We develop a nonoverlapping domain decomposition preconditioner for the C0 interior penalty method, a discontinuous Galerkin method, for the biharmonic problem. The preconditioner is based on balancing domain decomposition by constraints (BDDC). We prove that the condition number of the preconditioned system is bounded by C(1+ln(H/h))2, where h
Nearby in the stack
is the mesh size of the triangulation,
H
is the typical diameter of subdomains, and the positive constant
C
is independent of
h
and
H
. Numerical experiments are also represented to corroborate the theoretical result.