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Previously, we developed a late time approximation scheme to study theinterior geometry of black holes. In the present paper we test this scheme withnumerical relativity simulations. In particular, we present numericalrelativity simulations of the interior geometry of charged sphericallysymmetric two-sided black holes with a spacelike singularity at $r = 0$. Ournumerics are in excellent agreement with the late time approximation. We alsodemonstrate that the geometry near $r = 0$ is a scalarized Kasner geometry andcompute the associated Kasner exponents.

Numerical evolution of the interior geometry of charged black holes