Question

In the Navier-Stokes equations, what does the diffusion term represent O a) change in velocity over time Ob) fluid flow in the direction of largest pressure change O internal forces acting on the fluid d) external force acting on the fluid

Answer 1

Step-by-step explanation:

In the Navier-Stokes equations, the diffusion term represents the internal forces acting on the fluid.

The Navier-Stokes equations are a set of partial differential equations that describe the motion of fluid substances, taking into account factors such as velocity, pressure, and viscosity. These equations are derived from the principles of conservation of mass and momentum.

The diffusion term, also known as the viscous term, arises from the viscous nature of fluids. It accounts for the internal forces within the fluid that resist the flow and cause the fluid to exhibit viscosity. This term represents the diffusion or spreading of momentum within the fluid due to its viscosity, which leads to velocity changes and frictional effects.

Therefore, option (c) "internal forces acting on the fluid" is the correct representation of what the diffusion term signifies in the Navier-Stokes equations.