Showing papers in "Computers & Fluids in 2014"

TL;DR: In this article, the nanofluid boundary layer flow over a rotating disk is the main concern of the present paper and a comparative analysis is made in terms of shear stress and cooling properties of considered nanoparticles.

TL;DR: A brief history of SBP-SAT methods can be found in this paper, where a methodology for deriving SBP operators for first derivatives and second derivatives with variable coefficients is also provided.

TL;DR: In this paper, the effect of Hartmann number, buoyancy ratio number, and Lewis number on convection heat transfer in an enclosure filled with nanofluid is investigated, where the Navier Stokes equations in their vorticity-stream function form are used to simulate the flow pattern, isotherms and concentration.

TL;DR: In this paper, the influence of sheet/cloud cavitation on the hydrodynamic coefficients and surrounding flow turbulent structures was quantified for a 3D Clark-Y hydrofoil fixed at an angle of attack of α = 8 degrees at a moderate Reynolds number.

TL;DR: A brief review of recent progress in FR/CPR research as well as some pacing items and future challenges are presented.

TL;DR: In this article, a numerical framework allowing insight in fluid dynamics inside patient-specific human hearts is presented, where the heart cavities and their wall dynamics are extracted from medical images, with the help of a non-linear image registration algorithm, in order to obtain a patient specific moving numerical domain.

TL;DR: In this article, the authors investigate the bioconvection induced by the hydromagnetic flow of a novel type of a water-based nanofluid containing nanoparticles and motile microorganisms past a permeable vertical moving surface.

TL;DR: In this paper, the authors proposed a new mechanism about turbulence generation and sustenance, that all small length scales (turbulence) are generated by shear layer instability produced by large vortex structure with multiple level vortex rings, multiple level sweeps and ejections, and multiple level negative and positive spikes near the laminar sub-layers.

TL;DR: In this paper, the mixed convective heat transfer of nanofluids through a concentric vertical annulus was considered and a modified two-component four-equation non-homogeneous equilibrium model that fully accounts for the effects of nanoparticles volume fraction distribution was employed.

TL;DR: This paper applies NURBS-based IGA to solve the fourth order stream function formulation of the Navier-Stokes equations, for which a priori error estimates for high order elliptic PDEs under h-refinement are derived.

TL;DR: In this paper, a combination of similarity transformation and finite-difference method was used to analyze the energy conversion problems of conjugate conduction, convection and radiation heat and mass transfer with viscous dissipation and magnetic effects.

TL;DR: In this article, a multiple-relaxation-time (MRT) Rothman and Keller (R-K) lattice Boltzmann model is presented for two phase flows with kinematic viscosity contrast.

TL;DR: In this paper, an improved smoothed particle hydrodynamics (SPH) method for modeling viscous liquid drop is presented by using a hyperbolicshaped kernel function which possesses non-negative second derivatives.

TL;DR: In this paper, the authors investigated the steady MHD laminar flow of an electrically conducting fluid on a radially shrinking rotating disk in the presence of a uniform vertical magnetic field.

TL;DR: In this article, the authors extended the classical Jeffery-Hamel flow due to a point source or sink in convergent/divergent channels to the case where the stationary channel walls are permitted to stretch or shrink.

TL;DR: In this article, a new combination of Large Eddy Simulation (LES), Eulerian-Lagrangian Bubble Tracking Method (BTM), and the Rayleigh-Plesset (RP) equation is proposed to simulate an incipient cavitation, in which only cavitation bubble clouds appear.

TL;DR: In this paper, a high-order cut-cell method is used to numerically simulate two dimensional roughness effects on modal growth in a hypersonic boundary layer and the effect of roughness height is studied in the Mode S simulation.

TL;DR: In this paper, the effect of the initial longitudinal distance and diameter ratio on the occurrence of the drafting, kissing and tumbling (DKT) phenomenon of two non-identical circular particles sedimenting in a two-dimensional infinite channel by using the lattice Boltzmann equation with a multiple-relaxation-time collision model was investigated.

TL;DR: In this article, a simulation of a self-propelled plunging foil was conducted to investigate the effects of passive flexibility on important physical quantities such as the cruising speed, swimming power and propulsive efficiency.

TL;DR: Four distinct approaches to Volume of Fluid (VOF) computational method are compared and two of the methods are the ‘simplified’ VOF formulations, in that they do not require geometrical interface reconstruction.

TL;DR: Simulations of zigzag maneuvers of the Postdam Model Basin (SVA) Korean container ship (KCS) model with moving rudder and rotating propeller are presented and it is found that the rudder has asymmetric behavior caused by the asymmetry introduced by the single rotating propellers.

TL;DR: In this article, the authors focused on the assessment of different LES models (e.g. VMS or SIGMA models), as well as to show their capabilities of capturing the large scale turbulent flow structures in car-like bodies using relative coarse grids.

TL;DR: In this article, a numerical model for micro-mixing in micro-channel T-junction with wavy structure was developed for single phase mixing of laminar Newtonian miscible fluid and it solved for conservation of mass, momentum and species.

TL;DR: An assessment of the (quasi-)DNS capabilities of the OpenFOAM finite volume CFD solver for both structured hexahedral meshes and arbitrary polyhedral meshes finds that the differences between the Open FOAM solutions and the considered reference DNS solutions are practically the same as the mutual differences between these reference DNS Solutions when structured hex ahedral meshes are used.

TL;DR: In this article, the effects of designing parameters such as aspect ratio of cross section and ratio of amplitude to wave length (A / ʎ ) and operational condition such as Reynolds number on pressure drop and mixing index are also investigated.

TL;DR: The results indicate that the RK projection methods provide low-dissipative alternatives to the PISO method, and the turbulent test cases show also that theRK-methods have a good computational efficiency.

TL;DR: A wide range of discretization schemes commonly used for diffusive flux approximation in cell-centered unstructured finite volume solvers are compared and it is suggested that adding a solution jump term to the baseline face gradient provides the most accurate approximation for diffusion fluxes.

TL;DR: In this paper, a thermal lattice Boltzmann flux solver (TLBFS) is developed for simulation of incompressible thermal flows, which is only applied to reconstruct the local solution of TLBM for evaluation of fluxes at the cell interface.

TL;DR: In this article, a combined lattice Boltzmann method (LBM) and immersed boundary method (IBM) with discrete element method (DEM) was used to model the sedimentation of 2D circular particles in incompressible Newtonian flows.

TL;DR: The tests show that the level of accuracy provided by high-order DG discretizations is comparable to that of spectral methods for an equivalent number of degrees of freedom.