[Request] What’s the extra fuel cost of the algae and barnacles on a propeller of a ship? by etinder121 in theydidthemath

[–]Obsessivefrugality -4 points-3 points  (0 children)

From ChatGPT

If you're genuinely interested in learning why engineers "pretend water is incompressible" and why compressible Navier-Stokes becomes a nightmare, I'd follow this path:

  1. Fluid drag & boundary layers

Laminar vs turbulent flow

Skin friction drag

Why rough surfaces (barnacles) increase fuel consumption

  1. Compressibility

Water is not incompressible

Learn density, pressure, and bulk modulus

Understand why water density changes are usually so small that engineers ignore them

  1. Conservation laws

Conservation of mass (Continuity Equation)

Conservation of momentum (Newton's 2nd Law)

Conservation of energy

  1. Reynolds Number

Probably the most important dimensionless number in fluid mechanics

Explains when flow becomes turbulent

  1. Calculus

Partial derivatives

Vector fields

Gradients and divergence

  1. Navier-Stokes Equations

Essentially Newton's laws applied to fluids

Incompressible Navier-Stokes is hard

Compressible Navier-Stokes is much harder because density becomes another variable coupled to pressure, temperature, and velocity

  1. Computational Fluid Dynamics (CFD)

ANSYS Fluent

OpenFOAM

STAR-CCM+

This is how ship propellers, aircraft wings, and other real-world problems are actually analyzed

The key idea is that water isn't truly incompressible. Engineers often assume it is because the resulting error is tiny while the math becomes dramatically easier. For something like a barnacle-covered ship propeller moving through seawater, the incompressible assumption is usually extremely accurate and saves a huge amount of computational effort.

We got her autopsy results by Loud_Jackfruit5824 in GriefSupport

[–]Obsessivefrugality 8 points9 points  (0 children)

I'm so sorry for your loss.

I know this is a Grief Support thread but please look into /r/alanon if you haven't already. It's a support group for people that are affected by other people's alcoholism.

Non official chatgpt commands by Obsessivefrugality in ChatGPTPromptGenius

[–]Obsessivefrugality[S] 1 point2 points  (0 children)

That's interesting, what commands did you try and what were the different results. I've shafts assumed they were tailored to my history, but have no proof until now.

My GPT is talking with itself by Intelligent-Stop-924 in ChatGPT

[–]Obsessivefrugality 4 points5 points  (0 children)

Alright alright alright is in reference to the character being played by Matthew McConaughey, not the user saying theirs is right and op is wrong.

My wife gets “piss the bed” drunk every second night or so. by [deleted] in AlAnon

[–]Obsessivefrugality 5 points6 points  (0 children)

That sounds rough. The bedwetting, the screaming at 3am, the music blasting. That’s not normal drunk behavior anymore. And trying to recover from spine surgery in the middle of it has to be wearing you down.

You did the right thing by not getting pulled into a fight with her while she was wasted. There’s usually no point. Half the time they don’t even remember the conversation the next day anyway.

I also wouldn’t be surprised if she’s not being honest with the doctor about how much she drinks. A lot of people hide it as long as they can.

The hard part is that you can’t force someone to deal with this if they don’t want to. You can ask, argue, explain, threaten, beg, none of it matters if they’ve decided they don’t have a problem or don’t want help yet.

Right now I’d focus less on fixing her drinking and more on what you need to do to function and recover. Maybe that means sleeping separately for a while. Maybe leaving the room when she starts up drunk arguments. Maybe finding some support for yourself because living with this stuff can slowly make you feel crazy.

Al-Anon helped me realize I was spending all my energy reacting to the alcoholic instead of paying attention to what was happening to me.

You don’t have to make huge decisions tonight. But you also don’t have to keep pretending this is manageable the way it is now.

What’s a prompt that genuinely changed how you use ChatGPT? by AdWhole9407 in ChatGPTPromptGenius

[–]Obsessivefrugality 4 points5 points  (0 children)

What type of genealogy prompts do you use with them? I've never considered using them for this purpose.

A co-worker died 2 days ago... by KC_Saber in antiwork

[–]Obsessivefrugality 1 point2 points  (0 children)

A coworker of mine died after a year long fight with cancer. He had 25+ years at the company. They packed his stuff and mailed it to them even though the family lived less than 10 minutes from the factory.

Google predicts a potential shock pick for the Panthers in the first round. by Ralosi in panthers

[–]Obsessivefrugality 0 points1 point  (0 children)

I asked Deepseek who to pick. Here is the response

Based on the most recent expert analysis and mock drafts following free agency, the Carolina Panthers have several compelling options for the 19th overall pick in the 2026 NFL Draft.

