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I shot this video of fog over the peak of Haleakalā, the easterly volcano on Maui, in 2019. Unlike the rest of the island, Haleakalā’s summit experiences a cold-summer Mediterranean climate (“one of the few locations in the world with this climate type”, according to Wikipedia) which makes it far cooler than the rest of the island, As the humid, water-dense air from sea-level travels up the slopes of Haleakalā, it forms a dense sea of clouds over the crater, creating a bizarre, alien-like landscape.

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After doing an oil change and fuel filter replacement on this car, we emptied the remaining fuel in the fuel filter to the oil tray. The sparkles in the tray are small metal shavings(not good), but it looked pretty cool!

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The pattern formed in the sand arises when the wind blows strongly enough to sweep up individual grains and disperse them across the dune.

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It looks as though there is turbulent flow from the beginning of this waterfall I spotted while in Yosemite. Also I thought the cloud formation was super cool, especially on the right as you can see it bending over the mountain.

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The thunderbirds at an airshow burning smoke oil not only showing the turbulent flow behind the aircraft but also allowing the viewer to more easily see the path of the aircraft.

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The boat is able to manipulate the air bags in the back of the boat to increase the size of the wake.

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Putting my ski boots on the other day, I noticed the melting snow was mixing with the parking lot mud to create a beautiful little natural flow visualization! Funny place to spot it, but it was too pretty not to share.

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This temporary lava lamp solution demonstrates buoyancy forces through the displaced volume of the droplets of the cooking oil, which have lesser density than the water solvent, leading to its rise to the top of the fluid. This is due to the droplets having a higher viscosity than the solvent (water), leading to ability to flow much more easily.

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Condensation trails as viewed from another aircraft. (We were flying alongside for ~ 2 hours over the North Atlantic)

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When combined the tea molecules diffuse into the milk. The motion of molecules is not very closely packed. - Eva P.

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A video I took from 2019. Nothing special, but just a pleasant sight. Would the streamlines here be considered parabolic? What would a streakline look like for a water fountain?

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Ladle after stirring dumplings in hot water

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Ladle after stirring dumplings in hot water

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Shot in February 2021. Cold weather in Beijing makes the steam especially obvious and I posted an Instagram story about it.

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Was going down a steep slope when hiking in Malibu, almost fell down here😅

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This was shot last summer in the southmost part of China on a foggy morning. The clouds were pillar-shaped, and the fog blurred the bottom part of the mountains in the background.

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Went to Jiuquan Satellite Launch Center (Northwest China) to watch a rocket launch with my dad in 2020. Was very lucky to get this close-up view (3km from the rocket).

Ceres-1 is a small-scale carrier rocket developed by Beijing-based high-tech company Galactic Energy, and it is capable of sending micro-satellites into orbit.

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sorry - my fifth post of the day -

I made this "Squirrel fish" for our Chinese New Year dinner last week.

Squirrel Fish is a well-known dish in Southeast China. It is prepared by deboning and carving a fish into an ornamental shape similar to a squirrel, and then deep-frying it before dousing it in sweet and sour sauce.

Enjoy the view of boiling oil!

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I climbed up a sand dune over the weekend and I noticed that the sand would flow like a very viscous fluid whenever I broke the surface tension.

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Velocity vectors of a prototype foam dart in a 20 m/s simulated tunnel.

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In 2019, I attended a summer program at Rose-Hulman and studied vortex rings through working with vortex cannons. These cannons involve an empty chamber with a diaphragm on one end and a hole on the other end. When the elastic diaphragm is pulled back, the pressure in the chamber decreases as the volume increases. After the diaphragm is released, air is pushed out, with vortices curling around the lip of the hole, creating a vortex ring.

Unfortunately, a majority of the footage was lost (except for blurry photos), so I have uploaded a collaborator’s public video and slowed it down.

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I realized that I had just seen and used an example of a directing vane in Sea of Thieves. By directing the flow of water and using Newton's Third Law, our mighty galleon can make tight turns, enabling my crew's maritime wealth redistribution.

