Browsing by Author "Tsamopoulos, J."
Now showing items 1-7 of 7
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Article
Comparison of spectral and finite element methods applied to the study of the core-annular flow in an undulating tube
Kouris, C.; Dimakopoulos, Yannis; Georgiou, Georgios C.; Tsamopoulos, J. (2002)A Galerkin/finite element and a pseudo-spectral method, in conjunction with the primitive (velocity-pressure) and streamfunction-vorticity formulations, are tested for solving the two-phase flow in a tube, which has a ...
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Article
Hemodynamics in stenotic vessels of small diameter under steady state conditions: Effect of viscoelasticity and migration of red blood cells
Dimakopoulos, Yannis; Kelesidis, G.; Tsouka, S.; Georgiou, Georgios C.; Tsamopoulos, J. (2015)BACKGROUND: In microcirculation, the non-Newtonian behavior of blood and the complexity of the microvessel network are responsible for the high flow resistance and the large reduction of the blood pressure. Red blood cell ...
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Article
A new finite element formulation for viscoelastic flows: Circumventing simultaneously the LBB condition and the high-Weissenberg number problem
Varchanis, S.; Syrakos, Alexandros; Dimakopoulos, Y.; Tsamopoulos, J. (2019)In this paper, we propose a new, fully consistent and highly stable finite element formulation for the simulation of viscoelastic flows. In our method, we have implemented equal order interpolants for all variables and a ...
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Article
The PAL (Penalized Augmented Lagrangian) method for computing viscoplastic flows: A new fast converging scheme
Dimakopoulos, Y.; Makrigiorgos, G.; Georgiou, Georgios C.; Tsamopoulos, J. (2018)Computation of viscoplastic fluid flows has always been a challenging task. Viscoplastic models are intrinsically discontinuous at the yielded-unyielded interface, which leads to numerical difficulties, because of the ...
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Article
The steady annular extrusion of a Newtonian liquid under gravity and surface tension
Housiadas, Kostas D.; Georgiou, Georgios C.; Tsamopoulos, J. (2000)The steady extrusion of a Newtonian liquid through an annular die and its development outside and away from the die are studied under the influence of gravitational and surface tension forces. The finite element method ...
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Conference Object
Steady flow of a two-dimensional film under pressure
Georgiou, Georgios C.; Tsamopoulos, J.; Schultz, W. W. (2000)We use finite elements and the full Newton iteration method to solve the steady, two-dimensional flow of a Newtonian planar film, issuing from a slit under a pressure difference between the two free surfaces, in the presence ...
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Article
Viscoplastic flow in an extrusion damper
Syrakos, A.; Dimakopoulos, Yannis; Georgiou, Georgios C.; Tsamopoulos, J. (2016)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, oscillating axially in a containing ...