The application note presents Smart reduction, a WIPL-D Pro feature, investigated on the model of a frigate warship. The Smart reduction is very suitable for antenna placement problems. Based on adaptive reduction of current expansion order over parts of the model which are distant from the antenna or in shadow, the number of unknowns can be significantly reduced, while very good accuracy of calculated radiation pattern or coupling between multiple antennas is preserved.
Model of the frigate warship is 117 meters long and 12.6 meters wide. The ship is placed above a PEC plane which models the influence of the sea. A monopole antenna is placed on the top of 24 meters high communication tower (the simulation frequency is 240 MHz).
The number of unknowns was decreased about 2.5 times without significant discrepancies of the calculated radiation pattern. A 94 wavelengths long frigate is modeled by 33,564 unknowns and simulated in minutes. The hardware configuration is regular desktop PC, where usage of single inexpensive GPU card can speed up simulation time several times.