Mod-01 Lec-26 Rayleigh-Taylor ‘heavy over light’ instability

[@jyotipriyaroy1739]

24:40, while writing momentum equation why the last term in RHS i.e, grad*2(u) is neglected?

[@roniththakur5547]

The fluids were assumed to be inviscid. So, the forces due to viscosity are neglected from the momentum equation.