Browsing by Subject "Turbulence"

Now showing items 21-29 of 29

    • Article  

      Structure and scales in turbulence modeling 

      Reynolds, W. C.; Langer, C. A.; Kassinos, Stavros C. (2002)
      The enstrophy of the large-scale energy-containing turbulence is proposed as the second turbulence scale for use, in conjunction with the turbulence energy, in two-scale one-point engineering turbulence models. Its transport ...
    • Article  

      A structure-based model for the transport of passive scalars in homogeneous turbulent flows 

      Panagiotou, C. F.; Kassinos, Stavros C. (2016)
      A structure-based model has been constructed, for the first time, for the study of passive scalar transport in turbulent flows. The scalar variance and the large-scale scalar gradient variance are proposed as the two ...
    • Article  

      A structure-based model for transport in stably stratified homogeneous turbulent flows 

      Panagiotou, C. F.; Kassinos, Stavros C. (2017)
      We present an extension that allows a recently proposed structure-based model for turbulent scalar transport to account for buoyancy effects. The proposed model is based on a generalization of the Interactive Particle ...
    • Doctoral Thesis  Open Access

      Structure-based turbulence models : inclusion of additional physics and development of improved engineering closures 

      Panagiotou, Constantinos F. (Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2016-01)
      Τα δομικά μοντέλα (SBMs) περιέχουν πληροφορίες σχετικά με τη δομή της τύρβης, πληροφορίες οι οποίες χρειάζονται για τη σωστή πρόβλεψη των πολύπλοκων και ασταθών τυρβώδων ροών. Μολονότι τα δομικά μοντέλα έχουν χρησιμοποιηθεί ...
    • Article  

      Thermal conduction in magnetized turbulent gas 

      Cho, J.; Lazarian, A.; Honein, A.; Knaepen, B.; Kassinos, Stavros C.; Moin, P. (2003)
      Using numerical methods, we systematically study in the framework of ideal MHD the effect of magnetic fields on heat transfer within a turbulent gas. We measure the rates of passive scalar diffusion within magnetized fluids ...
    • Doctoral Thesis  Open Access

      Three-dimensional direct numerical simulations of hydrodynamic and magnetohydrodynamic flows over an obstacle in a confined geometry 

      Kanaris, Nicolas A. (Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2012-12)
      Στην παρούσα διατριβή παρουσιάζεται η υδροδυναμική και μαγνητοϋδροδυναμική ροή που αναπτύσσεται γύρω από ένα κύλινδρο κυκλικής διατομής, σε γεωμετρίες περιορισμένες από σταθερά τοιχώματα. Η επίδραση του περιορισμού της ...
    • 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 ...
    • Article  

      The transport of a passive scalar in magnetohydrodynamic turbulence subjected to mean shear and frame rotation 

      Kassinos, Stavros C.; Knaepen, B.; Carati, D. (2007)
      We consider the transport of a passive scalar under the influence of homogeneous turbulence in a conducting fluid that is exposed to a uniform external magnetic field while being sheared in fixed and rotating frames. The ...
    • Doctoral Thesis  Open Access

      Understanding and modelling of multiscale phenomena in the urban atmosphere 

      Mouzourides, Petros A. (Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2018-01)
      Η διατριβή αφορά τη μελέτη αλληλεπίδρασης μεταξύ των φυσικών διεργασιών στην ατμόσφαιρα και παράλληλα η εισήγηση μεθόδων ώστε τα διάφορα προγνωστικά μοντέλα ατμοσφαιρικής ροής να μοντελοποιούν με συνεκτικό τρόπο αυτές τις ...