Abstract: Turbulent flows and their modeling have found wide-ranging applications in various fields such as automobile engineering, drug development, the food industry, wind/tide energy harnessing, disease diagnosis, and more. However, the features and structures in turbulent flows are in different scales and often tangled with each other in space, posing significant challenges when it comes to extract and separate them for the understanding of the underlying mechanisms of turbulent flows. Among these different features and structures, coherent structures are particularly interesting to the experts, as they play a crucial role in characterizing important turbulent mechanisms. In this talk, I will provide an overview of several recently developed techniques by our research group for the extraction and visualization of coherent structures in different turbulent flows. Firstly, I will introduce some techniques designed for extracting and separating vortices, a prominent example of coherent structures. Next, I will present a selection of techniques that aim to separate large-scale coherent structures from the smaller ones. To conclude, I will highlight the remaining challenges in turbulent flow analysis and visualization to motivate future work.