learnfluidmechanics
learnfluidmechanics
  • Видео 82
  • Просмотров 888 769
Physics-informed Statistical Learning for Model Comparison and Uncertainty Quantification
Physical modelling meets Machine Learning (in this case Gaussian Processes) in Thermoacoustics. This physics-informed statistical learning framework balances the robustness and interpretability of reduced-order models against the expressive and predictive capabilities of machine learning.
Просмотров: 859

Видео

Adjoint-based shape optimization of a laboratory combustor, changing areas only
Просмотров 8124 года назад
The top figure shows a 3D rendering of a laboratory combustor. Air enters on the left into a plenum. Air then flows through a narrow feed tube into a combustion chamber on the right. A flame sits at the left end of the combustion chamber. The bottom figure shows the acoustic natural frequencies (eigenmodes) of this system. These are calculated with an acoustic network model. Frequency is on the...
Adjoint-based shape optimization of an annular combustion chamber in a simplified gas turbine engine
Просмотров 8544 года назад
The top-right figure shows a 3D rendering of a simplified model of an annular combustion chamber in an aircraft gas turbine engine. The bottom-right shows a slice through the combustion chamber, showing the plenum on the left, the feed tubes in the middle, and the combustion chamber on the right. The figure on the left shows the acoustic natural frequencies (eigenmodes) of this system, calculat...
Thermoacoustic oscillations from a camping gas flame
Просмотров 2,4 тыс.4 года назад
An empty tube is placed over a camping gas flame, setting up thermo-acoustic oscillations in the tube.
Adjoint-based shape optimization applied to an inkjet print head.
Просмотров 1,8 тыс.4 года назад
A drop-on-demand inkjet printhead is a narrow channel containing a piezo-electric actuator and a small orifice. Ink is pumped continuously through the channel. When the actuator pulses, it pushes a droplet out of the orifice. After each pulse, acoustic reverberations remain in the channel until they decay due to viscous and thermal dissipation, or propagate out of the channel. If the next dropl...
adjoint-based optimization
Просмотров 27 тыс.4 года назад
A description of adjoint-based optimization applied to Fluid Mechanics, using the flow over an airfoil as an example
Aside: Boundary Layer Separation
Просмотров 72 тыс.9 лет назад
This clip explains why boundary layers separate and compares boundary layers with the Couette and Poiseuille flow studied in chapter 3. It then explains some of the consequences for flow around wings and other objects.
Aside: Boundary Layers
Просмотров 4,4 тыс.9 лет назад
Whenever a solid moves through a fluid, boundary layers form along the edge of the solid. This clip explains the velocity profile in these boundary layers.
Worked example: flow reversal between flat plates
Просмотров 3,1 тыс.9 лет назад
This worked example examies combined Couette/Poiseuille flow and calculates the pressure gradient at which the flow will reverse.
Aside: Laminar viscous flow between flat plates
Просмотров 12 тыс.9 лет назад
When a fluid is laminar (i.e. sheets of fluid slide over each other) and is confined between flat plates, some properties (such as velocity and shear stress) only vary in one direction while other properties (such as pressure) only vary in the perpendicular direction. This means that the partial derivatives collapse to ordinary derivatives and the velocity profiles can be found by hand. This cl...
Viscosity and irreversibility
Просмотров 1,7 тыс.9 лет назад
Viscosity and irreversibility
Aside: Random collisions, momentum transfer and viscosity
Просмотров 7 тыс.9 лет назад
By jostling around randomly, the molecules in a fluid transfer momentum from one part of the fluid to another. In a continuum model, the ability of a fluid to transfer momentum is measured by the viscosity. This clip explains the link between viscosity and molecular motion.
Aside: Applying Bernoulli across streamlines (physical)
Просмотров 2,5 тыс.9 лет назад
Aside: Applying Bernoulli across streamlines (physical)
Aside: Applying Bernoulli across streamlines (mathematical)
Просмотров 2,6 тыс.9 лет назад
Aside: Applying Bernoulli across streamlines (mathematical)
Aside: Including gravity in Euler's equation
Просмотров 2,5 тыс.9 лет назад
Aside: Including gravity in Euler's equation
Worked example: point source in 2D
Просмотров 1,2 тыс.9 лет назад
Worked example: point source in 2D
Worked example: flow over a river bed
Просмотров 1,5 тыс.9 лет назад
Worked example: flow over a river bed
Aside: Euler's equation
Просмотров 3,7 тыс.9 лет назад
Aside: Euler's equation
Aside: The material derivative
Просмотров 12 тыс.9 лет назад
Aside: The material derivative
Aside: Equations of State
Просмотров 4,4 тыс.9 лет назад
Aside: Equations of State
Aside: The Del operator
Просмотров 23 тыс.9 лет назад
Aside: The Del operator
Aside: Ordinary vs. partial derivatives
Просмотров 4,7 тыс.9 лет назад
Aside: Ordinary vs. partial derivatives
Aside: Particles vs fields
Просмотров 9 тыс.9 лет назад
Aside: Particles vs fields
9.5 to 9.7 Examples of dimensional analysis
Просмотров 2 тыс.9 лет назад
9.5 to 9.7 Examples of dimensional analysis
9.3 The engineer's approach to dimensional analysis
Просмотров 1,9 тыс.9 лет назад
9.3 The engineer's approach to dimensional analysis
9.2 The mathematician's approach to dimensional analysis
Просмотров 1,7 тыс.9 лет назад
9.2 The mathematician's approach to dimensional analysis
9.1 The philospher's approach to dimensional analysis
Просмотров 1,9 тыс.9 лет назад
9.1 The philospher's approach to dimensional analysis
8.9 Relevance of inviscid flow
Просмотров 8 тыс.9 лет назад
8.9 Relevance of inviscid flow
8.8 Flow instability and vortex shedding
Просмотров 9 тыс.9 лет назад
8.8 Flow instability and vortex shedding
8.6 Drag reduction - streamlining
Просмотров 3,6 тыс.9 лет назад
8.6 Drag reduction - streamlining

