• Article  

      Compressible viscous flow in slits with slip at the wall 

      Georgiou, Georgios C.; Crochet, M. J. (1994)
      We study the time-dependent compressible flow of a Newtonian fluid in slits using an arbitrary nonlinear slip law relating the shear stress to the velocity at the wall. This slip law exhibits a maximum and a minimum and ...
    • Article  

      Compression molding using a generalized eulerian–lagrangian formulation with automatic remeshing 

      Ahmed, A.; Alexandrou, Andreas N. (1992)
      A generalized Eulerian‐Lagrangian approach is used to study the compression molding of viscoelastic polymers. The complete, unsteady, two‐dimensional equations of motion are used in the analysis. The White–Metzner model ...
    • Article  

      Inertial, viscous and yield stress effects in Bingham fluid filling of a 2-D cavity 

      Alexandrou, Andreas N.; Duc, E.; Entov, V. (2001)
      The present study concentrates on Bingham fluid filling of a 2-D cavity and examines the relative importance of inertial, viscous and yield stress effects on the filling profile. The results presented are obtained using ...
    • Article  

      Mechanism for extrusion instabilities in polymer melts 

      Fyrillas, Marios M.; Georgiou, Georgios C.; Vlassopoulos, Dimitris; Hatzikiriakos, Savvas George (1999)
      A mechanism for explaining some of the instabilities observed during the extrusion of polymer melts is further explored. This is based on the combination of non-monotonic slip and elasticity, which permits the existence ...
    • 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 ...
    • Article  

      Transformation properties of a variable-coefficient Burgers equation 

      Sophocleous, Christodoulos (2004)
      In this paper we consider the variable coefficient equation u t=b(t)uux+a(t)uxx which among other applications has considerable interest in nonlinear acoustics. We present transformation properties of this generalised ...
    • Book  

      Viscous fluid flow 

      Παπαναστασίου, Τάσος; Γεωργίου, Γεώργιος; Αλεξάνδρου, Ανδρέας Ν (Crc, 2000)