PIV and hot wire measurements in the far field of turbulent round jets

We present correction procedures that compensate for the limited spatial resolution of particle image velocimetry (PIV) and hot wire anemometry (HWA) measurements. Both techniques provide two components of the velocity vector. The correction method, which is based on DNS velocity fields, is then applied to measurements in the far field of two round jets at a turbulent Reynolds number of about 179, for PIV, and 370, for HWA. Both large- and small-scale quantities are discussed. Amongst the latter, the correction of the velocity derivative variance is larger for the PIV data than for the HWA data. However, the opposite is true for the correction of the isotropy ratios of the velocity derivatives. After compensation, the two techniques provide similar values of the mean energy dissipation rate and also of one isotropy ratio.