Compressible flow [Fluid Mechanics #18]

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In today's video we introduce the complicated and vast world of compressible flows. Until now in this series, we have assumed density was constant. Now, we allow density to change, due to the flow, and lots of interesting things happen.
We will go over what compressible flow is physically, how to tell if flow is compressible via the Mach number and comparing Kinetic and Internal fluid energy, how we analyze compressible flows through new conservation equations and a separate set of Thermodynamics equations, and salient features of compressible flows like Shock waves. In practice, compressible flows are critical in aerodynamics and influence vehicle design, material choice, and body forces.
Free downloadable notes (PDF with white background) can be found at my website: sites.udel.edu/vanburen/educa...

Опубликовано:

24 июл 2024

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Комментарии : 6

@esackchan5635 2 месяца назад

Good Vid

@prof.vanburen 2 месяца назад

Hey thanks!

@wildphysicspianoboy97 8 месяцев назад

Can you explain from where do you derive the "new" terms in min: 12:37 please?

@prof.vanburen 6 месяцев назад

Great question! While I cover these equations multiple times across the fliuds/aero lectures, I do not do an explicit derivation of the new compressible terms in the same way I do the incompressible ones. I tend to gravitate to connecting physical intuition to terms instead of perfect derivations, unfortunately. You might find the NASA resources helpful: www.grc.nasa.gov/www/k-12/airplane/nseqs.html. Hope this helps!

@Indonesia01ian 2 года назад

hi sir. I want to ask a question. if there are two conditions of compressible fluid flow in the same flow area but at a different speeds. why the higher velocity flow has a lower static pressure?. is it the same as the incompressible flow caused by the dynamic pressure? thanks

@prof.vanburen 2 года назад

Hi! While I am certainly no compressible flow expert, I think you're on the right track of thinking. My interpretation is that it velocity and pressure still have the same trends in compressible flow as in incompressible flow, but compressible flow just means you need to account for other flow property changes, which is why you can't use Bernoulli's equation. Does this help?