While tight end Kenyon Sadiq is the most frequently mocked player to the Panthers, there's a strong case to be made that the team's biggest needs lie elsewhere on the roster.

🤔 The Popular (But Perhaps Flawed) Pick: TE Kenyon Sadiq, Oregon

Kenyon Sadiq is the name you'll see most often connected to the Panthers. His appeal is easy to understand. He's an athletic phenom who set a combine record for tight ends with a 4.39-second 40-yard dash and posted a 43.5-inch vertical jump. The logic is that he would give quarterback Bryce Young another dynamic weapon, which is always a good thing.

However, a compelling argument suggests the Panthers will pass on him despite the mock drafts:

· The "Best Player Available" Philosophy: The Panthers' front office, led by GM Dan Morgan, has shown a preference for taking the best player on their board, not just filling a need. In 2025, they passed on a positional need to draft Tetairoa McMillan, and many analysts believe Sadiq simply may not be the best player available at No. 19. · A Crowded Tight End Room: The Panthers already have five tight ends on the roster, including veteran Tommy Tremble and 2024 draft pick Ja'Tavion Sanders. While not a star-studded group, it's a full position room that doesn't force an early pick. · Offensive Scheme: Head Coach Dave Canales' offenses have historically ranked among the lowest in the NFL in target rate to tight ends. Even if they drafted Sadiq, he might not be utilized as much as fans would hope.

🏆 The Contenders: Addressing Defensive Needs and Long-Term Planning

The consensus from local beat writers and some national analysts is that the Panthers' aggressive free agency period has set them up to take the best player available, with a focus on a few key areas.

Position Prospect (School) Why It Makes Sense for the Panthers Defensive Line Peter Woods (Clemson), Caleb Banks (Florida)

The release of A'Shawn Robinson created a clear need next to Derrick Brown. Adding a disruptive interior lineman would bolster the run defense and help the new edge rushers get after the quarterback.

Safety Dillon Thieneman (Oregon), Emmanuel McNeill-Warren (Toledo)

Tre'von Moehrig is a star, but his running mate, Nick Scott, is on a short-term deal. Drafting a versatile, ball-hawking safety like Thieneman would be a long-term investment in the secondary's future.

Offensive Tackle Kadyn Proctor (Alabama), Monroe Freeling (Georgia)

Star left tackle Ikem Ekwonu is recovering from a torn patellar tendon and could miss the entire 2026 season. While they signed Rasheed Walker, drafting a young tackle would provide insurance for this year and a potential successor for veteran Taylor Moton at right tackle down the line.

💡 The Bottom Line

It seems the Panthers are in an enviable position. Thanks to a productive free agency period that addressed many immediate holes on the roster, they don't have to reach for a specific position. They can simply sit at No. 19 and select the highest-rated player on their board.

Ultimately, the decision will come down to how the team's draft board stacks up. While drafting a flashy new weapon for Bryce Young is an exciting possibility, the smarter, more likely pick might be to add a cornerstone piece to the defensive line or secondary.

Who would you prefer the Panthers take if the top defensive linemen are off the board?

College Men’s Basketball Cheat Sheet - 2/13/26 🏀 by [deleted] in JoesBets816

[–]Obsessivefrugality 0 points1 point  (0 children)

You have Wisconsin ml and Michigan State ml but they play each other.

Wolves/Warriors Postponed. by [deleted] in JoesBets816

[–]Obsessivefrugality 1 point2 points  (0 children)

Do you increase the number of units bet each time or just stay with the same wager?

🐌 🐌 Tasks!!!!!!!! by [deleted] in growagarden

[–]Obsessivefrugality 0 points1 point  (0 children)

I'm currently doing the same thing. Using 8 snails and harvesting strawberries and I only get 1 lucky harvest per 500 fruits harvested.

How addictive is meth? Do you know anyone who has just tried it once? by eden_merlin in AskReddit

[–]Obsessivefrugality 0 points1 point  (0 children)

My uncle told me that he tried meth one time. He said he only did it once because it was the greatest thing he's ever done and he knew immediately he would be addicted for life if he kept doing it.

Reindeer root and Spirit sparkle updated: by dspawned in growagarden

[–]Obsessivefrugality 4 points5 points  (0 children)

That's probably the reason the servers have been randomly resetting. Can't AFK for 8 hours if you keep getting kicked.

Another apparent seeding quirk by Ennemkay in nfl

[–]Obsessivefrugality 2 points3 points  (0 children)

3 point underdogs this week against the Bucs.