Di Pierro Bastien- PhD
- Assistant professor at Claude Bernard University Lyon 1
Di Pierro Bastien
- PhD
- Assistant professor at Claude Bernard University Lyon 1
About
25
Publications
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210
Citations
Introduction
Variable density incompressible flow
Complex flows
High Performance computing
Current institution
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Publications
Publications (25)
This study aims to enhance the efficiency of flat plate solar collectors by integrating offset strip fins and utilizing Ansys Fluent for numerical analysis, validating results from a SolidWorks-designed solar air dryer. It outlines system components and objectives based on a standard model, supporting both theoretical and experimental analyses for...
Though the influence of surfactant type on foam rheological properties is well established experimentally, the underlying physical mechanisms are far from understood. Here, using fully resolved numerical simulation of an elementary T1 event taking into account both flow and surfactant dynamics, we unveil the origin of surfactant-induced dissipation...
In the present study, the effects of density variations on structures developing in an
isotropic incompressible turbulent flow are investigated. Statistical analyses are carried
out on data sets obtained from direct numerical simulations of forced turbulence. The
discretized variable-density incompressible Navier-Stokes equations are time advanced...
In the present study, the efficiency of preconditioners for solving linear systems associated with the discretized variable-density incompressible Navier-Stokes equations with semi-implicit second-order accuracy in time and spectral accuracy in space is investigated. The method, in which the inverse operator for the constant-density flow system act...
Linear stability of solid body rotating flows with axisymmetric density variations is addressed analytically. Considering inviscid disturbances, a non trivial dispersion relation is obtained and it is shown that the instability is of Rayleigh-Taylor type in cylindrical frame. The viscous correction is derived, in the limit of large Reynolds numbers...
Linear stability of solid body rotating flows with axisymmetric density variations is addressed analytically. Considering inviscid disturbances, a nontrivial dispersion relation is obtained and it is shown that the instability is of Rayleigh-Taylor type in cylindrical frame. The viscous correction is derived, in the limit of large Reynolds numbers...
To identify laminar/turbulent transition paths in plane Couette flow, a variational formulation incorporating a restricted nonlinear (RNL) system that retains a single streamwise Fourier mode, is used. Considering the flow geometry originally used by Monokrousos et al. (2011) and Duguet et al. (2013) and the same Reynolds numbers Re, we show that i...
The increase of computational resources with the generalization of massively parallel supercomputers benefits to various fields of physics among which turbulence and fluid mechanics, making it possible to increase time and space accuracy and gain further knowledge in fundamental mechanisms. Parametric studies, high fidelity statistics, high resolut...
Massively parallel simulations generate increasing volumes of large data, whose exploitation requires large storage resources, efficient network and increasingly large post-processing facilities. In the coming era of exascale computations, there is an emerging need for new data analysis and visualization strategies. In order to meet these challenge...
The physics of atomization process involves many spatial scales, generating a wide variety of liquid inclusions of different sizes with large density and viscosity ratios between liquid and gas phases. To correctly capture the dynamics of these phenomena, each scale should be resolved with an appropriate method to ensure the conservation of physica...
The laminar–turbulent transition of a plane channel entrance flow is revisited using global linear optimization analyses and direct numerical simulations. The investigated case corresponds to uniform upstream velocity conditions and a moderate value of Reynolds number so that the two-dimensional developing flow is linearly stable under the parallel...
The classical Stokes' problem describing the fluid motion due to a steadily moving infinite wall is revisited in the context of dense granular flows of mono-dispersed beads using the recently proposed $\mu(I)$--rheology. In Newtonian fluids, molecular diffusion brings about a self-similar velocity profile and the boundary layer in which the fluid m...
The classical Stokes' problem describing the fluid motion due to a steadily moving infinite wall is revisited in the context of dense granular flows of mono-dispersed beads using the recently proposed $\mu(I)$--rheology. In Newtonian fluids, molecular diffusion brings about a self-similar velocity profile and the boundary layer in which the fluid m...
The physics of atomization process involve many spatial scales, generating a wide variety of liquid inclusions of different sizes with large density and viscosity ratios between liquid and gas phases. To correctly capture the dynamics of these phenomena, each scale should be resolved with an appropriate method to ensure the conservation of physical...
We present a new adaptive multiresoltion method for the numerical simulation of ideal
magnetohydrodynamics. The governing equations, i.e., the compressible
Euler equations coupled with the Maxwell equations are discretized using a finite volume
scheme on a two-dimensional Cartesian mesh. Adaptivity in space is obtained via Harten’s
cell average mul...
Linear stability of a variable density, and incompressible, swirling jet is studied at moderate Reynolds numbers, both experimentally and numerically. Mean flow characteristics are obtained experimentally. They show a correlation between axial velocity and density profiles. For low density ratios, s, the presence of self-sustained oscillations of t...
This paper is devoted to the development of a parallel, spectral and second‐order time‐accurate method for solving the incompressible and variable density Navier–Stokes equations. The method is well suited for finite thickness density layers and is very efficient, especially for three‐dimensional computations. It is based on an exact projection tec...
Linear and nonlinear impulse responses are computed, using three-dimensional numerical simulations, for an incompressible and variable density (inhomogeneous) Batchelor vortex at a moderately high Reynolds number, . In the linear framework, the computed wavepacket is decomposed into azimuthal modes whose growth rates are determined along each spati...
Using linear instability theory and nonlinear dynamics, the Rayleigh-Taylor instability
of variable density swirling flows is studied. It is found that the flow topology could be
predicted, when the instability sets in, using a function χ dependent on
density and axial and azimuthal velocities. It is shown that even when the inner
axial-flow is hea...
Using spectrally accurate, direct numerical simulations, we show that vortices with axial flows (without an imposed strain) generate small scales, i.e., breakdown, when they are randomly perturbed. We show that the breakdown that occurs without the necessity of a stagnation point in the flow is nonlinear and that energy spectra of the breakdown pre...
Inviscid swirling flows are modeled, for analytical studies, using axisymmetric azimuthal, V(r), and axial, W(r), velocity profiles (r is the distance from the axis). The asymptotic analysis procedure (large wave numbers, k axial and m azimuthal) developed by Leibovich and Stewartson [J. Fluid Mech. 126, 335 (1983)], and used by many authors, break...
