| 1. | Présentation PowerPoint |
| | A Typical Atmospheric Convective System ? : ~ 200km cumulus convection (convective towers) ~ 20km stratiform clouds (mesoscale)... Organized Convection (Squall-Line) ?... NAM-SCA Framework can numerically generate an organized convection (Archetype) :... |
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| 2. | DNS of turbulent RayleighBénard Convection |
| | DNS of turbulent RayleighBénard ConvectionIntroductionResolution... NS of turbulent Rayleigh-Bénard Convection. Olga Shishkina. 1 2... Introduction Governing equations and numerical method DNS of turbulent thermal convection Thermal and viscous boundar y layers Complexity of Direct Numerical Simulations Resolution requirements in the boundar y layers. |
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| 3. | ONERA - Aerodynamics and Energetics Modeling (DMAE) - References |
| | Simultaneous measurements of speed and temperature fields in natural convection... |
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| 4. | ONERA - Aerodynamics and Energetics Modeling (DMAE) - Publications |
| | Stabilité d'un écoulement de convection naturelle en milieu confiné - Caractérisation dynamique par PIV et approche numérique... SFT, Groupe " Modes de transfert - Convection ", Journée d'études sur les instabilités thermoconvectives, 12/03/08, Paris... Dynamic characterization of an unstable confined natural convection flow using particle image velocimetry... |
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| 5. | Optical diagnostics in hypersonic flows and in the upper atmosphere - ONERA / DMPH-EN |
| | Convection of a plasma column induced by a pseudo-spark electron gun in the F4 wind tunnel.... |
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| 6. | Three-component or Stereo plane PIV at ONERA DAFE - ONERA / DAFE-EN |
| | Based on these measurements, Davoust and Jacquin 3 have in particular derived a new method to determine local convection velocities of the coherent structures and assess the validity of Taylor's approximation.... References 1 Raffel M., Willert C., Wereley S., Kompenhans J., Particle image velocimetry : a practical guide, Springer-Verlag, 2007. 2 Davoust S., Jacquin L., Leclaire B., Dynamics of m=0 and m=1 modes and of streamwise vortices in a turbulent axisymmetric mixing layer, submitted to the J. Fluid Mech. 3 Davoust S., Jacquin, L., Taylor's hypothesis convection velocities from mass conservation equation, Phys.... |
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| 7. | Aerothermodynamics - ONERA / DAAP-EN |
| | The real geometries are complex, with discontinuities in order to improve the exchanges by convection.... |
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| 8. | No title |
| | THE ROLE OF THE TURBULENT BACKGROUND IN THERMAL CONVECTION... Shishkina@dlr.de ABSTRACT The turbulent background in thermal convection is characterized by low values of the thermal dissipation rate.... To determine quantitatively the role of the turbulent background in thermal convection we evaluate the functions and (introduced in 1) from the DNS and LES data generated for turbulent Rayleigh - Benard convection in wide cylindrical containers of the aspect ratios = 5 and 10 for the Rayleigh numbers ' Ra = 105, 106, 107, 108. It is shown that both the volume of the fluid which corresponds to the turbulent background and the contribution of the turbulent background to the volume averaged thermal dissipation rate increase with the Rayleigh number.... |
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| 9. | Microsoft PowerPoint - TI2006 ShishkinaWagner |
| | The role of the turbulent background in thermal convection... Analysis of thermal dissipation rates in turbulent Rayleigh-Bénard convection, JFM 546, p. 51-60.... Thermally driven convection plays an important role in many technical applications and in our daily life.... Detailed investigations of the 3D velocity and temperature fields in thermally driven turbulent convection are rare.... |
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| 10. | PowerPoint Presentation |
| | Convection is skew-symmetric... |
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