In this paper we present a fast time-domain algorithm to study the electromagnetic pulse heating on dispersive medium. Using the proposed fast algorithm, the long heating process can be compressed by accelerating thermal conduction and scaling the power dissipation density. Comparing with the previous computation of several pulse periods, the proposed algorithm can deal with the heating process up to billions of pulse periods. Besides, employing the proposed algorithm, we study a 2D water post heated by electromagnetic pulses. The results reveal that comparing with continuous microwave heating, pulse heating cannot improve temperature uniformity or enhance heating efficiency.
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