For the purpose of air flow, fluid dynamics can be used.
So when designing an intake, air flow has the same properties as water flow. Differences begin to appear between the two when pressure and temperature are added into the mix. Since a T/C or S/C is not being considered in the design then pressure has no real bearing on the design. So the major design concern is about having the coolest possible air flow intow the intake. The time and effort involved in tuning the intake (without tuning the exhaust as well) just doesn't have enough gains to worry about.
