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Visualization of vorticity and vortices in wall-bounded turbulent flows

A. Helgeland ; Anders Reif (Institutionen för tillämpad mekanik) ; O. Andreassen ; C. E. Wasberg
Ieee Transactions on Visualization and Computer Graphics (1077-2626). Vol. 13 (2007), 5, p. 1055-1066.
[Artikel, refereegranskad vetenskaplig]

This study was initiated by the scientifically interesting prospect of applying advanced visualization techniques to gain further insight into various spatio-temporal characteristics of turbulent flows. The ability to study complex kinematical and dynamical features of turbulence provides means of extracting the underlying physics of turbulent fluid motion. The objective is to analyze the use of a vorticity field line approach to study numerically generated incompressible turbulent flows. In order to study the vorticity field, we present a field line animation technique that uses a specialized particle advection and seeding strategy. Efficient analysis is achieved by decoupling the rendering stage from the preceding stages of the visualization method. This allows interactive exploration of multiple fields simultaneously, which sets the stage for a more complete analysis of the flow field. Multifield visualizations are obtained using a flexible volume rendering framework, which is presented in this paper. Vorticity field lines have been employed as indicators to provide a means to identify "ejection" and "sweep" regions, two particularly important spatio-temporal events in wall-bounded turbulent flows. Their relation to the rate of turbulent kinetic energy production and viscous dissipation, respectively, has been identified.

Nyckelord: three-dimensional vector field visualization, unsteady flow, visualization, time-varying volume data, features in volume data sets, multifield visualization, fluid dynamics, turbulence, VECTOR-FIELDS, UNSTEADY-FLOW, VORTEX, IDENTIFICATION, MODELS



Denna post skapades 2009-01-19.
CPL Pubid: 88523

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur