Lecture 1: Fluid Dynamics

So, let's let's start with unidirectional flow . Oh, here I should tell you my plan of action, my tentative plan of action . We have 4 hours, four three to four classes . And I have four I've made up four PowerPoints . I'm not quite finished with the fourth, but it'll come along . And so, the first one is on fluid dynamics that are relevant to sediment transport . And then there's one on sediment transport , one on bed forms and bed configurations , and finally one on sedimentary structures created by by flows . And I'm hoping to get one and maybe most of two today done because the third and fourth are heavy . They're long and heavy , and I think we need more than just 1 hour to do it . So, that's that's my point . It's been so long since I've given classes that I I can't really figure out how long presentation's going to take me cuz I might go over tangents and things like that . All right. Osborne Reynolds, famous name in in in fluid dynamics . And I'm mentioning him because he did a classic experiment way back in the late 1800s . A tank with a tube coming out of it and a valve at the bottom so that he could he could make a flow in the tube . And he had a little dye injection system as well cuz he wanted to see what happened to the dye in the flow . These are directly from his his sketches . So, in A, at low flows, the dye streams along in the tube without anything happening to it . Well, come on in. Or it might expand very slowly, but nothing much happens to it . Uh but when he increases the velocity, the dye wavers and then breaks into . And to visualize the turbulence, this is a sketch . He shows all these fluid eddies moving along . And um this is a classic experiment . So, I think this is a pretty good definition of turbulence . Um and a little bit more about turbulence . If you had a flow through a duct or a channel