Комментарии

  • @gautambaranwal445
    @gautambaranwal445 10 часов назад

    Thanks..

  • @Iskandar_manangin
    @Iskandar_manangin 8 дней назад

    how to find v1 ?

  • @henryford2785
    @henryford2785 Месяц назад

    excellent video! Thank you!

  • @cleisonarmandomanriqueagui7502
    @cleisonarmandomanriqueagui7502 Месяц назад

    Amazing , the top level of understanding . intuition

  • @aerodynamico6427
    @aerodynamico6427 2 месяца назад

    He says corrects himself four times: at 11:58, 13:23, 13:55, and 14:12 (confused between back of the wing and tip) and says "I'm sorry" thrice after mixing up stagnation and separation. He's drunk!

  • @Dragonson575
    @Dragonson575 4 месяца назад

    At 2:02 you mentioned that tau only varies in the y direction, yet you wrote that d(tau)/d(y) is equal to zero. Isn't that contradictory?

  • @engineer.paulmusyoka
    @engineer.paulmusyoka 4 месяца назад

    If y=H then...

  • @comment8767
    @comment8767 4 месяца назад

    We don't have any punts in the US.

  • @samr2263
    @samr2263 4 месяца назад

    4:42 so the convective part is independant of time, is that correct ? Is it as if it was "moving" accross space at a certain point in time kept constant ?

  • @zhenccc
    @zhenccc 6 месяцев назад

    this is explained so clearly!

  • @pragyabrattripathi6278
    @pragyabrattripathi6278 8 месяцев назад

    Great Sir...

  • @sam19022004
    @sam19022004 9 месяцев назад

    Only great explain of fluid mechanics I can find in the internet

  • @goodgood_study
    @goodgood_study 11 месяцев назад

    i'm writing the report for 3A1!! Really thanks for your help!

  • @gate2024-c5b
    @gate2024-c5b 11 месяцев назад

    2:46 here you mean there is no pressure gradient along x direction ? or you mistakenly written partial wrt y as pratial wrt x

  • @aflofo
    @aflofo 11 месяцев назад

    This is probably the most comprehensive explanation of how adjoint optimizations work. Everyone else wants to jump right into the math without giving a good intuitive understanding about what is going on first.

  • @lonewolfgaming5245
    @lonewolfgaming5245 Год назад

    Thanks for the explanation. But can you tell what does it mean physically when the flow is irrotational that we are able to apply Bernoullis eqn accross stream lines. Also why is stagnation pressure uniform? Does it mean the static pressure component will adjust itself with velocity variations along the flow?

  • @r2k314
    @r2k314 Год назад

    I can tell from your elegant explanations that you have a deep understanding of fluid dynamics. Excuse my stupid question, but I am trying to develop an intuition for the subject. I don't understand how V1 an equal V3 if there is a static pressure loss? Thank you.

    • @r2k314
      @r2k314 Год назад

      I'm sorry I mean stagnation pressure drop.

  • @r2k314
    @r2k314 Год назад

    where does the force comes in if momentum is conserved between layers?

  • @avyakth7995
    @avyakth7995 Год назад

    0:48 why you used volume instead of area

  • @avyakth7995
    @avyakth7995 Год назад

    sir ,could you please suggest reference book for this derivation

  • @akinyilmaz99
    @akinyilmaz99 Год назад

    Thanks for simple explanations.

