A Parameterized Splitting Preconditioner for Generalized Saddle Point Problems

Figure 3

Spectrum of the preconditioned steady Oseen matrix with viscosity coefficient 𝑣=0.001,32×32 grid. (a) Q2-Q1 FEM, 𝐶=0; (b) Q1-P0 FEM, 𝐶≠0.

(a)

(b)