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Browsing by Subject "Turbulence"

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    • Conference Object  

      CFD modeling of turbulent flow and particle deposition in human lungs 

      Radhakrishnan, H.; Kassinos, Stavros C. (Affiliation: UCY-CompSci Computational Sciences Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, CyprusCorrespondence Address: Radhakrishnan, H.UCY-CompSci Computational Sciences Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, Cyprusemail: hariradh@ucy.ac.cy, 2009)
      Understanding transport and deposition of inhaled particles in the human airways plays a crucial role in the targeted therapy of pulmonary diseases, and the administration of inhaled medicines. Numerous researchers have ...

    • Article  

      Coherent structures in oscillating turbulent boundary layers over a fixed rippled bed 

      Grigoriadis, D. G. E.; Balaras, E.; Dimas, A. A. (2013)
      Coherent structures generated by oscillating turbulent boundary layers with or without a unidirectional current over a fixed, rippled bed are presented. The effect of ripple height and current intensity on the characteristics ...

    • Book  

      Complex effects in Large Eddy Simulations 

      Kassinos, Stavros C. (Springer, 2007)

    • Conference Object  

      Computational fluid dynamics (CFD) Simulations of aerosol deposition in the lungs 

      Koullapis, P. G.; Kassinos, Stavros C.; Lin, C.-L. (TSFP-9, 2015)
      In the current study, Large Eddy Simulations (LES) are used to investigate the transport and deposition of inhaled aerosol particles (dp = 0.1, 0.5, 1, 2.5, 5, 10 μm) in a realistic geometry of the human airways under ...

    • Article  

      The contribution of active and inactive structures to the statistics of a turbulent pipe flow 

      Stylianou, F. S.; Kassinos, Stavros C. (2017)
      The current study is a short follow-up to our most recent work (Stylianou et al., 2016), where among other things we have presented an effective criterion suitable for distinguishing large-scale coherent structures with ...

    • Article  

      Direct numerical simulation of turbulent liquid metal flow entering a magnetic field 

      Albets-Chico, X.; Grigoriadis, D. G. E.; Votyakov, E. V.; Kassinos, Stavros C. (2013)
      This paper presents direct numerical simulations (DNS) of fully developed turbulent liquid-metal flow in a circular duct entering a magnetic field. The case of a magnetohydrodynamic flow leaving a strong magnetic field has ...

    • Article  

      Dispersed-phase structural anisotropy in homogeneous magnetohydrodynamic turbulence at low magnetic Reynolds number 

      Rouson, D. I.; Kassinos, Stavros C.; Moulitsas, I.; Sarris, I. E.; Xu, X. (2008)
      A new tensor statistic, the dispersed-phase structure dimensionality Dp, is defined to describe the preferred orientation of clusters of discrete bodies. The evolution of Dp is calculated via direct numerical simulations ...

    • Conference Object  

      The effect of flow rate, head position, and inhaler orientation on the airflow and particle deposition in an mri-based mouth-throat geometry 

      Stylianou, F. S.; Angeli, S.; Kassinos, Stavros C.; Svensson, M. (International Symposium on Turbulence and Shear Flow Phenomena, TSFP10, 2017)
      The mouth-throat plays a key role in the administration of inhaled medicines. It is an area of intense filtration, where an unacceptably high fraction of the released drug dose is deposited and thus wasted. Due to the ...

    • Doctoral Thesis  Open Access

      Extensions to structure-based turbulence theory and models, with applications to internal and simple biological flows 

      Stylianou, Fotos S. (Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2016-12)
      Η Θεωρία Δομής της Τύρβης (ΘΔΤ) αποτελεί ένα ολοκληρωμένο μαθηματικό πλαίσιο, όπου η ποσοτικοποίηση των ποικίλων πτυχών των συνεκτικών δομών της τύρβης επιτυγχάνεται μέσω των Τανυστών Δομής της Τύρβης (ΤΔΤ). Αυτή η θεωρία ...

    • Conference Object  

      Fully turbulent flow in a physiologically realistic human airway bifurcation 

      Stylianou, F. S.; Kassinos, Stavros C. (TSFP-9, 2015)
      Recent computational studies have shown that the airflow in the upper human airways is turbulent during much of the respiratory cycle. A feature of respiratory airflow that poses a challenge to computations based on ...

