Browsing by Subject "Computational fluid dynamics"
Now showing items 120 of 25

Article
Analytic models of heterogenous magnetic fields for liquid metal flow simulations
(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 ASBMSA turbulence closure: Taking advantage of structurebased modeling in current engineering CFD codes
(2015)Structurebased turbulence models (SBM) carry information about the turbulence structure that is needed for the prediction of complex nonequilibrium flows. SBM have been successfully used to predict a number of canonical ...

Conference Object
CFD modeling of turbulent flow and particle deposition in human lungs
(Affiliation: UCYCompSci Computational Sciences Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, CyprusCorrespondence Address: Radhakrishnan, H.UCYCompSci 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
(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
(TSFP9, 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
(2017)The current study is a short followup to our most recent work (Stylianou et al., 2016), where among other things we have presented an effective criterion suitable for distinguishing largescale coherent structures with ...

Article
Direct numerical simulation of particle laden flow in a human airway bifurcation model
(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 mribased mouththroat geometry
(International Symposium on Turbulence and Shear Flow Phenomena, TSFP10, 2017)The mouththroat 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 ...

Conference Object
Effect of turbulent pulsating flow around a nearwall submerged cylinder on the potential motion of bed and suspended loads
(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
Flow development in compression of a finite amount of a Bingham plastic
(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
(TSFP9, 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
A gridfree abstraction of the NavierStokes equations in Fortran 95/2003
(2008)Computational complexity theory inspires a gridfree abstraction of the NavierStokes equations in Fortran 95/2003. A novel complexity analysis estimates that structured programming time grows at least quadratically with ...

Article
Lagrangian particle dispersion in turbulent flow over a wall mounted obstacle
(2009)Largeeddy simulations (LES) of particleladen 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 ...

Article
Large Eddy Simulation of nearbed pipelines in oscillatory flow
(2018)A series of unsteady, threedimensional numerical simulations of the incompressible, oscillatory flow around a nearbed pipeline is presented. A flow at Reynolds number equal to Reαo=20,000 with respect to the oscillatory ...

Conference Object
Large eddy simulation of sediment transport for the pulsating flow past a cylinder over a horizontal bed
(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
Largeeddy simulation of wave turbulent boundary layer over rippled bed
(2012)Largeeddy 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
MHD flow past a circular cylinder using the immersed boundary method
(2010)The immersed boundary method (IB hereafter) is an efficient numerical methodology for treating purely hydrodynamic flows in geometrically complicated flowdomains. Recently Grigoriadis et als. [1] proposed an extension of ...

Article
Numerical simulations of constantinflux gravity currents in confined spaces: Application to thermal storage tanks
(2016)This study uses Computational Fluid Dynamics (CFD) to investigate numerically the flow phenomena in the intrusion region of a thermal storage water tank during discharge. The early times of the discharging process have ...

Article
Numerical simulations of turbulent flows within an infinite array of randomly placed cylinders
(2018)We address the task of modelling numerically turbulent flows within random arrays of circular cylinders, relevant for several industrial and environmental applications. Numerical simulations are employed to model infinite ...

Article
On the transition to turbulence of a viscoplastic fluid past a confined cylinder: A numerical study
(2015)Threedimensional direct numerical simulations of a Bingham fluid flowing past a confined circular cylinder have been used in order to investigate viscoplastic effects in the waketransition regime. The case of a cylinder ...