Abstract
A series of laboratory and numerical experiments were carried out to study the structure of the turbulent flow over a rectangular obstacle for high Reynolds number. The results of numerical simulation performed within ANSYS CFX were verified on data obtained in the wind tunnel of IAP RAS by visualization methods including Particle Image Velocimetry. It was found that the airflow over the obstacle can be conditionally divided into main several regions: the region of the initiation of the detachment and formation shielding zone, the region of the maximum vertical separation and vortex development and the region of flow reattachment. Comparison of numerical calculations with the results of experiments showed that the physical processes of the airflow around model objects can be optimally modeled in a three-dimensional setting using the Detached Eddy turbulence model (DES) with central numerical differentiation scheme and allowed to select optimal parameters of calculation grid.
Highlights
Numerical simulation methods are widely used in modern studies of hydrodynamics including turbulent flows
For example methods based on combining RANS and LES approaches
During the demonstration experiments on studying the structure of the airflow over a rectangular obstacle we developed an approach which uses the Particle Image Velocimetry (PIV) method to study the general picture of the airflow over the obstacle
Summary
Numerical simulation methods are widely used in modern studies of hydrodynamics including turbulent flows. There are many papers devoted to purely experimental investigations of flow around obstacles of various shapes (including poorly streamlined): flows in cavities and near sharp angle surfaces, performed over a wide range of Reynolds numbers [9] - [13]. They mainly use various modifications of PIV-methods. In [21] numerical modeling of the flow around a rectangular obstacle was carried out together with subsequent validation using the PIV method but these results were obtained for low values of Reynolds numbers 269 – 475 corresponding laminar flows. The side view was captured by a high-speed camera NAC Memrecam HX-3
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