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Fire following a failed rocket static fire. Created a really cool looking blaze, but the flames in the bottom left corner especially caught my attention. I always love flame patterns that have this texture to them.

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Small vortices within dry ice form after carbon dioxide bubbles and the water vapor of a solution are exposed to the boundary point, where air touches the water solvent’s surface. Fog occurs when sufficient amounts of carbon dioxide are allowed to cool the surrounding air and water of the container, causing water vapor to condense and thus produce that eerie ambiance of a foggy night!

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Theatrical fog effects are created through the mixture of glycol and water, which is then passed through a heat exchanger in order to produce water vapor that we interpret as fog. To ensure that the fog maintains itself low to the ground rather than immediately rise, a low-lying fog machine will typically include a cooling unit where the fog will be chilled using a fan and then pass through a compressor, which serves to “compress” the gas, increasing the pressure of the fog by reducing the volume of the compressible fluid. As noted in the video above, judging by the fog’s relatively smooth flow along its path lines, this fog formation can be described to be in laminar flow.
Informational Source: http://news.bbc.co.uk/1/hi/magazine/8089678.stm

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I took this video during RPL’s static fire of our 8” diameter solid rocket motor, Earthshakiiiest, last week. Before testing *and exploding :((* our motor, we burned some extra propellant to test our igniter, which resulted in these pretty (but slightly terrifying) smoke clouds!

-Meghna Kiran

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Noticed this in a puddle on my way to class

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This is shot as a time lapse today from my window. Somewhere was on fire apparantly. The smoke formed a weird shape with a big head and a long tail.

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Cool laminar flow tik tok. Not my video but showed up on my For You page.

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I noticed this at the store. A boundary layer is clearly seen between the water and cyclopentasiloxane, the two main ingredients in this eye makeup remover. As I move the bottle, there are circular ripple-like deformations about the center. Looks super cool!

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I recently learned about Ruben’s Tube in one of my music technology classes. By drilling evenly spaced holes into a sealed tube, pumping flammable gas through the tube, and igniting the gas while playing pure tones on one end, one can visualize acoustic standing waves that change with frequency.

I would personally love to build and document this, but due to safety reasons, a video found online will suffice.

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25 seconds · Clipped by Yvonne Li · Original video "A better description of resonance" by Steve Mould

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A particularly windy day at the pond. There were a lot of birds, and they were trying to swim against the current, but could not overcome the force of the water. What was interesting is that there seemed to be a lot more birds than usual because the turbulence in the water brought more fish to the surface.

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A clip shot at Solitude Ski Resort, Utah. It was very windy, and snow was blown from mountain tops/trees causing "white-out" in some areas of the trails.

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I led worship at a Christian conference over spring break and this video shows the lights and hazers that were used on stage. I thought it was super mesmerizing!

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Being so close to a heat source seems to have created very visible convectional flows in this little pool of melted wax

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Fluid Dynamics Involved in a Stingray’s Swimming Behavior

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Fluid Dynamics Involved in a Stingray’s Swimming Behavior

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Due to a stingray’s flattened disk shape, stingrays must thrust themselves forward by propelling themselves with pectoral wings, that create a large series of leading edge vortices. Through the displacement of the surrounding water with this undulatory wing-like motion, the stingray is able to provide itself with a lift force that allows it to move through the water. It is interesting to note that depending on the wing shape of a particular species of stingray, a stingray may be classified as slow or fast-swimming, with fast swimming stingrays maintaining a higher Reynolds and Stroudhal number during the range of their oscillatory motion.

Reference Source: https://www.people.fas.harvard.edu/~glauder/reprints_unzipped/Borazjani.etal.2016.pdf

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Hydrodynamic Benefit of a Shark’s Dorsal Fins

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Hydrodynamic Benefit of a Shark’s Dorsal Fins

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Sharks are considered highly efficient swimmers (such as the dashing white-spotted bamboo shark shown above), due in large part to their dorsal fins which contribute to thrust vectoring and provide added momentum to the fluids displaced in their swimming motion. Although we may initially presume that these dorsal fins are static stabilizing appendages, they are in fact highly maneuverable and assist in propulsion while the shark is involved in steady swimming. This physical adaptation is akin to a surfboard fin, with a dorsal fin’s size and shape among shark species affecting the vorticity, drag, and velocity of the shark’s swimming behavior.

