| 1. | Metrology - Understanding the Turbulence that Causes Jet Noise - Onera |
| | The jet flow studied in this wind tunnel has a high Reynolds number (200,000), which means that the turbulence studied is fully developed.... The measurement of velocity and charactérization of turbulence through PIV under these conditions constitutes a real achievement since these measurements are usually performed at much lower Reynolds numbers.... |
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| 2. | Viscous Interactions and Separation in Hypersonic Flow - ONERA / DAFE-EN |
| | The experiments carried out on a cylinder-skirt model in the R5Ch low Reynolds number wind tunnel allowed us to create an unequalled completely laminar test case that has been widely by the international community for validating the codes solving the Navier-Stokes equations, or those using the DSMC (Direct Simulation by Monte-Carlo) approach.... |
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| 3. | Large Eddy Simulation (LES) - ONERA / DSNA-EN |
| | As the use of LES for simulating realistic vortex flows (geometry, Reynolds number, etc.) often proves to be too costly in computing time, the aim of current research is to reduce the cost of this approach.... |
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| 4. | Direct Numerical Simulation (DNS) - Transport aircraft wake vortices - ONERA / DSNA-EN |
| | The limitations are then of a technical order, i.e. computer memory capacity limits the number of discretization points and consequently the Reynolds number of the application considered.... |
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| 5. | Mars Sample Return Orbiter in the R5Ch Hypersonic Wind Tunnel - ONERA / DAFE-EN |
| | The study entrusted to the Onera by the Cnes in this first phase of the program involves testing a 1 : 50 scale replica of the orbiter in the R5Ch low Reynolds number hypersonic wind tunnel.... |
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| 6. | Aeroacoustics - ONERA / DAAP-EN |
| | This consisted of 16 rods rotating in front of 18 shaped blades (NACA 010-35). The calculation was performed using a laminar approach given the low Reynolds number based on the diameter of the rods (3 mm).... |
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| 7. | Micro-Turbine - ONERA / DAAP-EN |
| | Due to the dimensions in question (about 20 mm), the machine operates at low Reynolds numbers (between 5,000 and 50,000). This type of configuration causes a large amount of friction on the walls and higher heat transfers than in a conventional turbine.... 1). In order to optimize the performances, a better understanding of the low Reynolds number effects is needed.... |
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| 8. | Large Eddy Simulation (LES) : Turbulent jet / wake vortex interaction - ONERA / DSNA-EN |
| | To understand the complex process of the entrainment and the mixing of a turbulent jet in the wake, represented by a Lamb-Oseen vortex, a temporal large eddy simulation of the interaction between a turbulent jet and a wake vortex was carried out by solving the compressible Navier-Stokes equations at Mach number 0.2 and a Reynolds number of 5000. The axes of the jet and the vortex are sufficiently well separated not to interact immediately, the vortex velocity causes the jet to be pulled around the vortex, the core of which is not altered.... |
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| 9. | Votex Street at the Back of a Circular Cylinder - ONERA's Science Pictures |
| | Votex Street at the Back of a Circular Cylinder copyright © ONERA 1996-2006Votex street at the back of a circular cylinder (Reynolds number = 138) (). Pictures. |
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| 10. | Conference - Turbulence and Interactions - Porquerolles - 29 May - 2 June 2006 |
| | Statistics at small scales in DNS of turbulence - Dependence on Reynolds number and length scale... DNS of a turbulent channel flow with streamwise rotation at different Reynolds numbers... Implications of turbulence interactions : a path toward addressing very high Reynolds number flows... Direct numerical simulation in a lid-driven cavity at high Reynolds number... |
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