7:Blended Dirchlet Outer boundary
Evolves “forever” with the following model problem
Schwarzschild (Ingoing Eddington-Finkelstein) and Kerr spacetimes used.
Inner boundary differencing done to O(h2) with the truncation error matched to centered differencing operators.
Excised 2-sphere of radius r0=2M-ph(h=grid spacing, p=number of buffer zones).
Blended shell of inner and outer radii, R0 and R1,
- r> R1 Dirichlet values
- R0<r<R1 Blending
- R<= R0 Cauchy