Aldo Ricci

外人

[Chris Combs (iterative design enjoyer) @DrChrisCombs]

Some thoughts on the Navier-Stokes news from a professor of aerospace engineering:
1) take a deep breath
2) posts indicating we "solved Navier-Stokes" are incorrect and overblown. A very specific mathematical proof involving a niche scenario for Navier-Stokes has *potentially* been shown (that a perfectly smooth incompressible initial condition with finite energy could produce a singularity--note the assumptions here piled on to an equation set that already involves some assumptions).
3) there is no general closed form solution for N-S and that's not what this news is about
4) this is more of a mathematical curiosity than anything else and could matter a lot to mathematicians but basically changes nothing in the way N-S are used in practice
5) there are already very useful exact solutions to Navier-Stokes that greatly simplify the equation set with the right boundary conditions/geometry like laminar flow through a pipe or a 2D Taylor-Green vortex
6) in aerospace, we already treat N-S as an approximation in many instances and are well aware of its limitations. we don't outright solve these equations anyway and regularly chop off terms or simplify parts (at the expense of accuracy) to make them easier to deal with.
7) to be honest I have never found this specific problem to be particularly interesting because we know a core assumption of N-S is a "continuum" fluid where you ignore molecules and assume hydrodynamic scales >>> molecular scales. We know a real fluid cannot have infinite velocity or energy. But clearly you can push equations outside of their bound of validity and make them produce funky results and singularities.

[Aldo Ricci @Cargo444]

@schiva_questa Mi ha sempre colpito l'intensità di questa vignetta. Trasuda rimpianti nostalgia e purtroppo illusioni. La deriva senza perdono. Ciao

[Giorgi Revishvili @revishvilig]

General Valerii Zaluzhnyi, former Commander-in-Chief of the Ukrainian Armed Forces and current Ambassador to the UK:

Due to scientific and technological progress, it has become impossible, regardless of what others may claim, to carry out operational-level tasks. 1/12

[Aldo Ricci @Cargo444]

@Afghan_Engineer Cosfi 0.9 so 450 kW

[Aldo Ricci @Cargo444]

@Sam_Axiom +-1

[Philosophy Of Physics @PhilosophyOfPhy]

Quantum Immortality is a mind-bending thought experiment based on the Many-Worlds Interpretation of quantum mechanics. It suggests that from your own subjective perspective, you can never experience your own non-existence.

You cannot "experience" the branch where you are dead. Therefore, your consciousness must always follow the branch where you survived.

[Aldo Ricci @Cargo444]

@miniapeur 200 N

[Aldo Ricci @Cargo444]

@TheTrueVanguard Your papers are in order....

[Dave Jones @eevblog]

IMPORTANT message for everyone using Gmail.
You have been automatically OPTED IN to allow Gmail to access all your private messages & attachments to train AI models.
You have to manually turn off Smart Features in the Setting menu in TWO locations.

Retweet so every is aware.

[Aldo Ricci @Cargo444]

@mediohoriente Sad but true

[Aldo Ricci @Cargo444]

@silvyiaaa Brisky

[CALL TO ACTIVISM @CalltoActivism]

Stephen Colbert just ended JD Vance’s political career:

“We heard that JD Vance loves a good-natured, funny meme, so we made one just for him!”

[Aldo Ricci @Cargo444]

@chriz31_07

[Claude Taylor @TrueFactsStated]

I’ve been tweeting these two videos for a couple days. How are they holding up? Thoughts?

[Iyke @currentiyke]

The red line probably indicates people sleeping with eachother.

[Shawn Harris for Congress @ShawnForGeorgia]

Marjorie Taylor Greene doesn’t want you to know her opponent’s name. That’s how desperate she is to keep her seat.

I’m Shawn Harris. I am a Democrat, husband, father, Retired Brigadier General, and farmer. I’m running against her. Share my name.

[Aldo Ricci @Cargo444]

@CrackerBarrel @grok what's all the fuss on crackerbarrel about?

[Aldo Ricci @Cargo444]

@Happyrising_guy

[Protect Kamala Harris ✊ @DisavowTrump20]

Capitol Police Officer Michael Fanone was tased on January 6th until he went into cardiac arrest and his heart stopped. Donald Trump pardoned his assaulters and called them “patriots.”

RETWEET if you stand with Officer Fanone against Trump and the GOP!

[Aldo Ricci @Cargo444]

@chriz31_07