Richard Fournier

Laboratoire Plasma et Conversion d'Energie

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Stéphane Blanco

Laboratoire Plasma et Conversion d'Energie

Mouna El-Hafi

IMT Mines Albi

F. Hourdin

Laboratoire de Météorologie Dynamique

Jacques Gautrais

Centre de Recherches sur la Cognition Animale

Jean‐Louis Dufresne

Laboratoire de Météorologie Dynamique

Vincent Eymet

Centre National de la Recherche Scientifique

F. Forget

Sorbonne Université

Cyril Caliot

Centre National de la Recherche Scientifique

Jérémi Dauchet

Clermont Auvergne INP

Vincent Forest

Laboratoire Plasma et Conversion d'Energie

Cooperative Institutions

Centre National de la Recherche Scientifique

Université de Toulouse

Université Toulouse III - Paul Sabatier

Laboratoire Plasma et Conversion d'Energie

Institut National Polytechnique de Toulouse

ÉN

École Nationale Supérieure d'Électrotechnique, d'Électronique, d'Informatique, d'Hydraulique et des Télécommunications

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Sorbonne Université

IMT Mines Albi

Centre de Recherche d'Albi en génie des Procédés, des SOlides Divisés, de l'Énergie et de l'Environnement

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Net exchange parameterization of thermal infrared radiative transfer in Venus' atmosphere

Journal of Geophysical Research Atmospheres (2009)

V. Eymet Richard Fournier Jean‐Louis Dufresne S. Lebonnois F. Hourdin

Thermal radiation within Venus atmosphere is analyzed in close details. Prominent features are identified, which are then used to design a parameterization (a highly simplified and yet accurate enough model) to be used in General Circulation Models. The analysis is based on a net exchange formulation, using a set of gaseous and cloud optical data chosen among available referenced data. The accuracy of the proposed parameterization methodology is controlled against Monte Carlo simulations, assuming that the optical data are exact. Then, the accuracy level corresponding to our present optical data choice is discussed by comparison with available observations, concentrating on the most unknown aspects of Venus thermal radiation, namely the deep atmosphere opacity and the cloud composition and structure.

Opacity

Atmosphere of Venus

Thermal Radiation

Earth's energy budget

10.1029/2008je003276

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Citations (54)

Méthode de Monte-Carlo par échanges pour le calcul des bilans radiatifs au sein d'une cavité 2D remplie de gaz

Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy (1998)

Jean‐Louis Dufresne Richard Fournier Jean‐Yves Grandpeix

10.1016/s1251-8069(97)86950-3

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Citations (6)

Short-Path Statistics and the Diffusion Approximation

Physical Review Letters (2006)

Stéphane Blanco Richard Fournier

In the field of first return time statistics in bounded domains, short paths may be defined as those paths for which the diffusion approximation is inappropriate. This is at the origin of numerous open questions concerning the characterization of residence time distributions. We show here how general integral constraints can be derived that make it possible to address short-path statistics indirectly by application of the diffusion approximation to long paths. Application to the moments of the distribution at the low-Knudsen limit leads to simple practical results and novel physical pictures.

Heavy traffic approximation

10.1103/physrevlett.97.230604

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Citations (38)

Transfer function estimation with SMC method for combined heat transfer: insensitivity to detail refinement of complex geometries

Léa Penazzi S. Blanco Cyril Caliot C. Coustet Mouna El-Hafi

The optimization of thermal transfers in engineering systems such as heat exchangers requires the analysis of the influence of heat sources upon the temperature at various positions of interest in the studied system. In order to achieve the resolution of the combined modes of heat transfer through these systems, their couplings and the complex 3D geometries involved need to be integrated with full accuracy. Recent developments in probabilistic formulations in the context of transient combined heat transfer (linearized conduction-radiation-convection) have opened a new route to solving such problems with Monte Carlo (MC) algorithms, using state-of-the-art computer graphics digital libraries to handle complex geometries. To estimate the temperature at a probe point of interest, random paths are generated from its position and propagated through the geometry until a known temperature is reached. From a single MC calculation to sample the path statistics, the Symbolic Monte Carlo (SMC) method is used to express the probe temperature as a linear function of the sources. This function can then be used to estimate the probe temperature for any source values, alleviating the need to repeat Monte-Carlo simulations for each source condition, resulting in greatly reduced computation time. This approach is applied to the case of an open-cavity porous medium and computation time insensitivity to the complexity and fineness of the geometry is demonstrated.

