申論題

2. (8%) Introduce the following dimensionless terms into the Navior-Stokes equation:
 u* =u/u∞, dimensionless velocity
P* =P/ρu∞², dimensionless pressure
 t*=t u∞/L, dimensionless time
 x* =x/L, dimensionless distance
 The operator∇ may then written ∇*/L. Show that the Navior-Stokes equation becomes