function [icefront unstable]=PenaltyConstrain(icefront,grids,materials,inputs)
%PENALTYCONSTRAIN - returns 0
%
%   there is no unstable element on the icefront
%
%   Usage:
%      [icefront unstable]=PenaltyConstrain(icefront,grids,materials,inputs)
% 
%   See also PENALTYCREATEKMATRIX, PENALTYCREATEKMATRIX

unstable=0;
