Approximate solutions of fluid mechanics and their physical interpretation
Abstract
Approximate relations for the determination of frictional drag in the case of a planar plate with a turbulent boundary layer are examined. The momentum equation of fluid mechanics provides the basis for the theoretical study of the problem. Other approximate solutions considered are related to the problems of sudden pipe enlargement, unsteady tank efflux, and lift on an airfoil. The discussed examples illustrate that an analysis of the basic considerations involved in the derivation of an approximate solution can provide important information regarding the quality of the selected mathematical model concept.
 Publication:

Zeitschrift fur Flugwissenschaften
 Pub Date:
 August 1976
 Bibcode:
 1976ZFlu...24..177T
 Keywords:

 Flat Plates;
 Flow Theory;
 Fluid Mechanics;
 Friction Drag;
 Turbulent Boundary Layer;
 Aerodynamic Drag;
 Airfoils;
 Approximation;
 Flow Distribution;
 Lift;
 Mathematical Models;
 Momentum Theory;
 Pipe Flow;
 Fluid Mechanics and Heat Transfer