Visualization of Turbulence Anisotropy in the In-cylinder Flow of Internal Combustion Engines
Anisotropy is one of the most important characteristics of turbulent flows. In internal combustion engines, anisotropy significantly influences processes such as mixture formation and flame propagation. There are many different visualization strategies in the literature that make the impact of anisotropy on specific parameters more accessible for analysis. However, traditional methods are unable to display anisotropy directly in the physical domain. Instead, they use invariant maps, leading to the loss of important information. Thus, interpretation of the results becomes difficult especially when a large number of data points exist. This paper overcomes this shortcoming by visualizing turbulence anisotropy directly in the physical domain. Through the application of componentality contours, the anisotropic properties of turbulence in the three-dimensional engine geometry are directly visualized; the focus is on non-reactive flows.