Finite Volume Methods (FVMs), is proposed. The derivation of this scheme, which we…
A finite volume method for the simulation of elastoviscoplastic flows and its application to the lid-driven cavity case
Alexandros Syrakos, Yannis Dimakopoulos, John Tsamopoulos
We propose a Finite Volume Method for the simulation of elastoviscoplastic flows, modelled after the extension to the Herschel-Bulkley model by Saramito [J. Non-Newton. Fluid Mech.…
Theoretical study of the flow in a fluid damper containing high viscosity silicone oil: effects of shear-thinning and viscoelasticity
Alexandros Syrakos, Yannis Dimakopoulos, John Tsamopoulos
The flow inside a fluid damper where a piston reciprocates sinusoidally inside an outer casing containing high-viscosity silicone oil is simulated using a Finite Volume method, at…
Thixotropic flow past a cylinder
Alexandros Syrakos, Georgios C. Georgiou, Andreas N. Alexandrou
We study the flow of a thixotropic fluid around a cylinder. The rheology of the fluid is described by means of a structural viscoplastic model based on the Bingham constitutive equ…
A critical analysis of some popular methods for the discretisation of the gradient operator in finite volume methods
Alexandros Syrakos, Stylianos Varchanis, Yannis Dimakopoulos +2
Finite volume methods (FVMs) constitute a popular class of methods for the numerical simulation of fluid flows. Among the various components of these methods, the discretisation of…
Viscoplastic flow in an extrusion damper
Alexandros Syrakos, Yannis Dimakopoulos, Georgios C. Georgiou +1
Numerical simulations of the flow in an extrusion damper are performed using a finite volume method. The damper is assumed to consist of a shaft, with or without a spherical bulge,…
Performance of the finite volume method in solving regularised Bingham flows: inertia effects in the lid-driven cavity flow
Alexandros Syrakos, Georgios C. Georgiou, Andreas N. Alexandrou
We extend our recent work on the creeping flow of a Bingham fluid in a lid-driven cavity, to the study of inertial effects, using a finite volume method and the Papanastasiou regul…
Solution of the square lid-driven cavity flow of a Bingham plastic using the finite volume method
Alexandros Syrakos, Georgios C. Georgiou, Andreas N. Alexandrou
We investigate the performance of the finite volume method in solving viscoplastic flows. The creeping square lid-driven cavity flow of a Bingham plastic is chosen as the test case…
Finite volume adaptive solutions using SIMPLE as smoother
Alexandros Syrakos, Apostolos Goulas
This paper describes a new multilevel procedure that can solve the discrete Navier-Stokes system arising from finite volume discretizations on composite grids, which may consist of…
Estimate of the truncation error of a finite volume discretisation of the Navier-Stokes equations on colocated grids
Alexandros Syrakos, Apostolos Goulas
A methodology is proposed for the calculation of the truncation error of finite volume discretisations of the incompressible Navier-Stokes equations on colocated grids. The truncat…
Numerical experiments on the efficiency of local grid refinement based on truncation error estimates
Alexandros Syrakos, Georgios Efthimiou, John G. Bartzis +1
Local grid refinement aims to optimise the relationship between accuracy of the results and number of grid nodes. In the context of the finite volume method no single local refinem…