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DolfynNet
Registrace 11. 02. 2010
Video
Turbulente kinetische energie (secties)
zhlédnutí 129Před 3 lety
Turbulente kinetische energie (secties)
roesner 04 re 1131 5 0 cyl
zhlédnutí 68Před 7 lety
Roesner Spin down (cilinder) Reynolds = 1131, alpha = 5 Darmstadt
briley re 0215 0 5 spinup
zhlédnutí 44Před 7 lety
WR Brliey & HA Walls Spin up Reynolds = 215, alpha = 0.5 Freising/Weihenstephan 1986
briley re 1167 2 0 spin down
zhlédnutí 66Před 7 lety
WR Brliey & HA Walls Spin down Reynolds = 1167, alpha = 2.0 Freising/Weihenstephan 1986
Hong Kong International Airport / Tung Chung / Tuen Mun
zhlédnutí 436Před 8 lety
Hong Kong International Airport / Tung Chung / Tuen Mun
Okanagan Lake, Westside Road, Vernon, British Columbia, Canada
zhlédnutí 367Před 9 lety
Okanagan Lake, Westside Road, Vernon, British Columbia, Canada
Driving from Osoyoos to Keremeos, Okanagan, British Columbia, Canada
zhlédnutí 749Před 9 lety
Driving from Osoyoos to Keremeos, Okanagan, British Columbia, Canada
Von Karman vortex street (turbulent, velocity magnitude), Re = 20,000
zhlédnutí 1KPřed 14 lety
Von Karman vortex street (turbulent, velocity magnitude), Re = 20,000
Von Karman vortex street (turbulent, temperature), Re = 20,000
zhlédnutí 4,9KPřed 14 lety
Von Karman vortex street (turbulent, temperature), Re = 20,000
Von Karman vortex street (turbulent, velocity vectors), Re = 20,000
zhlédnutí 3,4KPřed 14 lety
Von Karman vortex street (turbulent, velocity vectors), Re = 20,000
Von Karman vortex street (turbulent, vorticity), Re = 20,000
zhlédnutí 661Před 14 lety
Von Karman vortex street (turbulent, vorticity), Re = 20,000
Hi there, I was wondering if I could use some stills of the fluid as inspiration for an album cover I am designing. Would love to hear from you!
Thank you for your interest and request. Of course, you can. Please email to info at cyclone dot nl
Thank you for your quick response, I have sent you an email!
Our Luminaries Processions Then 🤦🤦
I wonder what the stall characteristics were...
🙂🍀🍀🍀⏳
🙂🍀🍀🍀
Why is he like a oscillating spring?
don’t know why i’m watching this but i’m glad i did
Some segments in the video are stamped not adjacent to each other
Amogus lol
Sus
This phenomenon caused the death of Djatlov group in 1959...
This for no good reason caused me immense feelings of unease and terror. It really cool don't get me wrong, but jeez that was intense
These beautiful mysteries of the universe and the human understanding of it makes our times worth living....
Hi, Do you think it is possible to see in more detail one f created vortexes?
Hello there! Could I maybe use your ''Tunnel boom in Japan'' video for my video with 5 facts related to vehicles? If yes, I will of course credit your video in the description. Have a nice day ( :
Interesting!
Hello! Could you do the similar work as in this video? How i can contact you?
Maybe you can do it yourself? Email: info at cyclone.nl
Will you be able to see the vortex street when the mesh is coarse? How fine should the mesh be?
A mesh can only resolve features larger than the individual cell sizes - the smallest eddies you expect to, or want to, capture dictate the fineness of the mesh. In 2D think of at least 4 (2x2, very coarse), 9 (3x3, bit better), or 16 cells (4x4) for the smallest eddy you want to resolve.
@@DolfynNet Thank you for your answer sir. But I still wonder, how can I know the size of the eddy? Is there a "threshold" size for the karmen vortex to happen?
what does the pseudocolor band represent and in which unit?!
In the legend you will find the hint temperature and Kelvin - it is meant as a tracer
DolfynNet Thanks for your reply.
Look like microwaves in waveguide
Hello, thanks for this impressive movie. I need more information about the film as I do a scientific work. Can you help me quickly and contact me?
Aero 4B anybody ?
