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In this paper, we present a nonconforming immersed finite element method for solving elliptic optimal control problems with interfaces. The immersed finite element space is constructed based on the rotated-Q1 nonconforming finite elements with the integral-value degrees of freedom. The method can overcome the difficulties encountered by conforming immersed finite element method. We derive error estimates for the control, state and adjoint state in both energy andnorms. Numerical results are reported to support the theoretical analysis.

Nonconforming immersed finite element method for solving elliptic optimal control problems with interfaces