Flow measurement and computational fluid dynamics: contribution to the assessment and control of uncertainties on mean velocity measurement

摘要

Sewer network managers are more and more implementing discharge sensors within sewer networks. When no permanent relation exists between the local water depth and discharge, velocity sensors are usually installed. In such case, the velocity values measured by these sensorS must be extrapolated to reach the averaged velocity across the flow section. This extrapolation implies uncertainties which are difficult to assess. 3D modelling of the velocity field allows to simulate the response of sensors for assessing these uncertainties, and reduce them by numerical calibration. In the following text, the general methodology is first introduced and then applied to two case studies, including a bend flow and a complex section configuration.