If you could make experiments for Tesla's turbine, that would be great! People want to see how Tesla's turbine works.
I told you not to post my spermcell clip Rita
can this apply to how our earth's trailing magnetic field recouples?
Thank for the video I don't use the same software Can you remember the caracteristics you used? (cylinder size, fluid, fluid speed)
Hey, I'm aslo intresseted about this
This is FASCINATING!
This such kind of experiment solved Russian most mysterious death case
It didn't solve the mystery, this was just a hypothesized theory.
Adam Perez Exactly. Nothing was solved!
think my volume might be broken
I want this as my Screensaver
What are the colors representing?
The title and legend mention temperature - it is a heated cylinder
DolfynNet haha I did not pay attention to the title and I simply could not read the colorful bar :) Is this a free software?
Yes all codes used (GMSH, dolfyn, and VisIt) are free software. On www.dolfyn.net it shows you how it has been done.
DolfynNet What is the advantage of this to openfoam?
Be my guest to find out yourselves and if you like it, use it, if you don't, well... don't use it. It is easy to understand (40k lines of code in total) and people who never compiled any source code (on Windows) are able to do so, and actually do.
Why am i watching this when i live in Keremeos lol
Hey man...whats it like in Keremeos? Where do people work? Nice place to live?
@@danielleclair1360 they work on farms or fruit stands or the gas station downtown or every single building in the middle of town especially the big store. its a pretty place to live but the internet is trash.
@@Justinhulk Okay...I want to relocate to BC. Okanagan up to the Shuswap and the mainstays in the Kootenays have me interested. I like Van but the big expensive city isnt my thing. Looking for beauty, slow pace but need work. Any suggestions?
@@danielleclair1360 all i know is kelowna and oliver are beautiful
Codes used: Gmsh (meshing), dolfyn (simulation), and VisIt (visualisation), none of them are by Ansys, all of them are free and open-source.
Can you share the code on github?? that would be awesome
Could placing cylindrical structures in a spiral pattern build up the vortices of one chirality enough to create a twister?
Fantastic
ANSYS ?
What is this program
Great video. And what program is this?
Great video. And what program is this?
beautiful
Hi!! I have done this problem in my computer, but I don´t know how to do this video, Could you help me please??
+Industrial Engineer That depends on your postprocessing software. Create many pictures (25 per second) and import them into a "movie builder" (for example "OpenShot" on Linux/Ubuntu).
Hello, thanks for sharing your simulations in youtube :) I am a total newbie in this field, and was trying to simulate air flow over different objects. I have been using Comsol, and would like to ask you a few things... 1. Are you using a laminar or a turbulent model for these kind of simulations? 2. I started out with a laminar model, but the simulations had been yielding different velocity field patterns, with every run. I thought the 'system might be unstable' at these values, so switched over to a k-epsilon turbulent model. Am i thinking in the right track? Thanks, any suggestion would be invaluable!
what is dimension of a inlet,outlet, top n bottom
Is the Reynolds number simulated as 20000 ? It seems as Re < 200 ?
+Tobias Holzmann Sorry you are wrong here. Look up for example the Strouhal versus Reynolds number plots available in literature and you will find also turbulent vortex shedding. Note the difference with laminar shedding at Re = 250. Not convinced? Turbulent vortex shedding in the turbulent atmosphere behind an island: earthobservatory.nasa.gov/IOTD/view.php?id=2613
@@DolfynNet Turbulence is three-dimensional. You are constraining your flow to two dimensions and it is unstable in the third dimension.
so fucking beautiful!
赵南一 Thanks :-)
Hi, I wonder what settings do you use to generate the mesh on Gmsh?
You will find your answer on the dolfyn website :- )
This is the dance of the universe
the world is naturally beautiful, whether we can see it or not. :)
Trust me, this isn’t a “naturally beautiful” thing when you’re caught up in it.
I think I'd rather see the beautiful phenomenon, thanks
really nice video. Did you use Multiphysics autodesk to simulate it?
did you use water or air as the fluid?
nop it's just the vector size that is too big
Simple outlet. Details can be found at: dolfyn.net (look for the 8th Gmsh tutorial: von Karman vortex street)
Nice work! Can you tell me please wich BC did you use for the exit plane?