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Browsing by Subject "Incompressible flow"

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    • Article  

      Combined effects of compressibility and slip in flows of a Herschel-Bulkley fluid 

      Damianou, Y.; Georgiou, Georgios C.; Moulitsas, I. (2013)
      In this work, the combined effects of compressibility and slip in Poiseuille flows of Herschel-Bulkley fluids are investigated. The density is assumed to obey a linear equation of state, and wall slip is assumed to follow ...

    • 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 ...

    • Article  

      Efficient treatment of complex geometries for large eddy simulations of turbulent flows 

      Grigoriadis, D. G. E.; Bartzis, J. G.; Goulas, A. (2004)
      Incompressible turbulent flow over a backward facing step at Reh=5100 is investigated by large eddy simulations (LES). The ratio of the oncoming boundary layer thickness δ to the step height h was set to 1.2. Additionally ...

    • Article  

      Immersed boundary method for the MHD flows of liquid metals 

      Grigoriadis, D. G. E.; Kassinos, Stavros C.; Votyakov, E. V. (2009)
      Wall-bounded magnetohydrodynamic (MHD hereafter) flows are of great theoretical and practical interest. Even for laminar cases, MHD simulations are associated with very high computational cost due to the resolution ...

    • Article  

      Lagrangian particle dispersion in turbulent flow over a wall mounted obstacle 

      Grigoriadis, D. G. E.; Kassinos, Stavros C. (2009)
      Large-eddy simulations (LES) of particle-laden turbulent flows are presented in order to investigate the effects of particle response time on the dispersion patterns of a space developing flow with an obstruction, where ...

    • Conference Object  

      Large eddy simulation of sediment transport for the pulsating flow past a cylinder over a horizontal bed 

      Fonias, E. N.; Grigoriadis, D. G. E. (International Society of Offshore and Polar Engineers, 2015)
      In the present work, the suspended, pulsating incompressible flow past a submerged cylinder was examined by means of Large Eddy Simulations (LES). A layer of sandy inertial particles was allowed to move between the cylinder ...

    • Article  

      LES of the flow past a rectangular cylinder using the immersed boundary concept 

      Grigoriadis, D. G. E.; Bartzis, J. G.; Goulas, A. (2003)
      Incompressible turbulent flow past a long square cylinder is investigated using large eddy simulations LES). Results are presented and compared with available experimental databases for a Reynolds number Red = 22 000. The ...

    • 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  

      New analytical solutions for weakly compressible Newtonian Poiseuille flows with pressure-dependent viscosity 

      Housiadas, Kostas D.; Georgiou, Georgios C. (2016)
      Steady-state, isothermal, Poiseuille flows in straight channels and circular tubes of weakly compressible Newtonian fluids are considered. The major assumption is that both the mass density and the shear viscosity of the ...

    • Article  

      A note on the unbounded creeping flow past a sphere for Newtonian fluids with pressure-dependent viscosity 

      Housiadas, Kostas D.; Georgiou, Georgios C.; Tanner, R. I. (2015)
      We investigate theoretically isothermal, incompressible, creeping Newtonian flows past a sphere, under the assumption that the shear viscosity is pressure-dependent, varying either linearly or exponentially with pressure. ...

    • Article  

      On the combined effects of slip, compressibility, and inertia on the Newtonian extrudate-swell flow problem 

      Kountouriotis, Zacharias; Georgiou, Georgios C.; Mitsoulis, Evan C. (2013)
      We solve both the planar and axisymmetric extrudate-swell flows of a compressible Newtonian liquid with Navier slip at the wall, using the finite-element method in space and a fully-implicit finite-difference scheme in ...

    • Article  

      Weakly compressible Poiseuille flows of a Herschel-Bulkley fluid 

      Taliadorou, Eleni G.; Georgiou, Georgios C.; Moulitsas, I. (2009)
      In this work, we derive approximate semi-analytical solutions of the steady, creeping, weakly compressible plane and axisymmetric Poiseuille flows of a Herschel-Bulkley fluid. Since the flow is weakly compressible, the ...

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