GUTS OF CFD: Navier Stokes Equations

[@markoj3512]

Sorry but your equation ist wrong! At 7.25 you are mixing tensor notation with index notation. the term rho Du/Dt = du/dt + udu + u*dv. also the Laplace term is not correct. Please Leupold this video with the correct and consize notation.

[@markoj3512]

At 7.56 the continuity equation is wrong. the correct form for the unsteady term ist "d rho / d t" and not "D rho / D t"! the diferentantial operator with the capital d include also the convective term. And for the continuity equation you don't need it! Maybe you are mixing eulerarian and langrangian framework. Be consicely

[@shaider1982]

I guess I need to brush up on my Continuum Mechanics👍

[@DatawaveMarineSolutions]

Yes and no. I can tell you most CFD engineers do not have Navier Stokes memorized. I sure don't. I would argue that with most CFD, it's important to have a conceptual understanding of the theory, and be able to reference back to theory for a quick refresher when debugging a simulation. The exception to this are the people who actually program the CFD software.

[@nobody46820]

Oh good grief! Nightmares of physics past! Love it!

[@aion2177]

thanks for being such a huge nerd :)) going to watch part 2 now :)

[@9090Glenn]

you can have cavitation occur within a flow field which would make the fluid "vanish" in a volume of space within the control volume

[@aarongettingup]

Outstanding , Thank You :)

[@beachboardfan9544]

This was great, short and sweet 👍