Darcy-Weisbach friction factor at the nanoscale: From atomistic calculations to continuum models

A Liakopoulos, F Sofos, TE Karakasidis - Physics of Fluids, 2017 - pubs.aip.org
A modification of the Darcy-Weisbach friction factor applicable to nanoscale liquid transport
processes is proposed. Non-equilibrium molecular dynamics simulations allow us to access …

Stresses of PTT, Giesekus, and Oldroyd-B fluids in a Newtonian velocity field near the stick-slip singularity

JD Evans, IL Palhares Junior, CM Oishi - Physics of Fluids, 2017 - pubs.aip.org
We characterise the stress singularity of the Oldroyd-B, Phan-Thien–Tanner (PTT), and
Giesekus viscoelastic models in steady planar stick-slip flows. For both PTT and Giesekus …

[HTML][HTML] A mathematical model for a steady-state seepage flow of groundwater under a reinforced concrete dam

MC Elliotis - Applied Computing and Geosciences, 2019 - Elsevier
A numerical technique is applied to solve a biharmonic equation problem of a steady-state
seepage flow of water through a thin layer of soil, under an impermeable dam. Due to the …

Numerical study of the stress singularity in stick-slip flow of the Phan-Thien Tanner and Giesekus fluids

JD Evans, JA Cuminato, IL Palhares Junior… - Physics of …, 2019 - pubs.aip.org
Stick-slip flow is a challenging viscoelastic benchmark problem due to the presence of a
separation or transition point at the die exit where a sudden change in flow boundary …

A singular function boundary integral method for Laplacian problems with boundary singularities

C Xenophontos, M Elliotis, G Georgiou - SIAM Journal on Scientific Computing, 2006 - SIAM
A singular function boundary integral method for Laplacian problems with boundary
singularities is analyzed. In this method, the solution is approximated by the truncated …

The extrudate swell singularity of Phan-Thien–Tanner and Giesekus fluids

JD Evans, ML Evans - Physics of Fluids, 2019 - pubs.aip.org
The stress singularity for Phan-Thien–Tanner (PTT) and Giesekus viscoelastic fluids is
determined for extrudate swell (commonly termed die swell). In the presence of a Newtonian …

The singular function boundary integral method for an elastic plane stress wedge beam problem with a point boundary singularity

MC Elliotis, DC Charmpis, GC Georgiou - Applied Mathematics and …, 2014 - Elsevier
The singular function boundary integral method (SFBIM) is applied for the numerical solution
of a 2-D Laplace model problem of a perfectly elastic wedge beam under plane stress …

The singular function boundary integral method for biharmonic problems with crack singularities

M Elliotis, G Georgiou, C Xenophontos - Engineering analysis with …, 2007 - Elsevier
We use the singular function boundary integral method (SFBIM) to solve two model fracture
problems on the plane. In the SFBIM, the solution is approximated by the leading terms of …

On the stick-slip flow from slit and cylindrical dies of a Phan-Thien and Tanner fluid model. I. Steady state

G Karapetsas, J Tsamopoulos - Physics of Fluids, 2009 - pubs.aip.org
The steady planar and cylindrical stick-slip flows for a viscoelastic fluid are computed using
the Phan-Thien and Tanner (PTT) constitutive model. The mixed finite element method is …

The singular function boundary integral method for 3-D Laplacian problems with a boundary straight edge singularity

E Christodoulou, M Elliotis, C Xenophontos… - Applied Mathematics …, 2012 - Elsevier
Three-dimensional Laplace problems with a boundary straight-edge singularity caused by
two intersecting flat planes are considered. The solution in the neighbourhood of the straight …