Exploració per tema "Turbulent flows"
Ara es mostren els items 1-15 de 15
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A conservative overlap method for multi-block parallelization of compact finite-volume schemes
(Elsevier, 2017-12)
Article
Accés obertA conservative approach for MPI-based parallelization of tridiagonal compact schemes is developed in the context of multi-block finite-volume methods. For each block, an enlarged linear system is solved by overlapping a ... -
A heuristic argument for the sole use of numerical stabilization with no physical LES modeling in the simulation of incompressible turbulent flows
(2009-07-14)
Article
Accés obertWe aim at giving support to the idea that no physical Large Eddy Simulation (LES) model should be used in the simulation of turbulent flows. It is heuristically shown that the rate of transfer of subgrid kinetic energy ... -
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 new subgrid characteristic length for turbulence simulations on anisotropic grids
(2017-11-29)
Article
Accés obertDirect 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 ... -
An experimental investigation of the effect of fractal grids on the near and full field structure of a turbulent round jet
(Universitat Politècnica de Catalunya, 2016-04-07)
Treball Final de Grau
Accés restringit per decisió de l'autorThis project involves the experimental analysis of a jet with different nozzle configurations. The first configuration being a classic round nozzle and the second is modified adding a "fractal grid" by modifying the flow ... -
Direct and large-eddy simulations of turbulent flows using a symmetry-preserving discretization
(Universitat Politècnica de Catalunya, 2023-07-11)
Projecte Final de Màster Oficial
Accés obertThis work concerns the numerical resolution of the incompressible Navier-Stokes equations using the Fractional Step method. A C++ finite volume self-made code was used to study a variety of benchmark cases. The Fractional ... -
Energy preserving turbulent simulations at a reduced computational cost
(2015-10)
Article
Accés obertEnergy-conserving discretizations are widely regarded as a fundamental requirement for high-fidelity simulations of turbulent flows. The skew-symmetric splitting of the nonlinear term is a well-known approach to obtain ... -
Experimental analysis for peristalsis drag reduction technique
(Universitat Politècnica de Catalunya, 2016-02-25)
Treball Final de Grau
Accés obert
Realitzat a/amb: Politecnico di MilanoMost of the flows on our day basis are turbulent (airplane, cars, heat exchangers) so know its behavior has raised the interest of the industry. Compared to laminar flows turbulent ones have a higher skin-friction drag due ... -
Gradient trajectory analysis of a scalar field with external intermittency
(2009-05-10)
Article
Accés obertThe passive scalar field of a temporally evolving shear layer is investigated using gradient trajectories as a means to analyse the scalar probability density function and the conditional scalar dissipation rate in the ... -
Large eddy simulation and laboratory experiments on the decay of grid wakes in strongly stratified flows
(2009-07-27)
Article
Accés obertA detailed analysis of the flow structure resulting from the combination of turbulence and internal waves is carried out and visualized by means of the Schlieren method on waves in a strongly stratified fluid at the ... -
MicroHH 1.0: a computational fluid dynamics code for direct numerical simulation and large-eddy simulation of atmospheric boundary layer flows
(2017-08-28)
Article
Accés obertThis paper describes MicroHH 1.0, a new and open-source (www.microhh.org) computational fluid dynamics code for the simulation of turbulent flows in the atmosphere. It is primarily made for direct numerical simulation but ... -
On the dynamics of the turbulent flow past a three-element wing
(2024-02-12)
Article
Accés obertA comprehensive analysis of the unsteady flow dynamics past the 30P30N three-element high lift wing is performed by means of large eddy simulations at different angles of attack (AoA=5°, 9°, and 23°) and at a Reynolds ... -
Regularization modeling of wall-bounded turbulent flows
(2010)
Comunicació de congrés
Accés restringit per política de l'editorialSince direct numerical simulations cannot be computed at high Reynolds numbers, a dynamically less complex formulation is sought. In the quest for such a formulation, we consider regularizations of the convective term ... -
Towards stochastic methods in CFD for engineering applications
(Universitat Politècnica de Catalunya, 2021-12-21)
Tesi
Accés obertRecent developments of high performance computing capabilities allow solving modern science problems employing sophisticated computational techniques. However, it is necessary to ensure the efficiency of state of the art ... -
Turbulent flow in a differentially heated cavity: direct numérical simulation and regularization modeling
(2010)
Comunicació de congrés
Accés restringit per política de l'editorialWe consider regularizations of the convective term that preserve symmetry and conservation properties exactly. This yields a novel class of regularizations that restrain the convective production of small scales in an ...