  • @Azch20
    @Azch20 Год назад

    How to study the accuracy and uncertainty of this Vortex speeding meter

  • @ObeyRoastMan
    @ObeyRoastMan Год назад

    What types of fluid is this valid for? Liquids sure, but gasses?

  • @AJ-kv4ui
    @AJ-kv4ui Год назад

    great explanation!

  • @alimozaffar6884
    @alimozaffar6884 Год назад

    how a good lecture!! thanks alot

  • @cvspvr
    @cvspvr Год назад

    why do we use the reynold's number? it seems like an arbitrary simplification that should be the result of the calculations rather than be used by the calculations

    • @davidaugustofc2574
      @davidaugustofc2574 Год назад

      Reynold's number is used to know if we can compare 2 simulations/validation tests. The lower the number the more dependent on viscosity the flow is. Since similar numbers have similar characteristics you can use much smaller scale models to check if the simulations are accurate (as long as the numbers are similar)

  • @mther123
    @mther123 Год назад

    Excellent video

  • @mther123
    @mther123 Год назад

    Excellent another video

  • @mther123
    @mther123 Год назад

    Excellent video

  • @yonnileung
    @yonnileung Год назад

    No more War!!!

  • @SelmanBaysal
    @SelmanBaysal 2 года назад

    Many thanks for the great videos explaining essential processes and concepts simply!

  • @qr-ec8vd
    @qr-ec8vd 2 года назад

    this is just analytical partial derivations, right?

  • @TheAFWWA
    @TheAFWWA 2 года назад

    The fact that the concept is explained so well within 4 mins is amazing. Thanks a lot for these videos

  • @diegoandrade3912
    @diegoandrade3912 2 года назад

    what a tremendous explanation!

  • @lightspd714
    @lightspd714 2 года назад

    Thanks for the helpful video. Just to clear up for the case where we apply Bernoulli along a streamline where you dot the equation with v. Would omega cross v be zero without dotting it with v? If so, then it seems the omega cross v term is always zero- which would seem to trivialize the condition of requiring zero vorticity. Thanks for the content!

    • @learnfluidmechanics4166
      @learnfluidmechanics4166 2 года назад

      No, omega cross v is, in general, not zero.

    • @lightspd714
      @lightspd714 2 года назад

      @@learnfluidmechanics4166 Thank you very much. I really appreciate this video. It is the only video to clear everything up regarding Bernoulli’s equation and use cases for me.

  • @MosesAndruart
    @MosesAndruart 2 года назад

    Excellent explanation. Rich in details, yet very brief. This is how every teacher should be. Thank you.

  • @paulopucca1323
    @paulopucca1323 2 года назад

    Dear Professor! Excellent video! Thank you.

  • @dheyaalgallaf6060
    @dheyaalgallaf6060 2 года назад

    Any similar explaination for gas's orifice?

  • @gregoryaldebert2993
    @gregoryaldebert2993 2 года назад

    I like your channel. Thank you very much !

  • @xyrildanmanuel783
    @xyrildanmanuel783 2 года назад

    9:33 "...coated in condensed milk.... of all things" some small and quick humor right there

  • @sechristen
    @sechristen 2 года назад

    I'm confused about why it's more efficient to solve for how the lyft/drag changes with respect to each flow variable. Are you solving a PDE for each flow variable? Or does it have something to do with how you evaluate the lift/drag from the flow variables? Thank you! Lovely explanation of concept.

  • @Arthanzar
    @Arthanzar 3 года назад

    Are you confusing height with altitude? They are completely different.

  • @alitabarzadi3137
    @alitabarzadi3137 3 года назад

    Thank you.

  • @HeavY808
    @HeavY808 3 года назад

    Thank you! Super useful video

  • @rafaeltannenberg7403
    @rafaeltannenberg7403 3 года назад

    Thanks for the very good explanation! Would it be possible to compute the derivatives directly for the lift/drag-ratio rather then doing it independently for the two quantities? I assume that would reduce the required computational effort further (by the cost of one foward function evaluation)?

  • @giuseppe654
    @giuseppe654 3 года назад

    you explain things ver well. In university, there is a lot of confusion between separation and turbolence

  • @Gorusuur
    @Gorusuur 3 года назад

    Great explanation

  • @HaoJingChangZai
    @HaoJingChangZai 3 года назад

    Thank you very much this is the best theoretical and engineering-practical explanation I've come across online.

  • @ShioChannel
    @ShioChannel 3 года назад

    May i know what is the name of the equation? and is there any book show the above equation?

  • @Rolandus42
    @Rolandus42 3 года назад

    Boring teaching/lecturing.