Browsing by Subject "Fluid dynamics"
Now showing items 1-20 of 247
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A 8-neighbor model lattice Boltzmann method applied to mathematical-physical equations
(2016-10-26)
Article
Open AccessA lattice Boltzmann method (LBM) 9-bit model is presented to solve mathematical-physical equations, such as, Laplace equation, Poisson equation, Wave equation and Burgers equation. The 9-bit model has been verified by ... -
A dynamic load balancing method for the evaluation of chemical reaction rates in parallel combustion simulations
(Elsevier, 2019-08-15)
Article
Open AccessThe development and assessment of an efficient parallelization method for the evaluation of reaction rates in combustion simulations is presented. Combustion simulations where the finite-rate chemistry model is employed ... -
A fast and accurate method to solve the incompressible Navier-Stokes equations
(2013-02)
Article
Restricted access - publisher's policyPurpose: The purpose of this paper is to highlight the possibilities of a novel Lagrangian formulation in dealing with the solution of the incompressible Navier-Stokes equations with very large time steps. Design/meth ... -
A FEM-DEM technique for studying the motion of particles in non-Newtonian fluids: application to the transport of drill cuttings in wellbores
(Springer, 2015-11)
Article
Open AccessWe present a procedure for coupling the finite element method (FEM) and the discrete element method (DEM) for analysis of the motion of particles in non-Newtonian fluids. Particles are assumed to be spherical and immersed ... -
A first estimate for a pressure-retarded osmosis-driven thermosyphon
(2017-12-01)
Article
Open AccessPressure retarded osmosis (PRO) process and its significance for thermosyphon technology is discussed. In previous work the possibility to drive a thermosyphon by difference of densities from induced salinity gradients ... -
A first study on an oscillatory flow enclosed in a finite cylinder
(Universitat Politècnica de Catalunya, 2009-09-14)
Master thesis
Open AccessIn this preliminar work, an oscillatory flow contained in a closed cylinder is investigated by means of spectral methods. The problem is quite related with the Stokes boundary layer and the major phenomena belong to this ... -
A fluid-structure interaction solver for the fluid flow through reed type valves
(Institute of Physics (IOP), 2017)
Conference lecture
Open AccessSuction and discharge processes with self actuated valves have a major influence in efficiency and reliability of hermetic reciprocating compressors. Understanding the operation completely in order to enhance compressor's ... -
A level-set method for thermal motion of bubbles and droplets
(Institute of Physics (IOP), 2016)
Conference report
Open AccessA conservative level-set model for direct simulation of two-phase flows with thermocapillary effects at dynamically deformable interface is presented. The Navier-Stokes equations coupled with the energy conservation equation ... -
A level-set model for thermocapillary motion of deformable fluid particles
(2016-12-01)
Article
Open AccessA new level-set model is proposed for simulating immiscible thermocapillary flows with variable fluid-property ratios at dynamically deformable interfaces. The Navier–Stokes equations coupled with the energy conservation ... -
A low-dissipation convection scheme for the stable discretization of turbulent interfacial flow
(Elsevier, 2017-08-10)
Article
Open AccessThis paper analyzes a low-dissipation discretization for the resolution of immiscible, incompressible multiphase flow by means of interface-capturing schemes. The discretization is built on a three-dimensional, unstructured ... -
A negative reactivity feedback driven by induced buoyancy after a temperature transient in lead-cooled fast reactors
(2017-10-24)
Article
Open AccessConsideration is given to the possibility to use changes in buoyancy as a negative reactivity feedback mechanism during temperature transients in heavy liquid metal fast reactors (HLMFRs). It is shown that by the proper ... -
A new subgrid characteristic length for turbulence simulations on anisotropic grids
(2017-11-29)
Article
Open AccessDirect numerical simulations of the incompressible Navier-Stokes equations are not feasible yet for most practical turbulent flows. Therefore, dynamically less complex mathematical formulations are necessary for coarse-grained ... -
A novel method to determine the discharge coefficient of constant section nozzles under compressible dynamic flow conditions
(2019-07)
Article
Restricted access - publisher's policyThe present paper introduces a novel transient experimental method employed to determine the discharge coefficient of constant section nozzles of small diameters of 1 to 3 mm and with a length/diameter ratio of around one. ... -
A numerical investigation of laminar flow over a backward facing inclined step
(2016-08)
Article
Open AccessThe aim of the present study is to analyze the two dimensional flow over a backward-facing-inclined step in laminar flow regime. The inspiration for the present work is derived from the fact that in automobile industry, ... -
A numerical investigation of wake and mixing layer interactions of flow past a square cylinder
(2016-02-26)
Article
Open AccessThe aim of the present study is to simulate and analyze the interaction of two dimensional flow past a square cylinder in a laminar regime with an upstream mixing layer developed by an axis symmetrical horizontal splitter ... -
A numerical simulation of fluid-structure interaction for flow through valves of a hermetic compressor with immersed boundary method
(2012)
Conference report
Restricted access - publisher's policy -
A Phase-field model study of two-dimensional dendritc growth in thermal solidification processes
(Universitat Politècnica de Catalunya, 2008-06-19)
Master thesis
Open AccessA phasefield model in two dimensions with both surface energy and kinetic anisotropies is used to simulate dendritic solidification of a pure material from its undercooled melt. Two finite differences methods have been ... -
A posteriori error estimates in a finite element VMS-based reduced order model for the incompressible Navier-Stokes equations
(2021-03)
Article
Restricted access - publisher's policyIn this paper we present an a posteriori error estimate for a reduced order model (ROM) for the incompressible Navier-Stokes equations that is based on the fact that the full order model is a finite element (FE) approximation. ... -
A priori study of subgrid-scale features in turbulent Rayleigh-Bénard convection
(2017-10-06)
Article
Open AccessAt the crossroad between flow topology analysis and turbulence modeling, a priori studies are a reliable tool to understand the underlying physics of the subgrid-scale (SGS) motions in turbulent flows. In this paper, ... -
A review of pzt patches applications in submerged systems
(Multidisciplinary Digital Publishing Institute (MDPI), 2018-07-12)
Article
Open AccessSubmerged systems are found in many engineering, biological, and medicinal applications. For such systems, due to the particular environmental conditions and working medium, the research on the mechanical and structural ...
