Exploració per autor "Trias Miquel, Francesc Xavier"
Ara es mostren els items 93-112 de 149
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On a checkerboard-free, conservative method for turbulent flows
(Begell House, 2023)
Text en actes de congrés
Accés restringit per política de l'editorialIn computational fluid dynamics (CFD), the checkerboard problem remains a challenging issue when employing collocated grid arrangements for complex geometries. It manifests as oscillatory and nonphysical pressure modes, ... -
On a conservative solution to checkerboarding: examining the causes of non-physical pressure modes
(European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
Text en actes de congrés
Accés obertIn computational fluid dynamics (CFD), the checkerboard problem remains a challenging issue when employing collocated grid arrangements for complex geometries. It manifests as oscillatory and non-physical pressure modes, ... -
On a conservative solution to checkerboarding: examining the discrete Laplacian kernel using mesh connectivity
(Springer, 2022)
Text en actes de congrés
Accés restringit per política de l'editorialCFD codes that are used for industrial applications commonly use a collocated grid arrangement to calculate the physical flow variables. When using a central differencing gradient (CDG) to discretise the continuous operators ... -
On a high-order energy-preserving unconditionally stable discretization on collocated unstructured grids
(European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
Text en actes de congrés
Accés obertIn this work, an energy-preserving unconditionally stable fractional step method on collocated unstructured grids is presented. Its formulation is based on preserving the underlying symmetries of the differential operators. ... -
On a physically-consistent nonlinear subgrid-scale heat flux model for LES of buoyancy driven flows
(2018)
Text en actes de congrés
Accés restringit per política de l'editorialSmall-scale dynamics is the spirit of turbulence physics. It delivers complex mechanisms when turbulence is purely sustained by buoyancy. This takes place in Rayleigh-Bénard convection (RBC). Most of the existing RBC ... -
On a Proper Tensor-Diffusivity Model for Large-Eddy Simulation of Buoyancy-Driven Turbulence
(Springer, 2020-03-26)
Article
Accés obertIn this work, we aim to shed light to the following research question: can we find a nonlinear tensorial subgrid-scale (SGS) heat flux model with good physical and numerical properties, such that we can obtain satisfactory ... -
On a proper tensor-diffusivity model for large-eddy simulations of buoyancy driven flows
(2019)
Text en actes de congrés
Accés restringit per política de l'editorial -
On a Proper Tensorial Subgrid Heat Flux Model
(2021)
Text en actes de congrés
Accés obertIn this work, we aim to shed light to the following research question: can we find a nonlinear tensorial subgrid-scale (SGS) heat flux model with good physical and numerical properties, such that we can obtain satisfactory ... -
On Preconditioning Variable Poisson Equation with Extreme Contrasts in the Coefficients
(International Centre for Numerical Methods in Engineering (CIMNE), 2021)
Text en actes de congrés
Accés obertIt is well known that the solution by means of iterative methods of very ill-conditioned systems leads to very poor convergence rates. In this context, preconditioning becomes crucial in order to modify the spectrum of the ... -
On self-adaptive Runge-Kutta schemes with improved energy-conservation properties
(European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
Text en actes de congrés
Accés obertIn this paper a novel approach to the computation of the eigenbounds of the system of ordinary differential equations is presented. Afterwards, this approach is applied for different Runge-Kutta methods with various ... -
On the benefits and applications of sparse matrix-matrix product on various parallel architectures
(Parallel Computational Fluid Dynamics (ParCFD), 2022)
Text en actes de congrés
Accés restringit per política de l'editorialSparse matrix-vector multiplications are essential in the numerical resolution of partial differential equations. However, the sparse matrix-vector product is a strongly memory-bound kernel that suffers from data starving. ... -
On the blending of regularization and large-eddy simulation
(International Association for Computational Mechanics (IACM), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialDirect simulations of the incompressible Navier-Stokes equations at high Reynolds numbers are not feasible because the convective term produces far too many relevant scales of motion. Therefore, in the foreseeable future, ... -
On the conservation of primary and secondary properties in the simulation of multiphase flows
(Scipedia, 2022)
Text en actes de congrés
Accés obertThe formulation of multiphase flows emanates from basic conservation laws: mass, momentum and energy. While these are embedded in the celebrated Navier-Stokes equations, none of these properties do necessarily hold when ... -
On the effect of prandtl number to subgrid-scale heat flux models
(Scipedia, 2022)
Text en actes de congrés
Accés obertEstimations of the grid size and computational cost for direct numerical simulation (DNS) and large-eddy simulation (LES) of Rayleigh-Bénard convection (RBC) are presented in the {Ra, P r} phase space. Computational ... -
On the evolution of flow topology in turbulent Rayleigh-Bénard convection
(2016-11-22)
Article
Accés obertSmall-scale dynamics is the spirit of turbulence physics. It implicates many attributes of flow topology evolution, coherent structures, hairpin vorticity dynamics, and mechanism of the kinetic energy cascade. In this work, ... -
On the evolution of Poisson solvers for extreme scale simulations
(Begell House, 2023)
Text en actes de congrés
Accés restringit per política de l'editorialIn this work, we aim to shed light to the following research question: is the complexity of numerically solving Poisson’s equation increasing or decreasing for very large DNS and LES simulations of incompressible flows? ... -
On the feasibility of affordable high-fidelity CFD simulations for indoor environment design and control
(2020-10-15)
Article
Accés obertComputational fluid dynamics (CFD) is a reliable tool for indoor environmental applications. However, accurate CFD simulations require large computational resources, whereas significant cost reduction can lead to unreliable ... -
On the Feasibility of CFD for Transient Air Flow Simulations in Buildings
(2019)
Text en actes de congrés
Accés restringit per política de l'editorialThe rapidly growing computational capacity hasmade CFD simulations an attractive tool for indoorenvironmental applications. The ability of CFD toperform transient simulations could be incorporatedinto model predictive ... -
On the implementation of flux limiters in algebraic frameworks
(2022-02-01)
Article
Accés obertThe use of flux limiters is widespread within the scientific computing community to capture shock dis- continuities and are of paramount importance for the temporal integration of high-speed aerodynamics, multiphase flows ... -
On the Interpolation Problem for the Poisson Equation on Collocated Meshes
(International Centre for Numerical Methods in Engineering (CIMNE), 2021)
Text en actes de congrés
Accés obertThe appearence of unphysical velocities in highly distorted meshes is a common problem in many simulations. In collocated meshes, this problem arises from the interpolation of the pressure gradient from faces to cells. ...
