Tighten the Towel! Simulating Liquid-Fabric Interactions

Tighten the Towel! Simulating Liquid-Fabric Interactions


Dear Fellow Scholars, this is Two Minute Papers
with Károly Zsolnai-Fehér. Today, I’ve got some fluids for you! Most hobby projects with fluid simulations
involve the simulation of a piece of sloshing liquid in a virtual container. However, if you have a more elaborate project
at hand, the story is not so so simple anymore. This new paper elevates the quality and realism
of these simulations through using mixture theory. Now, what is there to be mixed, you ask? Well, what mixture theory does for us is that
it helps simulating how liquids interact with fabrics, including splashing, wringing, and
more. These simulations have to take into account
that the fabrics may absorb some of the liquids poured onto them and get saturated, how diffusion
transports this liquid to nearby yarn strands, or, what you see here is a simulation with
porous plastic, where water flows off of, and also through this material as well. Here you see how it can simulate honey dripping
down on a piece of cloth. This is a real good one – if you are a parent
with small children, you probably have lots of experience with this situation and can
assess the quality of this simulation really well. The visual fidelity of these simulations is
truly second to none. I love it. Now, the question naturally arises – how do
we know if these simulations are close to what would happen in reality? We don’t just make a simulation and accept
it as true to life if it looks good, right? Well, of course not, the paper also contains
comparisons against real world laboratory setups to ensure the validity of these results,
so make sure to have a look at it in the video description. And if you’ve been watching this series
for a while, you notice that I always recommend that you check out the papers yourself. And even though it is true that these are
technical write-ups that are meant to communicate results between experts, it is beneficial
for everyone to also read at least a small part of it. If you do, you’ll not only see beautiful
craftsmanship, but you’ll also learn how to make a statement and how to prove the validity
of this statement. This is a skill that is necessary to find
truth. So, please, read your papers. Thanks for watching and for your generous
support, and I’ll see you next time!

100 Replies to “Tighten the Towel! Simulating Liquid-Fabric Interactions”

  1. Tighten the Towel! We are now available on Instagram with short snippets of our new episodes. Check us out there! https://www.instagram.com/twominutepapers/

  2. What is this Two Minute Papers telling me to read the papers instead of holding onto them.. do you feel okay?

  3. I really like your videos, thanks. You present technological progression with enough clarity and calm so that I do not get confused or scared of it.

  4. I want you to know that I absolutely love your videos. It makes me happy to hear you speak about this stuff, I can hear in your voice how much you love it. I hope you are happy, inside and out =)

  5. I like how in all these simulations animated parts look kinda robotic, in contrast to the physics they interact with, which looks very natural and random

  6. The simulation in the video with the "Tighten the Towel" tray looks great on the wrung towel, but terrible where the water droplets hit the water in the tray (it suddenly acts more like a gel, leaving stiff peaks that slowly ooze down).

  7. Maybe it would help to give cloths more wet states, that interact differently with fluid? Like damp, wet, soaked (reflective)

  8. Can these simulators describe the formation of a single stable droplet whose profile agrees with the Laplace-Young equation?

    I doubt it very much! It is a very difficult test!…..

  9. So.. Let me get this right… We are simulating physics in an extremely realistic fashion, using an incomplete knowledge of actual physics? OK, then if we are living in a simulation (and it's highly probable that we are) then did the creators of this simulation use an incomplete knowledge of their own physics to create ours? And if the answer is yes, and we are billions of simulations deep, just how complex can physics actually be?

  10. Honestly, this may be impressive in terms of progress, but not yet impressive on the scale of absolute accuracy. Turning 360 degrees will hardly make a towel any more dry than just hanging it normally. And comparing the dead easy scenario of dripping a liquid on a flat stationary cloth is equally unimpressive, it doesn't even look like the real result because we can see the liquid forming surface tension pools on the cloth for the simulation, which it doesn't in the real experiment. Yes I know it's not actually surface tension it's probably just the smallest particle size of the simulation, but again, it's not impressive on an absolute scale, and on this scale we don't care how the simulation is done, we only care if it looks like real life.

  11. Dont know about honey but my daughter likes to watch maple syrup pouring down on her french toast. She could judge better.

  12. The honey looks incredible, but the towel looks like it drips a little too much when flattened. Maybe it is too absorbent, or the strength of the bond should vary dependent on how saturated the fabric is. For example, if the towel is only 5% saturated the towel is very strongly absorbent, and bonds strongly to the water, but at 85% saturation the excess water blocks how quickly further absorption can occur, and the bonding is weaker. They might already do this, but I can't access the paper. The water also (oddly) looks like it is far too viscous in the pan, but not viscous on the towel?

  13. Interesting. The comparison experiment-simulation seems to show the simulation as taking the assumed texture of the cloth as being uniform, when if you look at the experiment, the drip seems to take a not-so-symmetrical distribution.

  14. Will the ps5 be able to handle these new simulations in games? fingers crossed…why am I holding my breath? I always get hyped for the next new system to be disappointed… Mark Cerny?? what cards are you hiding?

  15. The dripping water doesn't look proportionally realistic.
    Also the ball of water looks to be the size of a fist. But upon impact, it demonstrates the physical properties of a huge amount of water.

  16. Thanks for the bit at the end about reading your papers 🙂 I will give it a try – maybe you could do a video that helps illuminate further how logic and proof find their way into development and testing? thanks as always!

  17. Science is about making hypotheses (or statements) and disproving them, not proving them. And only when all attempts to disprove it fail, can it be said it might be true.
    It's a subtle difference, but it's what eliminates confirmation bias from science.

  18. Thanks a lot!
    I work in laundry industry for 10 years, finished my education in cleaning and service university, – and you would be surprised how much do mechanics of linen are studied in process of washing.
    I hope some day we could use this study to simulate full washing process with different types of linen.

  19. 1:18 Tho I’ve no children, I’ve enough experience with honey to really appreciate how frelling amazing the puddling honey is…

  20. Nem gondoltam volna h ilyen helyen, ilyen témában lehet magyart találni 😀 furcsálltam h egyszerűen értem az angolt, aztán esett le h aZsolnay-Fehér Károly igencsak magyaros xd

  21. I'm sorry but the post-rung towel was literally pouring like a thunderstorm, no towel is capable of holding that much liquid. And the ringing was only one twist, which we know isn't going to actually ring anything out. The animations are truly unbelievable, they look so much like real life in terms of the fluid dynamics, but I think whatever initial values they gave the towel were screwed up.

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