Browsing by Subject "Computational fluid dynamics"

Now showing items 1-20 of 40

    • Doctoral Thesis  Open Access

      Accelerating CFD simulations of two-fluid flows : application in numerical wave tanks 

      Frantzis, Charalambos M. (Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2019-12)
      Η κατανόηση κυματογενών ροών και η αλληλεπίδρασή τους με κατασκευές στο παράκτιο και ωκαιάνειο/υπεράκτιο περιβάλλον είναι αρκετά σημαντική, για την επίτευξη αποτελεσματικότερων σχεδιασμών. Η μελέτη πολύπλοκων προβλημάτων ...
    • Conference Object  

      Altitude and velocity tracking control for an airbreathing hypersonic cruise vehicle 

      Huo, Y.; Mirmirani, M.; Ioannou, Petros A.; Kuipers, M. (2006)
      This paper describes an adaptive linear quadratic (ALQ) altitude and velocity tracking control algorithm for the longitudinal model of a generic airbreathing hypersonic flight vehicle hypersonic flight vehicle. The vehicle ...
    • Article  

      Analytic models of heterogenous magnetic fields for liquid metal flow simulations 

      Votyakov, E. V.; Kassinos, Stavros C.; Albets-Chico, X. (2009)
      A physically consistent approach is considered for defining an external magnetic field as needed in computational fluid dynamics problems involving magnetohydrodynamics (MHD). The approach results in simple analytical ...
    • Article  

      The ASBM-SA turbulence closure: Taking advantage of structure-based modeling in current engineering CFD codes 

      Panagiotou, C. F.; Kassinos, Stavros C.; Aupoix, B. (2015)
      Structure-based turbulence models (SBM) carry information about the turbulence structure that is needed for the prediction of complex non-equilibrium flows. SBM have been successfully used to predict a number of canonical ...
    • Article  

      Cessation of Couette and Poiseuille flows of a Bingham plastic and finite stopping times 

      Chatzimina, Maria Evangelia; Georgiou, Georgios C.; Argyropaidas, Ioannis; Mitsoulis, Evan C.; Huilgol, R. R. (2005)
      We solve the one-dimensional cessation Couette and Poiseuille flows of a Bingham plastic using the regularized constitutive equation proposed by Papanastasiou and employing finite elements in space and a fully implicit ...
    • 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 ...
    • 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 particle laden flow in a human airway bifurcation model 

      Stylianou, F. S.; Sznitman, J.; Kassinos, Stavros C. (2016)
      During the delivery of inhaled medicines, and depending on the size distribution of the particles in the formulation, airway bifurcations are areas of preferential deposition. Previous studies of laminar flow through airway ...
    • 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 ...
    • Article  

      Effect of head posture on the healthy human carotid bifurcation hemodynamics 

      Papaharilaou, Yannis; Aristokleous, Nicolas; Seimenis, Ioannis; Khozeymeh, M. I.; Georgiou, Georgios C.; Brott, B. C.; Eracleous, Eleni A.; Anayiotos, Andreas S. (2013)
      Head and neck postures may cause morphology changes to the geometry of the carotid bifurcation (CB) that alter the low and oscillating wall shear stress (WSS) regions previously reported as important in the development of ...
    • Article  

      The Effect of Head Rotation on the Geometry and Hemodynamics of Healthy Vertebral Arteries 

      Aristokleous, Nicolas; Seimenis, Ioannis; Georgiou, Georgios C.; Nicolaïdes, Andrew N.; Anayiotos, Andreas S. (2015)
      The geometric and hemodynamic characteristics of the left and right vertebral arteries (LVA, RVA) of six healthy volunteers were investigated for the supine (S) and the prone position (P) a common sleeping posture with ...
    • Conference Object  

      Effect of posture change on the geometric features of the healthy carotid bifurcation 

      Aristokleous, Nicolas; Seimenis, Ioannis; Papaharilaou, Yannis; Georgiou, Georgios C.; Brott, B. C.; Anayiotos, Andreas S. (2009)
      Segmented cross sectional MRI images were used to construct 3D virtual models of the carotid bifurcation in 5 healthy volunteers. Geometric features such as bifurcation angle, planarity angle, asymmetry angle tortuosity ...
    • Article  

      Effect of posture change on the geometric features of the healthy carotid bifurcation 

      Aristokleous, Nicolas; Seimenis, Ioannis; Papaharilaou, Yannis; Georgiou, Georgios C.; Brott, B. C.; Eracleous, Eleni A.; Anayiotos, Andreas S. (2011)
      Segmented cross-sectional MRI images were used to construct 3-D virtual models of the carotid bifurcation in ten healthy volunteers. Geometric features, such as bifurcation angle, internal carotid artery (ICA) angle, ...
    • Conference Object  

      Effect of turbulent pulsating flow around a near-wall submerged cylinder on the potential motion of bed and suspended loads 

      Fonias, E. N.; Grigoriadis, D. G. E. (International Society of Offshore and Polar Engineers, 2016)
      In the present work, the pulsating flow around a submerged cylinder close to the impermeable seabed is examined by means of Large Eddy Simulations (LES). A Reynolds number equal to Re = 5000 is considered, based on the ...
    • Article  

      Efficient implementation of the MFS: The three scenarios 

      Smyrlis, Yiorgos-Sokratis; Karageorghis, Andreas (2009)
      In this study we investigate the approximation of the solutions of harmonic problems subject to Dirichlet boundary conditions by the Method of Fundamental Solutions (MFS). In particular, we study the application of the MFS ...
    • Article  

      Flow development in compression of a finite amount of a Bingham plastic 

      Florides, G. C.; Alexandrou, Andreas N.; Georgiou, Georgios C. (2007)
      The flow and shape evolution during the compression of a finite amount of a Bingham plastic is investigated by means of numerical simulations. The problem relates to the popular compression test used for the rheological ...
    • Article  

      Flow development in compression of a finite amount of a Bingham plastic 

      Florides, G. C.; Alexandrou, Andreas N.; Georgiou, G. C. (2007)
      The flow and shape evolution during the compression of a finite amount of a Bingham plastic is investigated by means of numerical simulations. The problem relates to the popular compression test used for the rheological ...
    • 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 ...