Magnetic signature of submarine
Magnetic signatures of naval vessels
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A vessel traveling on the surface
or under water gives rise to
detectable local disturbances in
the Earth's magnetic field.
These disturbances can be used
to trigger weapon systems.
This can be avoided by
demagnetizing the vessel by
generating a counteracting
magnetic field.
Problem Definition
Top: Vm=1989 (A) - corresponding to B0=0.5 (G)
   r 0 Vm   0
vessel parameters:
length: 30 m
diameter: 5 m
hull thickness: 5 cm
r  700
Sides:
 r 0Vm  n  0
Bottom: Vm=0
Weak form shell equation:
-(mu0_nc*MUR*th*VmTx*VmTx_test+
mu0_nc*MUR*th*VmTy*VmTy_test+
mu0_nc*MUR*th*VmTz*VmTz_test)
Results