Reference Source: https://journals.biologists.com/jeb/article/220/21/3967/33732/Hydrodynamic-function-of-dorsal-fins-in-spiny

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The steam coming off my ramen was super noticeable because the sun was shining in from the window behind it.

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Happened while driving through a mountain pass in Utah (in summer tires :")). Aside from Star Wars warp drive, it reminded me of a uniform flow + vortex, with the flow parting around the car and creating a "safe" channel for a bit behind us. Another car behind us chose to drive in this safe zone, which honestly was a great strategy.

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Sand flows down the Kelso Dunes. There's a sort of rippling effect on the surface as the sand travels down, reminiscent of water. These dunes are also called the singing dunes, where the falling sands vibrations caused a low hum/buzz sound to emit from the dune. We were able to get it to sing because of the amount of sand we turned up while climbing up the dune.

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A slow motion clip recently recorded of milk being mixed into a drink. Over the next minute or so, it slowly dispersed throughout the whole drink. Looked pretty cool.

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High-speed clouds (best to mute) where the fringes evaporate in real time. BUT, would water vapor be unsteady and compressible as a cloud? In terms of fluid dynamics, how does a cloud form and maintain shape (especially in *turbulent* conditions)?

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my first time to look at eggs from a slow-mo perspective. Unlike normal liquids, eggs don't really spill over even if you stirr real hard.

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First thoughts were: "Those are F-35s.  All prior flyovers were models older than me.  There are tensions in Europe. Oh no."

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High speed footage I took of a rocket nosecone ejection test for RPL. The high speed camera is able to capture the CO2 escaping the system as it ejects.

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A bilge pump's expulsion of excess water from a boat is shown below. Bilge pumps are essential for the prevention of a boat from sinking through the removal of excess water by expelling water that accumulates along the bilge wells of a boat. Different types of bilge pumps include diaphragm and centrifugal bilges, with centrifugal pumps using a spinning impeller that uses rotational energy to discharge water, while a diaphragm bilge pump creates a vacuum of air, forcing water out through an inlet check valve whenever the diaphragm is pulled upwards. Ahoy there, bilge pump!

Source: https://www.carverpump.com/marine-bilge-pumps-the-ultimate-guide-for-ships/

https://www.carverpump.com/marine-bilge-pumps-the-ultimate-guide-for-ships/

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Large ocean waves (and a surfer!) at Pipeline beach in Hawaii this past winter! Hawaii's North Shore is known to have large waves, reaching about 20 ft or more, during the wintertime.

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Steam coming from an unknown source on a cold, windy day in New York. The formation and interaction of the turbulent eddies with the wind are visible here!

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Local waterfall in LA! A couple weeks ago when it was raining this caught me by surprise. It is cool to see the dispersion of water as it free falls through the air, contrary to free stream flow. Is there a classification for this type of fluid motion? Additionally, the water on the windshield briefly shows non-straight path lines as it rolls down the glass.

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I usually boil water in the mornings and this always happens. As I tilt the pitcher, the water touches the sides and briefly boils. Because the sides are hot, there is a thermal boundary layer as the water passes over the "wall". Conveniently, this thermal boundary exceeds the boiling point of water, making the heat transfer visible. Interesting to see the water "jump up" as the steam bubbles form.

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Very fine sand sometimes behaves like a fluid as shown in previous posts. I am unsure how fine the sand was here, but the mixing of the two show distinct stream lines around solid bodies. This was at Corona Del Mar Beach.

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This past summer, my family and I were in the Big Island of Hawaii and wanted to see the sunset from a high point on Mauna Kea, a dormant volcano. It was a hot, sunny day when we started out our drive from near sea level closer to the coast, but as we traveled higher in altitude, it became suddenly and noticeably colder - hence, thick and beautiful fog.

