Browsing by Author "Lehmkuhl, Oriol"
Now showing items 1-20 of 21
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A level-set aided single-phase model for the numerical simulation of free-surface flow on unstructured meshes
(Elsevier, 2016-11-25)
Article
Open AccessA new single-phase scheme for the numerical simulation of free-surface problems on 3-D unstructured meshes is presented. The flow field is obtained from the discrete solution of the incompressible Navier-Stokes equations, ... -
A low-dissipation finite element scheme for scale resolving simulations of turbulent flows
(2019-08-01)
Article
Restricted access - publisher's policyThe present work extends the conservative convective scheme proposed by Charnyi et al. (2017) [13], originally formulated for mixed finite elements and tested in laminar flows, to equal order finite elements. A non-incremental ... -
Boundary layer flow control using synthetic jets on the flow over a NACA 0012 airfoil
(2017)
Conference report
Restricted access - publisher's policyNumerical simulations of the flow control using a synthetic jet are presented. The flow considered is around a NACA 0012 airfoil at Re = 5000 and the actuator is located at 6% of the chord from the leading edge. This work ... -
Direct numerical simulation of multiphase flows with unstable interfaces
(Institute of Physics (IOP), 2016-09-01)
Article
Open AccessThis paper presents a numerical model that intends to simulate efficiently the surface instability that arise in multiphase flows, typically liquid-gas, both for laminar or turbulent regimes. The model is developed on the ... -
Evaluating the roles of detailed endocardial structures on right ventricular haemodynamics by means of CFD simulations
(Wiley, 2018-09)
Restricted access - publisher's policyComputational modelling plays an important role in right ventricular (RV) haemodynamic analysis. However, current approaches use smoothed ventricular anatomies. The aim of this study is to characterise RV haemodynamics ... -
Large eddy simulation for automotive aerodynamics with Alya
(2018-07-09)
Conference lecture
Open AccessThe prodigious potential offered by the ever-growing computing infrastructure is fostering the use of large eddy simulation for automotive aerodynamics. This approach, which resolves the larger dynamically important eddies ... -
Large eddy simulation of a turbulent diffusion flame: some aspects of subgrid modelling consistency
(2017-04-26)
Article
Open AccessIn the context of Large Eddy Simulation (LES) solely for the momentum transport equation there may be found several models for the turbulent subgrid fluxes. Furthermore, among those relying on the eddy diffusivity approach, ... -
Large-eddy simulations of the vortex-induced vibration of a low mass ratio two-degree-of-freedom circular cylinder at subcritical Reynolds numbers
(Elsevier, 2018-09)
Article
Restricted access - publisher's policyThe vortex induced vibration phenomenon of a low mass ratio () two-degree-of-freedom circular cylinder at subcritical Reynolds numbers ( 5300, 11,000) has been investigated by means of large-eddy simulations. A low-dissipative ... -
Left Ventricular Trabeculations Decrease the Wall Shear Stress and Increase the Intra-Ventricular Pressure Drop in CFD Simulations
(Frontiers Media, 2018-04-30)
Article
Open AccessThe aim of the present study is to characterize the hemodynamics of left ventricular (LV) geometries to examine the impact of trabeculae and papillary muscles (PMs) on blood flow using high performance computing (HPC). ... -
LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
(Springer Verlag, 2017-12)
Article
Open AccessThis paper investigates the effects of surface roughness on the flow past a circular cylinder at subcritical to transcritical Reynolds numbers. Large eddy simulations of the flow for sand grain roughness of size k/D = 0.02 ... -
Noise Radiated by an Open Cavity at Low Mach Number
(2018)
Conference report
Restricted access - publisher's policyThe present work focuses on the study of noise generation and radiation of unsteady laminar flow over an open three dimensional cavity at low Mach number, that is of interest to understand noise generation mechanisms in ... -
Numerical analysis of conservative unstructured discretisations for low Mach flows
(2016-12-01)
Article
Open AccessUnstructured meshes allow easily representing complex geometries and to refine in regions of interest without adding control volumes in unnecessary regions. However, numerical schemes used on unstructured grids have to ... -
Numerical simulation of roughness effects on the flow past a circular cylinder
(Institute of Physics (IOP), 2016)
Conference report
Open AccessIn the present work large eddy simulations of the flow past a rough cylinder are performed at a Reynolds number of Re = 4.2 × 105 and an equivalent sand-grain surface roughness height ks = 0.02D. In order to determine the ... -
On the boundary layer development and heat transfer from a sphere at moderate Reynolds numbers
(2018)
Conference report
Restricted access - publisher's policyDirect and large-eddy numerical simulations have been performed for a heated sphere at Reynolds numbers 200, 300, 500, 750, 1000 and 104, in the context of the development of a spherical wind sensor for Mars atmosphere ... -
On the effects of free-stream turbulence intensity in the fluid flow and heat transfer from a sphere at subcritical Reynolds numbers
(2018)
Conference lecture
Restricted access - publisher's policyIn this work, the effect of the free-stream turbu-lence on the heat transfer and the near wake behind a sphere is studied at moderate Reynolds numbers of ¿¿ ¿ ¿¿¿¿ and ¿¿ ¿ ¿¿¿. Turbulence delays the sep-aration of the ... -
On the role of a centrifugal instability in the vortex-induced vibration of a two-degrees of freedom circular cylinder at moderate Reynolds numbers
(2018)
Conference report
Restricted access - publisher's policyIn this work, the formation and role of a centrifugal instability in the VIV phenomenon at moderate Reynolds numbers are investigated for the ¿rst time. Large eddy simulations of a low mass ratio (m = 2.6) two-degree-of-freedom ... -
Regional aerosol deposition in the human airways: the SimInhale benchmark case and a critical assessment of in silico methods
(2017-09-07)
Article
Open AccessRegional deposition effects are important in the pulmonary delivery of drugs intended for the topical treatment of respiratory ailments. They also play a critical role in the systemic delivery of drugs with limited lung ... -
Regional aerosol deposition in the human airways: The SimInhale benchmark case and a critical assessment of in silico methods
(Elsevier, 2018-02-15)
Article
Open AccessRegional deposition effects are important in the pulmonary delivery of drugs intended for the topical treatment of respiratory ailments. They also play a critical role in the systemic delivery of drugs with limited lung ... -
Subject-variability effects on micron particle deposition in human nasal cavities
(Elsevier, 2018-01)
Article
Open AccessValidated computer simulations of the airflow and particle dynamics in human nasal cavities are important for local, segmental and total deposition predictions of both inhaled toxic and therapeutic particles. Considering ... -
Thermo-mechanical parametric analysis of packed-bed thermocline energy storage tanks
(2016-10-01)
Article
Open AccessA packed-bed thermocline tank represents a proved cheaper thermal energy storage for concentrated solar power plants compared with the commonly-built two-tank system. However, its implementation has been stopped mainly due ...
