MODELING OF ELECTROMAGNETIC WAKES OF MOVING SUBMERGED BODIES IN STRATIFIED SEA-WATER

Moving submerged bodies create wakes behind them. The motion of the se a water, because of its conductivity, induces an electromagnetic pertu rbation ((b) over right arrow, (e) over right arrow) in the earth magn etic field <(B)over right arrow (T)>. In this paper, we propose a nume rical modelling of this perturbation. The water velocity field V(x,y,z ) is first computed in two different cases : turbulent wake obtained u sing a finite volume method, wave field by a perturbation method. Then , the corresponding electromagnetic perturbation is obtained by solvin g the Maxwell equations including the Lorentz term. For that, we use a finite element method.