Numerical modeling of a hot-wire anemometer in turbulent flows

The present thesis deals with the numerical modeling of an hot wire anemometer inside a turbulent channel flow at Re_tau=180 with heat transfer. There are two main approaches when studying turbulence: one could follow an experimental path or a numerical approach could be pursued. Experiments showed some issues when measuring turbulence with hot wire anemometry, spatial and temporal filtering are two examples of such problems. In the present work, numerical simulations were performed in order to validate a code that model a hot-wire probe inside a turbulent channel flow. Direct Numerical Simulation (DNS) solved through a spectral code were used to build such model, due to their high level of precision and resolution. A validation process was performed starting from Kim & Moin experience and Kasagi studies related to DNS of channel flow with passive scalar. Following this path we implement inside our code a line source of heat mimicking the hot-wire behaviour. While simulations were running we collected statistics in order to know the values regarding turbulence fluctuations throughout the entire channel. We obtained a new data-set coming from DNS and spectral element method with not only just a passive scalar but a precise implementation of an hot-wire probe.