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I can relate to this

so i put together a couple of sites and links that are pretty helpful for studying, school etc, :) all the links are free and work and are all pretty useful so enjoyyyyy - ellie x

music

chill playlist

concentration playlist

study playlist

coffee shop blues

relaxation

studying/school help

maths help

calculators (includes graphing, geometric, stats etc)

microsoft word equivalent

coffee shop sounds

how to study guide

essay structure guide

help in a ton of subjects

calm/nature sounds

flashcards

download free books

maths knowledge site

tips for a productive study break

falling asleep tips

how to google

how to wake up in the morning

improve your studying skills

teaches anything

other

food

thousands of quick and easy snack recipes

cheap & healthy snacks

quick and easy soup recipes

chocolate muffin in a mug tutorial

study snacks

40 on-the-go breakfast recipes

macaroni cheese / mac&cheese in a cup

stress relief

yoga poses

how long to nap

go to a quiet place

the thoughts room

take a guided relaxation

compliments generator

take a few minutes break

cute videos

vines

free hugs!

fun sites masterpost

motivation

earn a cute kitten picture after writing

how to get motivated

collegiate-confession

fieldnigga-deactivated20170517

meanplastic

fitnessfoodfabulous

janeplease

How to get hired at your local library

fuckyeahfluiddynamics

When I first studied fluid dynamics, one of the concepts I struggled with was that of Eulerian and Lagrangian reference frames. Essentially, these are just two different perspectives you can view the fluid from. Physics is the same in both, but mathematically, you approach them differently. In the Eulerian perspective one sits at a location and watches the flow pass, like an observer watching a river go by. It’s demonstrated in the top animation, where turbulent flow sweeps past in a pipe. This is the usual perspective experimentally - you put an instrument at a certain point in the flow and you gather information as the fluid streams past in time.

In the Lagrangian perspective, on the other hand, one follows a particular bit of fluid around and observes its changes over time. This means that one has to follow along at the mean speed of the flow in order to keep up with the fluid parcel one is observing. It would be like running alongside a river so that you can always be watching the same water as it flows downstream. The Lagrangian view of the same turbulent pipe flow is shown in the bottom animation. Notice how moving alongside the pipe makes it easier to see how the turbulence morphs as it goes along. Experimentally, this can be harder to achieve (at least in a flow with non-zero mean speed), but it’s a useful method of studying unsteadiness. (Image credit: J. Kühnen et al., source)