PHG (Parallel Hierarchical Grid) is a scalable paral lel adaptive finite element toolbox under active development at the State Key Laboratory of Scientific and Engineering Computing, Chinese Academy of Sciences. This paper demonstrates its application to adaptive finite element computations of electromagnetic problems. Two examples on solving the time harmonic Maxwell's equations are shown. Results of some large scale adaptive finite element simulations with up to 1 billion degrees of freedom

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... d using up to 2048 CPUs are presented. . Mark the elements whose local error estimate is large. 4. Refine the mesh T h by dividing the marked elements and possibly some other elements, in order to maintain conformity of the mesh, into smaller elements. Goto step 1.