10.1615/ichmt.2021.cht-21.300

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Citations (2)

Complementary Finite Element and Monte-Carlo Methods to Solve Industrial Thermal Problems

EPJ Web of Conferences (2024)

C. Péniguel Isabelle Rupp Richard Fournier Stéphane Blanco Vincent Eymet

This paper presents the integration of a Monte-Carlo solver inside SYRTHES, an open-source thermal code, originally based on finite elements method. Insensitive to both the geometric complexity of the model and the fineness of its discretization, this stochastic method is a good complementary option to simulate large configurations with specific locations of interest. Radiation, conduction and convection can be combined to solve thermal problems in complex geometries. The Monte-Carlo method is described before showing its integration in the code SYRTHES. Comparisons against results obtained thanks to finite elements and Monte-Carlo approaches or analytical solutions are presented. Finally, industrial cases illustrate the advantages of using these two complementary approaches.

Solver

Monte Carlo integration

10.1051/epjconf/202430206003

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Citations (0)

Simulations of the Dynamics of Venus' Atmosphere with the LMD Venus General Circulation Model

DPS (2006)

Audrey Crespin S. Lebonnois F. Hourdin V. Eymet Richard Fournier

Atmosphere of Venus

Source

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Numerical modelling of the circulation of superrotating atmospheres: Venus and Titan

ESASP (1996)

F. Hourding Olivier Talagrand Kristen Menou Richard Fournier J.-L. Dufresnes

Atmospheric superrotation is known to exist on Venus where the cloud cover, at 70 km above the surface, rotates about 60 times faster than the solid planet. Superrotation is strongly suspected on Titan on the basis of numerical studies and observations. The numerical simulation of superrotation is described. It is shown how the general circulation models, originally developed for terrestrial meteorology and climatology, can be used to infer the circulation in such atmospheres. The emphasis is on the case of Titan for which a specific general circulation model was developed.

Atmospheric Circulation

Atmosphere of Venus

Numerical models

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Citations (2)

Monte Carlo implementation of Schiff׳s approximation for estimating radiative properties of homogeneous, simple-shaped and optically soft particles: Application to photosynthetic micro-organisms

Journal of Quantitative Spectroscopy and Radiative Transfer (2015)

J. Charon Stéphane Blanco Jean‐François Cornet Jérémi Dauchet Mouna El-Hafi

Monte Carlo integration

10.1016/j.jqsrt.2015.10.020

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Citations (12)

Stardis: Propagator evaluation for coupled heat transfer in large geometric models

HAL (Le Centre pour la Communication Scientifique Directe) (2022)

Léa Penazzi Stéphane Blanco Cyril Caliot C. Coustet Mouna El-Hafi

Propagator

Source

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Implementation of the force term in half-range lattice Boltzmann models

arXiv (Cornell University) (2017)

Victor E. Ambruş Victor Sofonea Richard Fournier Stéphane Blanco

In the frame of the Boltzmann equation, wall-bounded flows of rarefied gases require the implementation of boundary conditions at the kinetic level. Such boundary conditions induce a discontinuity in the distribution function with respect to the component of the momentum which is normal to the boundary. Expanding the distribution function with respect to half-range polynomials allows this discontinuity to be captured. The implementation of this concept has been reported in the literature only for force-free flows. In the case of general forces which can have non-zero components in the direction perpendicular to the walls, the implementation of the force term requires taking the momentum space gradient of a discontinuous function. Our proposed method deals with this difficulty by employing the theory of distributions. We validate our procedure by considering the simple one-dimensional flow between diffuse-reflective walls of equal or different temperatures driven by the constant gravitational force. For this flow, a comparison between the results obtained with the full-range and the half-range Gauss-Hermite LB models is also presented.

Lattice Boltzmann methods

Discontinuity (linguistics)

Momentum (technical analysis)

10.48550/arxiv.1708.03249

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Citations (3)