Velocity and Temperature Derivatives in High Reynolds Number Turbulent Shear Flow

In Sils-Maria, Engadin region, Switzerland, a hot-wire field experiment will be performed with the purpose of measuring velocity and temperature derivatives in high Reynolds number turbulent shear flow.

During the summer almost every afternoon a strong thermal wind is driven up the Maloja pass, through the entrance of the Engadin valley and over the lakes of Sils and Silvaplana. The test site is between these two lakes and provides a unique opportunity to perform such experiments at high Reynolds numbers which are inaccessible neither in laboratory nor via DNS.

A data set is to be obtained for all three components of the velocity fluctuations vector and all nine components of the velocity gradients tensor and the temperature gradient, as well as independent measurements of time derivatives along with corresponding data on the mean flow. An important aspect is that the Taylor hypothesis is not employed in these measurements.

The experiments are performed in cooperation with the Department of Fluid Mechanics of Tel-Aviv University. They developed the experimental facility and methodology and used the equipment in similar field experiments in Israel. The system consists of a multi-hot-wire probe, automatic three-dimensional calibration unit for use in field experiments and corresponding calibration procedure (including software), and data acquisition and processing system. The facility will be modified with the appropriate additions necessary to implement the experiment at the Sils-Maria site.

More information of the project can be downloaded here.

Contacts

K. Hoyer, B. Lüthi, T. Blunschi

Agency/Funding

Own resources of the professorship

Partners

Department of Fluid Mechanics, Tel-Aviv University

Status

Running