F1 - Flow Visualization

Organizer: P. Mattern

Philipp Mattern finished his studies of mechanical engineering at Karlsruhe Institute of Technology (KIT), Germany with his master project on "Experimental PIV- measurements in the wake of a cylinder with elastic structure attachment" at the Institute of Fluid Machinery (FSM), KIT, Karlsruhe, Germany in 2010. He obtained his PhD in April 2016 while working as scientific assistant at the FSM on the topic of "Flow field analyses within a regenerative flow pump: the power of periodic dynamics". Main interest lied in PIV measurements on fluid machinery as well as the connected post processing and data analysis. This includes both, time resolved as well as stereoscopic measurements. His special interest centered around flow pattern identification in fluid machinery by means of modal analysis (e.g. Proper Orthogonal Decomposition, POD). Since October 2016 he is working as project manager at ILA_5150 in Aachen, Germany, a small company dedicated to PIV on industrial scale, as well as in the field of academic research. The dedication is towards various topics, using lasers or high power LEDs as illumination source. Key features are fully automated, integrated robotic PIV Systems (RoboPIV) in full scale automotive wind tunnels in the field of motorsport, as well as complete PIV solutions from small educational systems up to time resolving Stereo-PIV Systems. In addition to the traditional PIV, other optical measurement techniques, such as Pressure Sensitive Paint (PSP) and stereoscopic deformation measurements are in the field of interest.


The variety of flow visualization techniques are invaluable tools in every fluid dynamicist toolbox. While hardware demands differ from case to case, image acquisition can be considered as the backbone of for most techniques in our digitized world. Particle Image Velocimetry (PIV) serves as a good example to undermine this statement, as it can be considered as the most common method for quantitative flow field measurements. Since its early beginnings in the eighties, it has matured into a reliable tool, used by researchers all around the globe. Being a complex measurement technique, hardware demands are still challenging. While progress has been made for every single necessary component, the ongoing development in the field of digital image acquisition, as well as image correlation techniques were especially beneficial for PIV. Different approaches from various research fields were taken into account to push PIV further. In addition to that, various other (flow) visualization techniques took benefit of the continuously advancing progress in digital image acquisition. Methods such as Shadowgraphy, Schlieren techniques or (laser) light-induced fluorescence analysis (LIF,PSP,...).

This forum is dedicated to keep the idea of interfaculty exchange alive and serves within the ISIMet as a platform to present novel approaches in the field of flow visualization, as well as other optical measurement techniques.

Single Camera 2D-2C PIV Raw Image Data sequence of a toy-scale F1 racecar in DEHS gathered with 1000 fps

Flow Velocity visualization using PIV for a single image pair from the sequence in the movie above

Non-exhaustive list of suggested topics

- Image / raw data quality estimation

- Recent developments in PIV, PSP, LIF, BOS, Shadowgraphy,...

- Novel approaches in Hard- / Software usage

- Interdisciplinary method transfer

- Combined approaches

Keynote lecture

to be announced soon !