# What Is The Equation On This Guy's Shirt? **URL:** \ **Category:** Factual Questions\ **Created:** [July 8, 2018, 2:22pm UTC](https://boards.straightdope.com/t/what-is-the-equation-on-this-guys-shirt/817520 "2018-07-08T14:22:22Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![HeyHomie](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/heyhomie/32/207_2.png) [@HeyHomie](https://boards.straightdope.com/u/HeyHomie)\ **Post date:** [July 8, 2018, 2:22pm UTC](https://boards.straightdope.com/t/what-is-the-equation-on-this-guys-shirt/817520/1 "2018-07-08T14:22:22Z")
In [this video](https://youtu.be/XWJo12lVSbA?t=6s)? ---
**Author:** ![pulykamell](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/pulykamell/32/3166_2.png) [@pulykamell](https://boards.straightdope.com/u/pulykamell)\ **Post date:** [July 8, 2018, 2:37pm UTC](https://boards.straightdope.com/t/what-is-the-equation-on-this-guys-shirt/817520/2 "2018-07-08T14:37:44Z")
It looks to me to be some sort of fluid mechanics equation, but I can’t pinpoint which one. I’m sure someone will fill in the gap, soon, though. ETA: It looks like some form of the Navier-Stokes equations to me, if you want to try fishing around. ---
**Author:** ![Jragon](https://avatars.discourse-cdn.com/v4/letter/j/e19b73/32.png) [@Jragon](https://boards.straightdope.com/u/Jragon)\ **Post date:** [July 8, 2018, 7:57pm UTC](https://boards.straightdope.com/t/what-is-the-equation-on-this-guys-shirt/817520/3 "2018-07-08T19:57:18Z")
It looks like the incompressible form of the Navier-Stokes momentum equation where rho is 1 and, due to incompressibility, abla . u = 0. The only part that eludes me is the variable a on the RHS, because every version I can find has another instance of u there. Otherwise everything fits with minor naming tweaks. ---
**Author:** ![watchwolf49](https://avatars.discourse-cdn.com/v4/letter/w/e9c0ed/32.png) [@watchwolf49](https://boards.straightdope.com/u/watchwolf49)\ **Post date:** [July 8, 2018, 10:43pm UTC](https://boards.straightdope.com/t/what-is-the-equation-on-this-guys-shirt/817520/4 "2018-07-08T22:43:54Z")
“It looks complicated, must be Navier-Stokes …” ---
**Author:** ![SantaMan](https://avatars.discourse-cdn.com/v4/letter/s/da6949/32.png) [@SantaMan](https://boards.straightdope.com/u/SantaMan)\ **Post date:** [July 9, 2018, 2:19am UTC](https://boards.straightdope.com/t/what-is-the-equation-on-this-guys-shirt/817520/5 "2018-07-09T02:19:48Z")
> [@watchwolf49](#): > > “It looks complicated, must be Navier-Stokes …” Do we add this to the perennial reference list that includes Rio, by Duran Duran Carmina Buranda Powerhouse ---
**Author:** ![pulykamell](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/pulykamell/32/3166_2.png) [@pulykamell](https://boards.straightdope.com/u/pulykamell)\ **Post date:** [July 9, 2018, 4:25am UTC](https://boards.straightdope.com/t/what-is-the-equation-on-this-guys-shirt/817520/6 "2018-07-09T04:25:06Z")
> [@SantaMan](#): > > Carmina Buranda Carmina Burana. I think your brain has crossed that with Carmen Miranda. 🙂 ---
**Author:** ![Tastes\_of\_Chocolate](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/tastes_of_chocolate/32/3232_2.png) [@Tastes\_of\_Chocolate](https://boards.straightdope.com/u/Tastes_of_Chocolate)\ **Post date:** [July 9, 2018, 5:03am UTC](https://boards.straightdope.com/t/what-is-the-equation-on-this-guys-shirt/817520/7 "2018-07-09T05:03:47Z")
The shirt has a logo and company name on the sleeve. Converge Software. Poking around, I find [convergecfd.com](http://convergecfd.com), which has the same logo and also the company name Convergent Science. They describe themselves as ["Convergent Science is an innovative, rapidly expanding computational fluid dynamics (CFD) company. "](https://convergecfd.com/), which makes fluid dynamics the right field.