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
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.
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.
![[CFD] Residuals in CFD (Part 1) - Understanding Residuals](http://i.ytimg.com/vi/v9OnNeYH4Ok/mqdefault.jpg)
thanks for being such a huge nerd :)) going to watch part 2 now :)
Oh good grief! Nightmares of physics past!
Love it!
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
you can have cavitation occur within a flow field which would make the fluid "vanish" in a volume of space within the control volume
This was great, short and sweet 👍
Outstanding , Thank You :)
I guess I need to brush up on my Continuum Mechanics👍
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.
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.