At 32:00, what does it mean numerically calculate? We have already assumed F=0 at wall, then how do we change the value like this in the middle? F'' should be 0, shouldn't it?
I think drag takes into account both wall drag (caused by shear stress) and also form drag (caused by pressure). Where as skin friction accounts only for wall drag.
Drag has many different components especially when considering a 3D airfoil. In the boundary layer equations it is important to identify the velocity profile and consequently wall sheer stress because the skin friction is the main component of drag in a 2D sense. What you need to know is skin friction is drag, but only one component of the very complicated total drag.
At 32:00, what does it mean numerically calculate? We have already assumed F=0 at wall, then how do we change the value like this in the middle? F'' should be 0, shouldn't it?
It's drag force, that he is calculating on the plate.
Thank you Professor.
Thank you very much Sir.
Can anyone explain drag and skin friction difference
I think drag takes into account both wall drag (caused by shear stress) and also form drag (caused by pressure). Where as skin friction accounts only for wall drag.
Drag has many different components especially when considering a 3D airfoil. In the boundary layer equations it is important to identify the velocity profile and consequently wall sheer stress because the skin friction is the main component of drag in a 2D sense. What you need to know is skin friction is drag, but only one component of the very complicated total drag.
@@suryakarla8628 thank you for response
@@ItsMauiBruh thank you for response
Informative lecture sir