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I took this video over spring break at the Cliffs of Moher in Ireland. The wind was very strong when you walked to the top of the cliffs, and the waves were very large. It was overall a very beautiful sight!
Post made by Emily Duijser

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I took this video in Manhattan Beach when I was walking along The Strand. The waves were fast and there were lots of them.
By: Emily Duijser

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Sea turtles such as the dapper fellow shown above, have dorsal ridges along their back, which with its indentations can help reduce drag and negative lift when the turtle displaces the water around it with its circular swimming motion. The idea that sea turtles are well adapted to their aquatic environment, however, is nothing to be too shell-shocked about!
Informational Source: https://www.nature.com/articles/srep34283

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Video of USCRPL's launch this past weekend for recovery and avionics test vehicle Jawbone.
Apogee: 41,300 ft
Max Mach: 1.717
Peak Acceleration: 7.266 Gs

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When flying home from LA to Oklahoma for Easter weekend, I looked out the window and saw that we were flying through a cloud and remembered our conversation in class the other day about fluid particles in clouds.

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Might be hard to see in the video but there was noticeable turbulence behind this garbage bin. The runoff from the torrential rain started carrying it all the way down the road.

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I wanted to share a video of my friends and I “flyboarding” at the San Diego Harbor. The way this works is a rider is strapped into a board with jets on the feet, which is then connected by a long hose to the jetski. Water is then forced from the jetski to the jets on my feet, which then propels me up and out of the water. The pressure of the water is controlled by the driver who can vary the thrust by idling the jetski. In the video it can observed how turbulent the water is and the immense amount of pressure it comes out with. This was extremely fun and I highly recommend it!

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I recorded this video of my siblings going through a slot canyon river trail called “The Narrows” located in Zion National Park, Utah. You can hike up this trail for miles and miles covering a variety of water velocities, depths, and temperatures. The river is formed from water moving from higher elevation to lower elevation. In the video, the water was slightly turbulent, making it a challenge for us to cut across. Throughout this trail, the velocity of the water will change depending on how narrow/wide the river path gets, same way water velocity in a hose changes with a narrower nozzle. If you’re ever in Zion National Park, this is a must do!

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Here is something beautiful.

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Some with laminar, turbuelent, and toilet

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Some with laminar, turbuelent, and toilet

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An explaination image is attached at the end of the video.

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This is the rear wing of a nascar. Aero components on racecars are used to create downforce that leads to the car having more grip. This is a unique wing because nascars race on oval tracks so their wing is more of a right angle shape instead of being symmetric - Anna Lewis

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This is a video of smoke generated from welding usc racing frame. I really like this video in particular because both ends of the tube were mostly capped off so the smoke could only escape through a small opening here. The interference created some really beautiful movement visible in the smoke. - Anna Lewis

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5% speed RPL Jawbone launch showing thrust development in the nozzle for a compressible flow.

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This video was taken at the Saudi Arabia GP in Jeddah last season. It's pretty impressive to see how fast the cars can go (they can reach up to 360 Kph).

F1 cars also have a drag coefficient of about 0.7-1.0, which is actually larger than some cars like the BMW X5 which has a drag coefficient of 0.36. This is because the rear wing of an F1 car is designed to generate downforce which in turn causes a lot of turbulence.

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Found this picture in my camera roll from winter break and thought it was super pretty!

I looked up types of clouds and I believe these ones are technically classified as "cirrocumulus clouds", which are a type of "high-level clouds".

According to weather.gov, "High-level clouds occur above about 20,000 feet and are given the prefix "cirro-". Due to cold tropospheric temperatures at these levels, the clouds primarily are composed of ice crystals,  and often appear thin, streaky, and white."

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This is the AeroDesign Team's plane being flown at the Design, Build, Fly competition in Wichita, Kansas!

You might be able to catch a glimpse of the airfoil and the control surfaces as the plane is turning and see how the rudder and ailerons are used to turn the plane.