    • Article  

      Large Eddy Simulation of near-bed pipelines in oscillatory flow 

      Fonias, E. N.; Grigoriadis, D. G. E. (2018)
      A series of unsteady, three-dimensional numerical simulations of the incompressible, oscillatory flow around a near-bed pipeline is presented. A flow at Reynolds number equal to Reαo=20,000 with respect to the oscillatory ...

    • Article  

      Large-eddy simulation of wave turbulent boundary layer over rippled bed 

      Grigoriadis, D. G. E.; Dimas, A. A.; Balaras, E. (2012)
      Large-eddy simulation (LES) of turbulent boundary layer induced by external oscillatory flow without or with a unidirectional component over rippled bottom is presented. These flows represent prototype turbulent flows of ...

    • Article  

      Magnetohydrodynamic turbulence at moderate magnetic Reynolds number 

      Knaepen, B.; Kassinos, Stavros C.; Carati, D. (2004)
      We consider the case of homogeneous turbulence in a conducting fluid that is exposed to a uniform external magnetic field at low to moderate magnetic Reynolds numbers (by moderate we mean here values as high as 20). When ...

    • Conference Object  

      Numerical modeling of turbulent airflow and particle deposition in a bifurcating airway model 

      Radhakrishnan, H.; Kassinos, Stavros C. (Affiliation: UCY-CompSci Computational Sciences Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, CyprusCorrespondence Address: Radhakrishnan, H.UCY-CompSci Computational Sciences Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, Cyprus, 2009)
      Understanding transport and deposition of inhaled particles in the human airways plays a crucial role in the targeted therapy of pulmonary diseases, and the administration of inhaled medicines. Numerous researchers have ...

    • Conference Object  

      Numerical simulations of turbulent flow in an eccentric annulus of unit eccentricity 

      Kanaris, N.; Albets-Chico, X.; Kassinos, Stavros C. (TSFP-9, 2015)
      In this study, we perform Direct Numerical Simulations (DNS) of fully developed turbulent flows in eccentric annuli having different diameter ratios. Annuli of unit eccentricity, and diameter ratios of 0.2591 and 0.1395 ...

    • Article  

      Rapid shear of initially anisotropic turbulence in a rotating frame? 

      Akylas, Evaggelos; Kassinos, Stavros C.; Langer, C. A. (2007)
      In the present study, we investigate, using inviscid rapid distortion theory, the evolution of sheared turbulence in a rotating frame as a function of the rotation rate (including stable, transitional, and unstable regimes), ...

    • Article  

      Rapidly sheared homogeneous stratified turbulence in a rotating frame 

      Kassinos, Stavros C.; Akylas, Evaggelos; Langer, C. A. (2007)
      Rapid distortion theory is applied to stratified homogeneous turbulence that is sheared in a rotating frame. Insight into the stabilizing and destabilizing effects of the combined stratification and frame rotation is gained ...

    • Article  

      Representing anisotropy of two-point second-order turbulence velocity correlations using structure tensors 

      Bhattacharya, A.; Kassinos, Stavros C.; Moser, R. D. (2008)
      A locally homogeneous representation for the two-point, second-order turbulent velocity fluctuation Rij(x,r) = 〈u′i(x)u′i(x+r)〉 is formulated in terms of three linearly independent structure tensors [Kassinos et al., J. ...

    • Article  

      A simplified structure-based model using standard turbulence scale equations: computation of rotating wall-bounded flows 

      Kassinos, Stavros C.; Langer, C. A.; Kalitzin, G.; Iaccarino, G. (2006)
      Two linear eddy-viscosity models, the v2-f and k-ω models, have been combined with an algebraic structure-based algorithm for the evaluation of the Reynolds stresses. This closure was originally designed as an integral ...

    • Article  

      Statistical measures of structural anisotropy in MHD turbulence subjected to mean shear and frame rotation 

      Kassinos, Stavros C.; Knaepen, B.; Wray, A. (2006)
      We consider homogeneous turbulence in a conducting fluid that is exposed to a uniform external magnetic field while being sheared in fixed and rotating frames. We take both the frame-rotation axis and the applied magnetic ...

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