• Article  

      On numerical simulations of polymer extrusion instabilities 

      Achilleos, Evdokia C.; Georgiou, Georgios C.; Hatzikiriakos, Savvas George (2002)
      The objective of this study is mainly to review recent work concerning the numerical modeling of the stick-slip and gross melt fracture polymer extrusion instabilities. Three different mechanisms of instability are discussed: ...
    • Article  

      The simultaneous use of 4×4 and 2×2 bilinear stress elements for viscoelastic flows 

      Georgiou, Georgios C.; Crochet, M. J. (1993)
      Mixed finite elements for viscoelastic flows based on a 4×4 sub-linear interpolation for the extra stress components satisfy the Babuska-Brezzi condition and are highly stable. They have been proved to be quite satisfactory ...