Consider the solution of
capillary surface equation over domains with corners. It is shown that there exists an
asymptotic expansion of the solution at the corner if the corner angle 2α satisfies
0 < 2α < π and α + γ > π∕2 where 0 < γ ≤ π∕2 is the contact angle between the
surface and the container wall. It is assumed that the corner is bounded by lines. The
leading terms of the expansion are calculated and properties of the remainder are
given.