Proper orthogonal decomposition of turbulent flow around a finite blunt plate

In this article, proper orthogonal decomposition (POD) and Extended POD are applied to reveal the relationship between coherent vortices and wall physics of a flow over a finite blunt plate, with a Reynolds number ( R e d ) of 1.58 × 10 4 . The flow is simulated by improved delayed detached eddy simulation method. The predicted results are in good agreement with previous experimental and numerical investigations in terms of statistical properties and unsteadiness. Four typical coherent structures are found by using POD, that is shedding mode, flapping mode, Kármán mode and force mode. Then, Extended POD is used to analyze the coherent structural features and their relation to wall pressure fluctuations. It is concluded that wall pressure fluctuations are a combined results of all of the main structural features with different significant influencing region, while lift unsteadiness is mainly attributed to wake dynamics, especially the force mode. Graphical Abstract