Renaud Motte

Renaud Motte
Atomic Energy and Alternative Energies Commission | CEA · DAM Île-de-France (DIF)

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18
Publications
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91
Citations

Publications

Publications (18)
Article
Full-text available
Compressible multi-materialflows are encountered in a wide range of natural phenomena and industrial applications, such as supernova explosions in space, high speed flows in jet and rocket propulsion, underwater explosions, and vapor explosions in post accidental situations in nuclear reactors. In the numerical simulations of these flows, interface...
Article
This paper is dedicated to the design of an artifact-free and geometrically accurate low-diffusive interface capturing method for pure advection problems with extension to the multifluid/multimaterial case. The numerical method involves a genuinely multi-dimensional gradient limiting process that provides interface reconstruction accuracy without a...
Poster
Full-text available
Keywords : Diffuse interface approach, multidimensional limiting process, compressive limiters, compressible flows, multimaterial flows, transport equation, advection, conservative scheme, finite volume method, maximum principle
Article
We study an Eulerian scheme of Lagrange-Remap type, which simulates compressible multi-material fluid flows. The Lagrangian phase is based on a collocated scheme called EUCCLHYD (Explicit Unstructured Cell-Centered Lagrangian HYDrodynamics, Maire et al., 2007), whereas the remap phase uses alternate directions with interface reconstruction of PLIC...
Article
In this article we show the gain in accuracy and robustness brought by the use of a a posteriori MOOD limiting in replacement of the classical slope limiter employed in the remap phase of a legacy second-order Lagrange+Remap scheme solving the Euler system of equations. This simple substitution ensures extended robustness property, better accuracy...
Presentation
Full-text available
Outline : 1. Lagrange-remap: different remapping variant approaches 2. Lagrange-flux schemes 3.,The entropy property (1D analysis) 4. Stable and low-diffusive advection schemes for interface capturing
Article
A new 2D interface reconstruction method which ensures continuity of the interface and preserves volume fractions is presented here. It is made of two steps, first the minimization of a cost functional based on volume fractions least square errors by using dynamic programming, a fast and efficient scheme well known in image processing, and then a l...
Article
Full-text available
In a previous paper, we have achieved the performance analysis of staggered Lagrange-remap schemes, a class of solvers widely used for Hydrodynamics applications. This paper is devoted to the rethinking and redesign of the Lagrange-remap process for achieving better performance using today's computing architectures. As an unintended outcome, the an...
Conference Paper
This paper is a practical example of co-design between numerical analysis and high performance computing, applied to compressible fluid mechanics. We consider a legacy numerical method, based on a Lagrange-Remap solver for the compressible Euler equations, use tools from analytical performance modeling to quantitatively understand its behavior on r...
Conference Paper
This paper is devoted to the redesign of the Lagrangian remapping process for compressible Hydrodynamics in order to achieve better computational performance. As an unintended outcome, the analysis has lead us to the discovery of a new family of solvers -- the so-called Lagrange-flux schemes -- that appear to be very promising for the CFD community...
Article
Full-text available
In this paper, stable and "low-diffusive" multidimensional interface capturing (IC) schemes using slope limiters are discussed. It is known that direction-by-direction slope-limited MUSCL schemes create geometrical artifacts and thus return a poor accuracy. We here focus on this particular issue and show that the reconstruction of gradient directio...
Presentation
Full-text available
SIAM Conference on Parallel Processing for Scientific Computing, Universite Pierre et Marie Curie, Cordeliers Campus
Conference Paper
This work is devoted to the performance modeling of a vectorized multi-threaded implementation of a compressible hydrodynamics solver on current multicore CPUs. The underlying explicit time-advance scheme is based on a Lagrange+remap discretization. The algorithm consists in nine elementary kernels that exhibit, for most of them, a stencil update p...
Conference Paper
Full-text available
The aim of this work is double: i) first achieve HPC-node performance analysis of a staggered Lagrange+remap CFD solver for solving multimaterial compressible hydrodynamics problems; ii) second, design a better-performance alternative scheme suitable for current and future computing architectures. In particular, we tune two quantitative performance...
Article
In this work, we propose an adaptive subdivision piecewise linear interface calculation (PLIC) for 2D multimaterial hydrodynamic simulation codes. Classical volume-of-fluid PLIC technique uses one line segment and one given normal to separate two materials. Unfortunately, these paradigms are not sufficient when filaments occur, leading to the creat...
Article
Full-text available
In this work, we are interested in a complex fluid-kinetic model that aims to take into account the compressibility of the droplets of the spray. The ambient fluid is described by Euler-like equations, in which the transfer of momentum and energy form the droplets is taken into account, while the spray is represented by a probability density functi...

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Projects

Projects (4)
Project
The goal of the project is to achieve a good numerical resolution of the interfaces in compressible multi-material flows, using the higher resolution numerical schemes.
Archived project
Finite Volumes
Project
Performance models (roofline, execution cache memory ECM) that return a quantitative upper bound of HPC performance on node-base architectures (multicore processors) for complex stencil-based PDE solvers. Current focus is on Lagrnage-remap and Lagrange-flux scheme for solving Hydrodynamics problems.