Turbulent kinetic energy
= Turbulent kinetic energy
{title2=$e_t=\tfrac12\overline{u_i'u_i'}$}
Kinetic energy per unit mass in velocity fluctuations. Mean shear, buoyancy and transport supply or redistribute it, while molecular viscosity dissipates it. Its local budget motivates the <local turbulent kinetic energy balance> when storage and transport are negligible.