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My silly-wild-___-guess is that it's a differential equation of continuity for steady,incompressible flow,with curvilinear orthogonal coordinates.
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Partial differential equation
So that should clear up the little lowercase delta symbols all over the place
That's the sort of thing a professor would show a class to scare everyone
I can't see all the details, but I'm fairly certain that's in a spherical coordinate system -- note the "r" direction, "theta" direction and "phi" direction (if you don't know where to look for that, let me know and I'll go in detail).... If that's an "r" and I'm not misreading it, that's almost a dead giveaway of some cylindrical or polar or spherical shenanigans
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The equation is very exotic and so sophisticated, I'm presuming that its an algorithm for computational fluid dynamics which can deal with flow separation,however for whats shown,a newcomer like me will never be able to crack it.
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That's no algorithm - but you're very right in that it's exotic
Finite element algorithms will probably have iteration sub or super scripts.
If it really is a spherical coordinate system, it's probably not worth worrying about for car application... Cartesian coordinate systems (x,y,z or whatever letters you prefer) are very practical as you can quickly see forces in intuitive directions - up/back/side --> lift/drag/??? (if you're getting a side force in a symmetric object, there's a problem with your CFD)