Claude Basdevant - Academia.edu (original) (raw)
Papers by Claude Basdevant
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy, 2000
ABSTRACT
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Comptes Rendus de l Académie des Sciences - Series I - Mathematics
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IUTAM Bookseries, 2009
A high-resolved Large Eddy Simulation (LES) of the flow around an airfoil near stall has been ach... more A high-resolved Large Eddy Simulation (LES) of the flow around an airfoil near stall has been achieved. We have observed that the laminar boundary layer undergoes a quick transition to turbulence in a Laminar Separation Bubble (LSB) close to the leading edge of the airfoil profile. The flow structures in this transitional flow region have been analysed and the transition
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Lecture Notes in Physics, 1990
Without Abstract
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Journal of The Atmospheric Sciences, 1981
The régime flows corresponding to the barotropic nondivergent equation with forcing, drag and sub... more The régime flows corresponding to the barotropic nondivergent equation with forcing, drag and subgrid-scale dissipation are studied using spectral model on the plane and on the sphere. The flow régimes obtained exhibit clear evidence of the existence of an enstrophy-cascading inertial range, together with a reverse energy cascade toward small wavenumbers. It is shown, however, that the enstrophy cascade is
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Physics and Chemistry of the Earth, 1995
The STRATÉOLE experiment is designed to study the wintertime Antarctic lower stratosphere polar v... more The STRATÉOLE experiment is designed to study the wintertime Antarctic lower stratosphere polar vortex and its springtime breakdown. To this end, it is planned to fly a large number (around 200) of long-lived (3 months), small isopycnic drifting balloons instrumented with temperature and pressure sensors, GPS and transmitters. The main goal of STRATÉOLE experiment is to provide an unprecedented documentation
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In September and October 2005 27 superpressure balloons SPB were launched from McMurdo 167 E 78 S... more In September and October 2005 27 superpressure balloons SPB were launched from McMurdo 167 E 78 S a station in Antarctica SPBs are able to drift for months in the lower stratosphere at a constant density level The mean flight duration is greater than 2 months and the longest flight lasted 109 days More than 150000 meteorological measurements were made
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Theoretical and Computational Fluid Dynamics, 2008
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Theoretical and Computational Fluid Dynamics, 1992
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Quarterly Journal of the Royal Meteorological Society, 2001
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Journal of Turbulence, 2003
Curved flows observed in aeronautical reversing systemsare studied using large eddy simulation(LE... more Curved flows observed in aeronautical reversing systemsare studied using large eddy simulation(LES).To estimate the prediction capabilities of LES, acurved mixing layer is first simulated. The major effect of curvature is to decrease the level of turbulent fluctuations, a decrease that is followed by an overshoot of fluctuations whenthe flow relaxes further downstream. These observations agree well with previous experimental investigations
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Journal of the Atmospheric Sciences, 1978
A method of parameterization of the energy and enstropy transfers involving subgrid scales is pro... more A method of parameterization of the energy and enstropy transfers involving subgrid scales is proposed in order to predict the time evolution of the energy spectrum at larger scales. The method is based on the strong non-localness of enstrophy transfer within the enstrophy inertial range of turbulence in two dimensions. It is applied first to a master equation derived from
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Journal of Geophysical Research, 2002
During the Indian Ocean Experiment (INDOEX) Intensive Field Phase, 17 superpressure balloons drif... more During the Indian Ocean Experiment (INDOEX) Intensive Field Phase, 17 superpressure balloons drifting at lower tropospheric levels were launched from Goa to sample the motion and meteorological characteristics of polluted air masses originating from the Indian subcontinent. The mass flow, as expected, is attracted to the Intertropical Convergence Zone (ITCZ), which is reached in about 7 days. Successive trajectories show
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Journal of Geophysical Research, 2001
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Journal of Geophysical Research, 1997
We study the dynamics of passively advected tracers in the Antarctic polar vortex, using the wind... more We study the dynamics of passively advected tracers in the Antarctic polar vortex, using the wind fields provided by the European Centre for Medium-Range Weather Forecasts' (ECMWF) analysis from August to October 1993. Advection on both isopycnal (0.0938kg/m3) and isentropic surfaces (470°K) is considered. A new definition of the vortex edge, identified as the maximum of kinetic energy, is compared
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Journal of Fluid Mechanics, 2003
Energy transfers between modes obtained from the proper orthogonal decomposition (POD) of a turbu... more Energy transfers between modes obtained from the proper orthogonal decomposition (POD) of a turbulent flow past a backward-facing step are analysed with the aim of providing guidelines for modelling unresolved modes in truncated POD Galerkin models. It is observed that energy transfers are local in the POD basis, and that the Fourier-decomposition-based concepts of forward and backward energy cascades are
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Journal of Computational Physics, 2001
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Journal of Computational Physics, 2005
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Journal of Atmospheric and Oceanic Technology, 2007
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Geophysical Research Letters, 2002
