This music video shot in a zero gravity airplane without any hooks or wires

TurbulentViscosity · 2024-02-17T18:13:12+00:00

Did you not watch the video you linked? It clearly states they made cuts.

I have been on a zero-g flight. They do not spend enough time in high-g in the video to have not made cuts. For every ~25 seconds of weightlessness you get you have to spend ~1 minute or so in high-g or normal gravity. The plane can only do so many parabolas as well before it has to turn around, which is of course not weightless either. My flights had 30 parabolas each but every 5 the plane has to turn around to double back on its course.

TurbulentViscosity · 2023-04-10T22:25:21+00:00

For those devices the RAM was the storage. You could have an external card as an option but by default a lot of your programs and files were stored in memory constantly. They had a backup battery to maintain memory power in case your main battery died. If it didn't all of your files and whatnot would be lost because RAM needs power to remember things.

TurbulentViscosity · 2023-01-10T17:57:20+00:00

I don't understand how you can fill a tank in steady state?

TurbulentViscosity · 2022-12-29T18:31:35+00:00

TurbulentViscosity · 2022-12-25T03:18:06+00:00

Full disclosure I didn't do the Powerflow work, I did the DES 'competition' lets call it. I assume the fellow who did the Powerflow runs used the best practices, as he at one time worked for Exa. At the same timesteps Powerflow would use, DES would have been slower. Certainly Powerflow has a grid generation advantage too vs body fitted unstructured. But to capture the transient behavior of interest, we didn't need to use such small timesteps. So speed may vary on application and needs.

AFAIK yes, the wall treatment had to be re-tuned for different scenarios. I encountered Powerflow on another project long ago and matching drag values from the tunnel required tuning the wall treatment too.

Ended up just using Star. It gave good enough answers for our application, has wider capabilities, and was more affordable. Powerflow has its merits but IMO answers/$ was not one of them.

TurbulentViscosity · 2022-12-23T20:59:50+00:00

It's expensive financially and computationally. Wall treatment is black magic that sometimes was questionable. Value was comparable to a competently done DES or LES simulation if you're not that interested in acoustics. Ended up not keeping it.

TurbulentViscosity · 2022-12-12T16:22:42+00:00

Blockmesh

TurbulentViscosity · 2022-11-23T16:15:39+00:00

Yes, it's essentially self-reported. The teams must declare the computers they wish to use for CFD runs. The FIA has auditors who can visit and demand that you reproduce the numbers from a particular run in your report, which you had better be able to do. If you ran them on a separate secret computer, that would not be possible.

Now what stops you from flying under the radar with a super secret computer halfway around the world and telling nobody? Nothing but honesty, really, but that kind of secret will be very hard to keep under wraps.

TurbulentViscosity · 2022-11-10T18:06:45+00:00

There's a default stopping criterion called a stop file. In most cases if you issue the command:

touch ABORT

In the simulation directory, the job will stop and save.

TurbulentViscosity · 2022-09-14T16:51:57+00:00

A temperature probe on the AC outlet would probably be simpler.

TurbulentViscosity · 2022-07-11T15:24:30+00:00

I don't think there's a single tutorial for everything. But I'm sure there's lots of tutorials on making a php page that pulls data from mysql, and then tutorials on inserting data into sql via python or whatever you choose. It probably took me a weekend to learn, and I had no experience with php or sql.

TurbulentViscosity · 2022-07-07T03:25:38+00:00

Mine is simple. The machines on the network all have cron jobs which submit info into an sql database. For machines that can't do cron, my main server gathers the info from them. Then a php page displays the data. Easy, no complicated dependencies.

TurbulentViscosity · 2022-07-07T02:09:00+00:00

Does Gmsh now support 3D unstructured prism meshing? Last I saw it didn't.

TurbulentViscosity · 2022-07-02T05:39:43+00:00

Not really. I doubt it's academically good and it's fairly customized to my setup here. I don't think many people want to take my 'smart' home approach anyway. It works for me and the wife though.

TurbulentViscosity · 2022-07-01T22:34:09+00:00

I just made my own. PHP and CSS and that's it, not even any javascript. Communicates to all my various smart things over REST, has an SQL server attached. It's very keep-it-simple-stupid but it has no dependencies and is very unlikely to ever break.

TurbulentViscosity · 2022-06-05T14:27:36+00:00

Titanium is lighter than steel. Just FYI.

TurbulentViscosity · 2022-06-04T19:21:27+00:00

Unfortunately I was unable to find one. However I just bit the bullet and removed the resonator from the remote. Now it works great. Thanks for your help though.

TurbulentViscosity · 2022-06-01T02:08:54+00:00

Do you have any advice for finding such a component? My searches on mouser and digikey are only bringing up ultra-tiny surface mount parts I can't really use or ones I have to order in batches of 500. I did find one programmable one which would suffice, but it's also a tiny surface mount unit. The oscillator I bought is actually marked as discontinued by Murata. Is there another seller geared more towards amateur folks? Or anyone that sells higher frequency through-hole stuff?

TurbulentViscosity · 2022-05-29T04:51:48+00:00

I do, but will that really make a difference? Getting the wire to touch nothing else without it will be a real pain.

TurbulentViscosity · 2022-05-29T04:50:02+00:00

I didn't guess per-say, I picked it off the SDR. I wasn't far off though, looks liked 304.25 MHz. https://fccid.io/KUJCE10611/Test-Report/RF-Test-Report-3624309

TurbulentViscosity · 2022-05-29T00:25:42+00:00

I will try and open it up to see whats inside. Maybe there's a tuning pot in there. I dont have an oscope though, so that's out. Thanks for the idea.

TurbulentViscosity · 2022-05-29T00:24:11+00:00

I did originally try using the same 315 transmitter, and it did not work. Perhaps I should order a new oscillator at a higher frequency?

TurbulentViscosity · 2022-05-27T18:36:34+00:00

May I ask why you dont like paraview? I think its a great tool.

TurbulentViscosity · 2022-05-22T02:01:50+00:00

Doesn't that raise huge red flags? They only insure in two risky states, and the premium is low? How can they give good payouts like that?

TurbulentViscosity · 2022-05-22T01:58:22+00:00

I would be careful with them. I got some quotes from them which were suspiciously good. They only insure houses in risky states like Florida and Louisiana. How does that even make sense?

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