Celebrating the physics of all that flows with Nicole Sharp, Ph.D.
- Profile
APS DFD 2017
This year’s American Physical Society Division of Fluid Dynamics meeting starts this Sunday. I have a couple events scheduled: – Student Lunch, Monday, November 20, 12:55-13:45 (sold out) – FYFD: Getting started in science communication, Monday, November 20, 16:44-16:57, Four Seasons Ballroom Yes, the ballroom! If you’ve ever struggled to get into an FYFD talk,…
Lagoon Flows
The meeting of land and sea often creates a rich and colorful environment. This satellite image shows Mexico’s Laguna de Términos, a coastal lagoon off the Gulf of Mexico. A skinny barrier island forms the lagoon’s two connections to the ocean; the eastern side is the usual inlet (right), while the western side forms an…
FYFD Merch!
FYFD now has an online store! Whether you’re into stickers or t-shirts, experimental fluid dynamics or CFD, we’ve got you covered. I’m running a special introductory sale through December 15th – holiday shopping anyone? – so it’s a great time to grab some merch! See a design you want available on more products? Got a concept…
Pigeon Flutter
Birds are well-known for their vocalizations, but this isn’t their only way to produce noise. A new study on crested pigeons finds that the birds’ wings produce distinctive high and low notes during take-off. A low note takes place during each upstroke, and a high note is heard during the downstroke. A major source of…
Oceans of Clouds
One of the most amazing things about fluid dynamics, in my opinion, is that the same rules apply across an incredible array of situations. The equations of motion are the same whether your fluid is water, air, or honey. Your flier can be a Cessna airplane or a fruit fly; again, the equations are the…
Emulsions By Condensation
Oil and water are hard to mix, as any salad dressing aficionado will attest. Technically, the two fluids are immiscible – they won’t mix with one another – but one way around this is to emulsify them by distributing droplets of one in the other. This is usually accomplished by shaking or using sound waves…
Oil Splatters
Most cooks have experienced the unpleasantness of getting splattered with hot oil while cooking. Here’s a closer look at what’s actually going on. The pan is covered by a thin layer of hot olive oil. Whenever a water drop gets added – from, say, those freshly washed greens you’re trying to saute – it sinks…
Symmetric Wakes
Nature is full of remarkable patterns and moments of symmetry. This image shows the wake behind two rotating cylinders. Half of the cylinders are visible at the far left. The flow moves left to right. The cylinders are rotating at the same rate but in opposite directions, clockwise for the cylinder on top and counter-clockwise…
Schooling Together
Since the 1970s, fluid dynamicists have chased the idea that fish swim in schools for hydrodynamic advantage. The original 2D conception of the idea placed fish in a diamond pattern so that their wakes would constructively interfere and improve swimming efficiency. In nature, that exact pattern is rarely seen, possibly due to 3D effects or…
Convection Without Heat
Glycerol is a sweet, highly viscous fluid that’s very good at absorbing moisture from the ambient air. That’s why a drop of pure glycerol in laboratory conditions quickly develops convection cells – even when upside-down, as shown above. This is not the picture of Bénard-Marangoni convection we’re used to. There’s no temperature or density change…