V. Girault et al., A boundary multiplier/fictitious domain method for the steady incompressible Navier-Stokes equations, NUMER MATH, 88(1), 2001, pp. 75-103
We analyze the error of a fictitious-domain method with boundary Lagrange m
ultiplier. It is applied to solve a non-homogeneous steady incompressible N
avier-Stokes problem in a domain with a multiply-connected boundary. The in
terior mesh in the fictitious domain and the boundary mesh are independent,
up to a mesh-length ratio.