#DragReduction

[engineering-courses]

What is a wake region, and why is it so crucial in aerodynamics? In this video, we delve into the fascinating world of fluid dynamics to explore the wake region—the area of recirculating flow behind a moving or stationary object.

Discover how this phenomenon impacts everything from drag and stability to the efficiency of vehicles and structures. Using examples like flow over cylinders and vehicles, we’ll explain why wake regions create low-pressure zones, induce drag, and shed vortices.

Learn why studying and controlling wake regions is vital in external aerodynamics, ensuring better performance and stability at high speeds.

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[nakedfluiddynamics-blog]

Sharks are indeed amazing animals. First they are not completely cartilaginous fishes! They have bones!!!Well in facts more like teeth with bones in it but on their skins. Their skin is covered in denticles which are composed of an outer enameloid layer and an inner bone-like layer. But most interestingly to us here is the effect of these denticles on their hydrodynamics. Indeed sharks are amazing swimmers and their skin has to do with it. George Lauder and co-authors have investigated this using 3 D printed inspired shark skin. The benefit is that contrary to traditional technique of shark skin study, where actual shark skin is used and then sanded (thus removing material), here the skin is 3D printed and the amount of mass well control as well as the reference flat “skin”. The results are even more interesting: they found that at “low speed” the shark like skin experienced drag reduction of about 9% and that while control in motion they could in certain swimming program measure an increase in self propelled velocity and a reduction of cost of swimming at the same time. It means that shark can save a lot of energy while swimming at low speed and as they swim all the time on a lifetime this is a significant save of energy. This study also shows that the roughness can help achieve highest speed at lower cost making shark great swimmers! The figure here shows a lemonshark and the denticles. credit images: image1: By Albert kok image2: By Pascal Deynat Reference: Biomimetic shark skin: design, fabrication and hydrodynamic function, Li Wen, James C. Weaver and George V. Lauder, J. of Exp. Biology (2014) 217 (1656-1666 doi:10.1242/jeb.097097 ) [openaccess] #nakedfluiddynamics #fluiddynamics #fluidmechanics #physics #physique #science #shark #sharkweek #sharkskin #dragreduction #swimming #swimsuit #picoftheweek #picoftheday #awesome #mindblown #beautiful #scienceisart #scienceisfun #scienceisawesome #share #like #follow