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Grossi F.,CNRS Fluid Dynamics Institute of Toulouse | Braza M.,CNRS Fluid Dynamics Institute of Toulouse | Hoarau Y.,Institute Of Mecanique Des Fluides Et Des Solides Of Strasbourg
Notes on Numerical Fluid Mechanics and Multidisciplinary Design | Year: 2012

In the present paper a Delayed Detached-Eddy Simulation (DDES) based on the strain-adaptive linear Spalart-Allmaras (SALSA) model is performed in order to investigate the transonic flow over the OAT15A supercritical airfoil within the buffet regime. The results are compared with 2D and 3D-URANS computations using the SALSA model, as well as with experimental data. This study shows improvements achieved in the prediction of the flow unsteadiness and statistics by means of the DDES. © 2012 Springer-Verlag Berlin Heidelberg.

Larrarte F.,Institute francais des science et technologies des transports | Francois P.,Institute Of Mecanique Des Fluides Et Des Solides Of Strasbourg
Water Science and Technology | Year: 2012

Ultrasonic flow meters are commonly used in wastewater management. Under certain circumstances, a reduction in the flow meter range may occur and cause significant error in the flow rate measurement. Attenuation due to suspended particles is one of the phenomena capable of reducing the flow meter range. The present paper examines attenuation resulting from re-suspended pond sediment over a wide range of concentration values. It appears that a formula established for sand suspensions provides a good estimate of ultrasound attenuation for these types of particles as well. Experiments conducted for wastewater under particle concentrations commonly encountered in sewer networks demonstrate that the attenuation by particles only contributes to a negligible extent towards intensity decay, in accordance with theoretical predictions. We also theoretically determine herein the operating conditions under which the range of an ultrasonic flow meter would be significantly reduced due to particle attenuation. © IWA Publishing 2012.

Schmitt V.,Institute Of Mecanique Des Fluides Et Des Solides Of Strasbourg | Dufresne M.,Institute Of Mecanique Des Fluides Et Des Solides Of Strasbourg | Vazquez J.,Institute Of Mecanique Des Fluides Et Des Solides Of Strasbourg | Fischer M.,Institute Of Mecanique Des Fluides Et Des Solides Of Strasbourg | Morin A.,Hydroconcept ZA Trappes Elancourt
Houille Blanche | Year: 2013

This study takes part in a research project on CFD modelling of stormwater treatment structures. Despite of the progress in CFD modelling, the complexity of such devices (geometry, adjustments,...) generates some difficulties on mesh generations. In the case of the CycloneSep separator, the solution is to use a multiscale approach. This method allows us to visualize local phenomena that occur nearby the screen, but also the global hydrodynamic behavior of the device. This article summarizes the multiscale methodology developed, the validation of the method by comparison with experimental measurements and the application of the methodology to the in situ CycloneSep of Trouville/Mer. © 2013 Société Hydrotechnique de France.

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