Exploració per tema "Direct numerical simulation"
Ara es mostren els items 1-20 de 29
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A low-dissipation finite element scheme for scale resolving simulations of turbulent flows
(2019-08-01)
Article
Accés obertThe 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 ... -
A study of the flow-field evolution and mixing in a planar turbulent jet using direct numerical simulation
(2002-01-10)
Article
Accés obertTurbulent plane jets are prototypical free shear flows of practical interest in propulsion, combustion and environmental flows. While considerable experimental research has been performed on planar jets, very few ... -
Bifurcation phenomena in Taylor–Couette flow in a very short annulus with radial through-flow
(Nature, 2022-12-21)
Article
Accés obertIn this study, the non-linear dynamics of Taylor–Couette flow in a very small-aspect-ratio wide-gap annulus in a counter-rotating regime under the influence of radial through-flow are investigated by solving its full ... -
Characteristic spanwise length scales of streamwise vortical structures in the wake of a circular cylinder at Re = 1500 measured via global and local approaches
(Elsevier, 2023-01-30)
Article
Accés restringit per política de l'editorialWake characteristics of the flow past a circular cylinder are analysed in detail at Reynolds number Re = 1500 via direct numerical simulation. A periodic spanwise domain of length 1.5pD has been found to yield correct ... -
Direct and large eddy simulations of non-Oberbeck-Boussinesq effects in a turbulent tall water-filled differentially heated cavity
(2015)
Text en actes de congrés
Accés restringit per política de l'editorialThe present work first submits to investigation the non-Oberbeck-Boussinesq (NOB) effects in a tall water-filled differentially heated cavity by means of direct numerical simulations. The results reveal that if NOB effects ... -
Direct numerical simulation of a fully developed turbulent square duct flow up to Re-tau=1200
(2015-08-01)
Article
Accés obertVarious fundamental studies based on a turbulent duct flow have gained popularity including heat transfer, magnetohydrodynamics as well as particle-laden transportation. An accurate prediction on the turbulent flow field ... -
DNS of turbulent natural convection flows on the MareNostrum supercomputer
(2009)
Article
Accés restringit per política de l'editorialA code for the direct numerical simulation (DNS) of incompressible turbulent flows that provides a fairly good scalability for a wide range of computer architectures has been developed. The spatial discretization of the ... -
Estimating turbulence kinetic energy dissipation rate in numerically simulated stratocumulus cloud-top mixing layers
(2019-05-01)
Article
Accés obertIn this work, direct numerical simulation (DNS) of the stratocumulus cloud-top mixing layer is used to test various approaches to estimate the turbulence kinetic energy (TKE) dissipation rate « from one-dimensional (1D) ... -
Hybrid MPI+OpenMP parallelization of a Navier-Stokes solver for large-scale DNS
(2011)
Comunicació de congrés
Accés restringit per política de l'editorialThis work presents a parallel Navier-Stokes solver for the large-scale direct numerical simulation (DNS) of incompressible flows with one periodic direction. It is based on a scalable Poisson solver that combines an FFT ... -
Hybrid MPI+OpenMP parallelization of an FFT-based 3D Poisson solver with one periodic direction
(2011-10)
Article
Accés restringit per política de l'editorialThis work is devoted to the development of efficient parallel algorithms for the direct numerical simulation (DNS) of incompressible flows on modern supercomputers. In doing so, a Poisson equation needs to be solved at ... -
Impact of thermally driven ocean turbulence on the melting of ice
(2016-03-23)
Article
Accés obertDirect numerical simulation and laboratory experiments are used to investigate turbulent convection beneath a horizontal ice–water interface. Scaling laws are derived that quantify the dependence of the melt rate of the ... -
Increasing flow complexity in time-dependent modulated ferrofluidic Couette flow
(2022-06-08)
Article
Accés obertWe present numerical simulations of ferrofluidic Couette flow in between counter-rotating cylinders with a spatially homogeneous magnetic field but subject to time-periodic modulation. Such a modulation can lead to a ... -
Large-scale coherent structures in an asymmetrically heated channel flow
(European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
Text en actes de congrés
Accés obertA compressible direct numerical simulation (DNS) has been conducted to analyze the behavior of low-speed flows submitted to a strong temperature gradient in a fully developed and asymmetrically heated turbulent channel ... -
Moisture statistics in free convective boundary layers growing into linearly stratified atmospheres
(2017-07-27)
Article
Accés obertWe use dimensional analysis and direct numerical simulations to characterize specific humidity statistics in the equilibrium (quasi-steady) entrainment regime of cloud-free convective boundary layers that grow into ... -
Near-surface effects of free atmosphere stratification in free convection
(2016-04-01)
Article
Accés obertThe effect of a linear stratification in the free atmosphere on near-surface properties in a free convective boundary layer (CBL) is investigated by means of direct numerical simulation. We consider two regimes: a neutral ... -
Near-Wall Flow in Turbomachinery Cascades—Results of a German Collaborative Project
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-05-08)
Article
Accés obertThis article provides a summarizing account of the results obtained in the current collabora-tive work of four research institutes concerning near-wall flow in turbomachinery. Specific questions regarding the influences ... -
New subgrid-scale models for large-eddy simulation of Rayleigh-Bénard convection
(Institute of Physics (IOP), 2016)
Text en actes de congrés
Accés obertAt the crossroad between flow topology analysis and the theory of turbulence, a new eddy-viscosity model for Large-eddy simulation has been recently proposed by Trias et al.[PoF, 27, 065103 (2015)]. The S3PQR-model has the ... -
Numerical study of rising bubbles with path instability using conservative level-set and adaptive mesh refinement
(Elsevier, 2019-06-15)
Article
Accés obertThis paper focuses on three-dimensional direct numerical simulations of rising bubbles in the wobbling regime, and the study of its dynamical behavior for Eötvös number 1 ≤ Eo ≤ 10 and Morton number 1e−11 ≤ M ≤ 1e−9. ... -
Parallel Poisson solver for revolved unstructured grids. DNS of the flow around a sphere at Re = 3700.
(2009)
Comunicació de congrés
Accés restringit per política de l'editorialIn this paper a parallel direct Poisson solver for DNS simulation of turbulent flows in domains of revolution using unstructured meshes is presented. It is based on a Fourier diagonalization in the azimuthal direction and ... -
Parallelization of a DEM/CFD code for the numerical simulation of particle-laden turbulent flows
(2011)
Comunicació de congrés
Accés obertThe interaction between a turbulent fluid flow and particle motion is investigated numerically. A complete direct numerical simulation (DNS) is carried out to solve the governing equations of the fluid phase, to investigate ...