The next speaker in our student seminar series will be Amir Behnamian. Amir will be giving a talk titled “Measurements of scalar probability density functions and conditional expectations in uniformly sheared turbulence”.
Where: STE H0104
Date: Wednesday May 7th, 2014
The abstract of the talk is given below. Hope to see you all there!
Measurements of scalar probability density functions and conditional expectations in uniformly sheared turbulence
Candidate: Amir Behnamian
Supervisor: Dr. Stavros Tavoularis
High resolution, multi-sensor, hot/cold-wire measurements were made in passively heated, uniformly sheared turbulence in a wind-tunnel. Measurements were focused on terms in the scalar PDF equation that require closure models. Unlike previous studies, which considered a single combination of velocity and scalar fields at a time, we investigated three different scalar fields embedded in the same nearly homogeneous turbulence with three passively superimposed temperature fields, namely a transversely homogeneous temperature field with a uniform mean gradient, and two inhomogeneous temperature fields, the plume of a heated line source and a thermal mixing layer. The use of uniformly sheared flow allowed us to isolate the effects of scalar inhomogeneity and initial conditions by evaluating the results in the three scalar fields. Thus, the measurements covered a wide range of scalar field conditions and set the ground for a conclusive comparison.