Umm, rocket science is...rocket science?

Combustion CFD is a very difficult area. The problem is that there are so many interlinked phenomena all requiring special modeling methods that one really isn't quite certain of the accuracy of the result unless they can compare it to a physical model test, which is what is frequently done. Simply getting the correct boundary conditions can be very challenging. Failing to apply appropriate modeling and boundary situations leads to a garbage in/garbage out situation, but the numerical solution may look plausibly correct.

CFD is not use exclusively in design work except for very basic cases where the modeling accuracy is well understood. However, CFD for more complicated situations is still useful as it may illustrate behaviors and trends in performance in situations where physical observations are difficult (like in a rocket nozzle). The CFD results can be used to guide and interpret the results of physical testing.

Understanding CFD really requires PhDs who understand fluid dynamics as well as the limitations of the numerical models used. This is true in many industries, not just rocket surgery.

Ahem; that's "Matter of Color", thank you very much.

Chicken chicken, (chicken) chicken?

https://www.improbable.com/airchives/paperair/volume12/v12i5/chicken-12-5.pdf

https://xkcd.com/538/

If they can't afford enough computer to crack your passphrase, they can still afford a $5 wrench

The plan for SpaceX's Dragon 2 is also a soft powered landing.

https://www.youtube.com/watch?v=Cf_-g3UWQ04

The old model for music distribution:

1. A song gets played on the radio.

2. A listener hears the song and would like to listen to it on demand, so they head down to the album store and buy a CD or record.

3. Listener pays for product, leaves happy! Music!

4. Distribution label PROFITS!!! (though cut has to go to artist, agent, CD/record production, etc.. ).

The new model for music distribution:

1. Listener hears artist's music on Youtube, can play on demand for free, can contribute to artist directly!

2. ??? - sound of crickets chirping -

Not seeing the need for big labels anymore myself. They are trying to coerce money out of a system that is rapidly realizing this new reality. Good luck with that!

Let's have someone running around the office wearing goggles and brandishing a weapon at invisible beasties falling through the ceiling.

Don't see a problem at all with this.

Fluid turbulence is actually well understood and very easy to visualize. Yes, direct simulation of turbulence is very computationally expensive, but good mathematical models for the effect of turbulence in flows have been around for a while and are used in CFD modeling in many industries.

I can actually see turbulence; if I just go down to the river or look up at the sky, there it is. It's complex, but it obeys simple rules and you can actually develop a physical intuition about turbulence.

Not so with quantum physics, at least not yet. I think part of the problem is people rarely get to see the actual experiments that illustrate where quantum physics and Newtonian physics part company. A picture book that illustrates the weirdness physically, maybe some experimental data, would be a help. I recently read a book called "A Quantum Moment" by Crease and Goldhaber; it wasn't bad where it was describing the history of quantum theory, and it actually contains some math, but it just gives up in some sections and starts getting really airy-fairy and weird.

Anybody else read this and think, "Oh come on ... the physicists are just getting silly and making up shit now."

I'm still waiting for somebody to synthesize this whole field and make it halfway possible to visualize.

Oh really, this is your sole role in life Sysrammer - pedantic grammar Nazi? "Ooh...ooh, let's derail the whole topic with a style critique. "Four" is definitely more appropriate than "4". Clarifies everything! I must be superior! Everybody bow before the Great Clarifier!

Try to get laid Sysrammer. Success isn't guaranteed but you should try to actually do something with your life. Some desperate boy might let you in.

Your parents are probably praying for you to leave their basement and to actually do something useful with your life.

Did you have any other bullshit waste-of-time comment to add to this conversation? No? Good! GTFA

.

Oh, the democrat would have waged perpetual war against the brown-skinned west Asian? Wow, that would have changed everything, shocking, yeah. Um, no, actually...Raytheon et al. would have pushed perpetual war as a business model, as they did with the R in the White House.R, D, whatever. Ahem...if you didn't hear me clearly...it doesn't matter what you think - the elections have been decided for you, citizen. Celebrate in your freedom from ....eh, er.. freedom.

Cool, so flying dildos available for credit. Got it. Sweet! Party on fornicators! I'm just waiting for some hillbilly with a shotgun to intercept a package with a gasoline-fueled vibrator, a gas generator with a Sybian, and Twitter their neighbor's presidential aspirations away.

In the U.S. you have the choice of (what is termed in Europe) right of center and extreme right. Or maybe left = right. Whatever. You can (and I have) voted for Edward Snowden for every position from President down to dog catcher. No change here in the U.S. And U.S. stability means perpetual war . Come on mods...you haven't modded me to negative infinity yet. Maybe you are...curious?

Separating the people from the power maybe.

The interesting thing is the machine burns so much money every election to spin the idea that the people have a real choice.

Pay no attention to the man behind the curtain, citizens!

Mod this up, please! Don't be afraid of 4-letter words that start with F.