Comparing assimilation techniques for pressure and temperature fields in Rayleigh-Bénard convection

Kurzfassung

Velocity fields of flows can be measured precisely on temporal and spatial scales, e.g., by particle tracking velocimetry (PTV) [1,6]. Many interesting flows in scientific or industrial contexts, e.g., the ventilation of closed passenger cabins [5], are temperature-driven and it is a challenging task to also measure the temperature field with the same resolution as the velocity fields. Käufer et al. showed in [3] that it is indeed possible to measure the temperature field on the same scales as the velocity field by using thermo-liquid crystals as tracer particles for PTV. This method is intriguing but difficult to realize in general setups since a specific fluid medium is required to make the thermo-liquid crystals buoyancy neutral.