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Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy, 2000
ABSTRACT
Bookmarks Related papers MentionsView impact
Comptes Rendus de l Académie des Sciences - Series I - Mathematics
Bookmarks Related papers MentionsView impact
IUTAM Bookseries, 2009
A high-resolved Large Eddy Simulation (LES) of the flow around an airfoil near stall has been ach... more A high-resolved Large Eddy Simulation (LES) of the flow around an airfoil near stall has been achieved. We have observed that the laminar boundary layer undergoes a quick transition to turbulence in a Laminar Separation Bubble (LSB) close to the leading edge of the airfoil profile. The flow structures in this transitional flow region have been analysed and the transition
Bookmarks Related papers MentionsView impact
Lecture Notes in Physics, 1990
Without Abstract
Bookmarks Related papers MentionsView impact
Journal of The Atmospheric Sciences, 1981
The régime flows corresponding to the barotropic nondivergent equation with forcing, drag and sub... more The régime flows corresponding to the barotropic nondivergent equation with forcing, drag and subgrid-scale dissipation are studied using spectral model on the plane and on the sphere. The flow régimes obtained exhibit clear evidence of the existence of an enstrophy-cascading inertial range, together with a reverse energy cascade toward small wavenumbers. It is shown, however, that the enstrophy cascade is
Bookmarks Related papers MentionsView impact
Physics and Chemistry of the Earth, 1995
The STRATÉOLE experiment is designed to study the wintertime Antarctic lower stratosphere polar v... more The STRATÉOLE experiment is designed to study the wintertime Antarctic lower stratosphere polar vortex and its springtime breakdown. To this end, it is planned to fly a large number (around 200) of long-lived (3 months), small isopycnic drifting balloons instrumented with temperature and pressure sensors, GPS and transmitters. The main goal of STRATÉOLE experiment is to provide an unprecedented documentation
Bookmarks Related papers MentionsView impact
In September and October 2005 27 superpressure balloons SPB were launched from McMurdo 167 E 78 S... more In September and October 2005 27 superpressure balloons SPB were launched from McMurdo 167 E 78 S a station in Antarctica SPBs are able to drift for months in the lower stratosphere at a constant density level The mean flight duration is greater than 2 months and the longest flight lasted 109 days More than 150000 meteorological measurements were made
Bookmarks Related papers MentionsView impact
Theoretical and Computational Fluid Dynamics, 2008
Bookmarks Related papers MentionsView impact
Theoretical and Computational Fluid Dynamics, 1992
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Quarterly Journal of the Royal Meteorological Society, 2001
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Journal of Turbulence, 2003
Curved flows observed in aeronautical reversing systemsare studied using large eddy simulation(LE... more Curved flows observed in aeronautical reversing systemsare studied using large eddy simulation(LES).To estimate the prediction capabilities of LES, acurved mixing layer is first simulated. The major effect of curvature is to decrease the level of turbulent fluctuations, a decrease that is followed by an overshoot of fluctuations whenthe flow relaxes further downstream. These observations agree well with previous experimental investigations
Bookmarks Related papers MentionsView impact
Journal of the Atmospheric Sciences, 1978
A method of parameterization of the energy and enstropy transfers involving subgrid scales is pro... more A method of parameterization of the energy and enstropy transfers involving subgrid scales is proposed in order to predict the time evolution of the energy spectrum at larger scales. The method is based on the strong non-localness of enstrophy transfer within the enstrophy inertial range of turbulence in two dimensions. It is applied first to a master equation derived from
Bookmarks Related papers MentionsView impact
Journal of Geophysical Research, 2002
During the Indian Ocean Experiment (INDOEX) Intensive Field Phase, 17 superpressure balloons drif... more During the Indian Ocean Experiment (INDOEX) Intensive Field Phase, 17 superpressure balloons drifting at lower tropospheric levels were launched from Goa to sample the motion and meteorological characteristics of polluted air masses originating from the Indian subcontinent. The mass flow, as expected, is attracted to the Intertropical Convergence Zone (ITCZ), which is reached in about 7 days. Successive trajectories show
Bookmarks Related papers MentionsView impact
Journal of Geophysical Research, 2001
Bookmarks Related papers MentionsView impact
Journal of Geophysical Research, 1997
We study the dynamics of passively advected tracers in the Antarctic polar vortex, using the wind... more We study the dynamics of passively advected tracers in the Antarctic polar vortex, using the wind fields provided by the European Centre for Medium-Range Weather Forecasts' (ECMWF) analysis from August to October 1993. Advection on both isopycnal (0.0938kg/m3) and isentropic surfaces (470°K) is considered. A new definition of the vortex edge, identified as the maximum of kinetic energy, is compared
Bookmarks Related papers MentionsView impact
Journal of Fluid Mechanics, 2003
Energy transfers between modes obtained from the proper orthogonal decomposition (POD) of a turbu... more Energy transfers between modes obtained from the proper orthogonal decomposition (POD) of a turbulent flow past a backward-facing step are analysed with the aim of providing guidelines for modelling unresolved modes in truncated POD Galerkin models. It is observed that energy transfers are local in the POD basis, and that the Fourier-decomposition-based concepts of forward and backward energy cascades are
Bookmarks Related papers MentionsView impact
Journal of Computational Physics, 2001
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Journal of Computational Physics, 2005
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Journal of Atmospheric and Oceanic Technology, 2007
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Geophysical Research Letters, 2002
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