Volume reconstruction of an impinging jet obtained from stereoscopic-PIV data using POD

Ventilation and air conditioning systems are specified by the configuration of jets which may interact with sharp edges when travelling from the nozzle. These configurations could in some cases be a source of aeraulic and acoustic discomfort. In order to solve this disadvantage, the volumetric flow dynamics involved in these configurations should be understood and controlled. The objectives of the present study is to reconstruct and analyse the volume using stereoscopic PIV measurements (SPIV). To do so, an experimental platform has been developed to generate a flow at different Reynolds numbers. The dynamics of these flows are investigated experimentally using the PIV technique. The kinematic fields of parallel planes are measured by SPIV acquisitions in order to study the corresponding fluid flow. The snapshot proper orthogonal decomposition technique (POD) is applied in order to obtain the most energetic modes of the jet. Three modes were sufficient to reconstruct each of the measured planes. A trigger signal was chosen to determine the phase of the planes which are unsynchronized. The volume is afterwards, obtained by an interpolation of the reconstructed planes. This reconstruction is highlighted in order to study the dynamics of the transverse vortices. Several vortex detection criteria have been tested to locate and analyse the vortex structures.