ABSTRACT
In many applications, the governing PDEs include several variables (which are physically interesting) such as the velocities and pressure for fluid modeling using Navier-Stokes equations. The mixed finite element method is developed to approximate those variables simultaneously. One of the main issues in mixed methods is how to choose those finite element spaces such that the mixed methods will be more efficient and stable. In this chapter, we will introduce the basic theory and practical implementation for such methods.
