Effect of free surface on the hydrodynamics of plates in cross-flow
Cylinders and flat plates oriented normal to the flow are typical bluff bodies, characterized with large regions of separated flow and a significant pressure drag component. The study of forces generated by bluff bodies has been one of the oldest problems in fluid mechanics, studied initially using free streamline theory and the modified hodograph plane theory. These canonical bodies are also used extensively in several industrial sectors, ranging from oil & gas, transportation to energy. There is a good amount of literature on the interaction between cylinders and boundaries, but very little information is available related to the interaction between flat plates and deformable boundaries. This lack of information is even more apparent when plate aspect ratio is considered as well. With this in mind, this talk focuses on hydrodynamics of plates in cross-flow near the free surface over a range of aspect ratios, Reynolds numbers, and submergence depths. Later, a few strategies for drag control, namely structural flexibility and strategic porosity are also presented.
Typologie d'événements: Seminars
Webinaire FTC: HOW PLANTS AND TREES CAN INSPIRE US OR TALKING ABOUT PLANT BIOMECHANICS de Gustavo VARGAS-SILVA
Trees are the largest living beings that have ever lived on Earth, with more than one hundred meters high, masses of several thousand tons, and ages of several thousand years. In order to achieve this, among other functional conditions, trees must cope with all kinds of mechanical loads. On that line of thought, this lecture presents some of the most important strategies of growth, anatomy and morphology that plants and trees use, from a biomimetic approach, to meet structural requirements. The idea is to highlight how species of the plant kingdom can serve as biomechanic models in engineering, architecture and industrial design applications. Special emphasis will be placed on the relationship between the structure and function of some plant systems to study materials and technological solutions, or simply to wonder with the wisdom of nature.