Zobrazeno 1 - 10
of 235
pro vyhledávání: '"Dubois, Francois"'
Publikováno v:
10th international conference on Finite Volumes for Complex Applications, Oct 2023, Strasbourg, France. pp.83-92
We propose a variational symplectic numerical method for the time integration of dynamical systems issued from the least action principle. We assume a quadratic internal interpolation of the state between two time steps and we approximate the action
Externí odkaz:
http://arxiv.org/abs/2406.19000
Publikováno v:
Geometric Science of Information, Saint-Malo (France), Aug 2023, Saint-Malo, France. pp.22-31
We propose a variational symplectic numerical method for the time integration of dynamical systems issued from the least action principle. We assume a quadratic internal interpolation of the state and we approximate the action in a small time step by
Externí odkaz:
http://arxiv.org/abs/2406.16423
In this contribution, we address the numerical solutions of high-order asymptotic equivalent partial differential equations with the results of a lattice Boltzmann scheme for an inhomogeneous advection problem in one spatial dimension. We first deriv
Externí odkaz:
http://arxiv.org/abs/2403.19231
Autor:
Dubois, François
Publikováno v:
La Recherche Aerospatiale (English edition), 1990, 1990-3, pp.77-80
It is shown that for any real gas in chemical equilibrium, the convexity proposed by Lax isequivalent to the concavity of the entropy considered as thermodynamic potential and thepositivity of temperature.
Externí odkaz:
http://arxiv.org/abs/2312.08745
Autor:
Dubois, François
Publikováno v:
48th International Astronautical Congress, International Astronautical Federation, Oct 1997, Turin (IT), Italy
We present a review of the literature on the subject of a possible collision between the Earthand a meteorite or comet. We emphasize the global effects when sufficient energy is involved.We propose several types of human actions adapted to the physic
Externí odkaz:
http://arxiv.org/abs/2311.11711
Autor:
Dubois, François
Publikováno v:
Matapli, 2023, 131, pp.51-89
We present an algebraic construction of music notes and show how to associate them inseveral ways to construct music ranges. Then a family of ranges emerge with a fixed number of notes: two, three, five, seven, twelve, seventeen, etc. A classificatio
Externí odkaz:
http://arxiv.org/abs/2310.04092
Autor:
Dubois, François, Lallemand, Pierre
Publikováno v:
Progress in Computational Fluid Dynamics, 2008, 8 (1-4), pp.11-24
We develop the idea that a natural link between Boltzmann schemes and finite volumes exists naturally: the conserved mass and momentum during the collision phase of the Boltzmann scheme induces general expressions for mass and momentum fluxes. We tre
Externí odkaz:
http://arxiv.org/abs/2306.15291
Publikováno v:
Sixteenth International Conference Zaragoza-Pau on Mathematics and its Applications, Universit{\'e}s de Pau et de Zaragoza, Sep 2022, Jaca, Spain
In this work, we consider a mechanical system whose mass tensor implements a scalar product in a Riemannian manifold. This system is controlled with the help of forces and torques. A cost functional is minimized to achieve an optimal trajectory. In t
Externí odkaz:
http://arxiv.org/abs/2304.10959
In order to derive the equivalent partial differential equations of a lattice Boltzmann scheme,the Chapman Enskog expansion is very popular in the lattive Boltzmann community. A maindrawback of this approach is the fact that multiscale expansions are
Externí odkaz:
http://arxiv.org/abs/2302.07535
Autor:
Dubois, François, Lallemand, Pierre
Publikováno v:
Communications in Computational Physics, 2023, 34, pp.613-671
In this contribution we study the formal ability of a multi-resolution-times lattice Boltzmann scheme to approximate isothermal and thermal compressible Navier Stokes equations with a single particle distribution. More precisely, we consider a total
Externí odkaz:
http://arxiv.org/abs/2206.13261