More generally, aircraft are a good example of fluid dynamics in real life. For example, lift is generated due to a pressure difference between the top of the wing (air speeds up, static pressure decreases) and the bottom of the wing (greater static pressure than the top).

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I shot a time lapse of the famous scene in Osaka during my trip in Japan. Enjoy the moving clouds and waves!

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Snowboarders love "powder", which is puffy fresh snow. When you fall, it doesn't hurt that much. What's interesting about powder is that, when you gain enough speed, you can float on this puffy snow, but when you slow down, you sink into it easily and it takes you a lot of effort to get out again.

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crystal like wave during boat trip to Catalina

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crystal like wave during boat trip to Catalina

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I realized I recorded a lot of fluid motions in my life. Here's another one during my boat trip to Catalina. The wave closest to us appears crystal-like in slow-mo.

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At the summit of the active volcano Kilauea in Hawaii, there are points at which hot water vapor can be observed rising from the ground. Rocks underground become incredibly hot, as they are heated by magma from deep underground, and groundwater that seeps below the surface is heated by these rocks and rises up again as water vapor!

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I was standing around a campfire and noticed some cool behavior exhibited by the smoke from the fire. The smoke appears to wrap around the edges of the log as it travels upwards, demonstrating a sort of laminar behavior immediately around the log before becoming turbulent further from the log (this is initially true for the flows on the left and right of the log, but the flow to the right becomes turbulent due to wind towards the end of the video).

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A 317 ft waterfall on the Merced River just downstream of Nevada Falls in Yosemite.
Post by: Amanda Akrawi

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This past weekend, RPL launched a 6” vehicle called Jawbone. The smoke at ignition was an incredible sight!

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I thought I would add my waves from Hawaii. I was on Oahu on the south shore.

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A video of the streams off of F-18 fighters at my brothers graduation last year. Volume is necessary- Sean Janka

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A car on fire on the 110 last year, you can see the smoke rising from the vehicle it is hard to decipher the intricacies of the black smoke with the low quality video.-Sean Janka

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I didn’t take this video, but it is an example of the perfect waves in Indonesia.-Sean Janka

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This video of Old Faithful was taken during a family road trip at Yellowstone last summer.

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This video of the Rainbow Pool was taken during a family road trip at Yellowstone last summer.

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Prime view of the braking zone in a key overtaking part of the track. The high downforce of the cars limit drafting at close distances so overtaking is difficult.

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A Life fire exercise on a Navy War Ship is by far the most amazing experience. Her you can see the rapid pressure changes from the ejecting 5 inch gun and the shell that gets ejected afterwards. This video was taken in 2013 on a U.S. Navy Arleigh Burke Class Destroyer DDG 51 where I was stationed. You can see a lot of fluid dynamics happening during the firing of the weapon.

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The Navy Destroyer life fire exercise is quiet fun when you see some of the gadgets on display. The pressure changes taking place during the ejection process causing vibrations. The shell ejection at the end is an added bonus. Lots of Fluid dynamics on display. This was taken in 2013 on DDG 68, an Arleigh Burke class Navy Destroyer where I was stationed.

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A fun-filled display of fluid dynamics taken in 2016 at the Dubai Fountain. The path-lines and stream-lines followed by these jets is just amazing to watch. Taken from about 100 ft away.

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Water running along the side of an airplane

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Water running along the side of an airplane

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As I was flying over spring break, I noticed these cool paths the water was taking along the side of the airplane in the air. It was fun to see fluid dynamics in acition!

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A Ferry generating water wakes as its passing under Queensboro bridge in New York City

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A Ferry generating water wakes as its passing under Queensboro bridge in New York City

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I found a couple of videos from back when I used to commute between NYC boroughs using the Ferry boat. The wakes behind the ferry have always been impressive.
By Fatima Karami.

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Here is a video from a few years ago. I was caught in a hail storm back in Colorado. It was so bad I had to pull over and wait for the hail to lessen before I could drive again. Cool to see the water falling off my wipers. Less cool to see the hail damage taking place.