Browsing by Author "Dimakopoulos, Y."
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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 ...