Lagrange Multipliers and Other Coupling Techniques

Abstract

In part II, the nonconforming constraints are adopted to couple different methods. Now, we solicit the additional integrals along the common boundary to play the same matching role. The traditional Lagrangian multiplier and the hybrid method by introducing extra variables on Γ₀ are described in this chapter. In the rest of this part we develop the coupling techniques without introducing extra variables. Using fewer variables is significant in computations. The overview of coupling techniques is given in this chapter; details of comparisons defer in Section 9.5.