Removing the Depth Dependence: Difference between revisions
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<math> | <math> | ||
\ | \Phi(x,y,z) = \cosh \big( k (z+d) \big) \phi(x,y) | ||
</math> | </math> | ||
where <math>k</math> is the positive root of the [[Dispersion Equation]] | |||
then the problem reduces to [[Helmholtz's Equation]] | |||
<math>\nabla^2 \phi - k^2 = 0 </math> | |||
in the region not occupied by the scatterers. | |||
Revision as of 11:09, 22 April 2006
If we have a problem in which the water depth is of constant depth [math]\displaystyle{ z=-d/math\gt (we are assuming the free surface is at \lt math\gt z=0 }[/math]) and all the scatters are also constant with respect to the depth then we can remove the depth dependence by assuming that the dependence on depth is given by
[math]\displaystyle{ \Phi(x,y,z) = \cosh \big( k (z+d) \big) \phi(x,y) }[/math]
where [math]\displaystyle{ k }[/math] is the positive root of the Dispersion Equation then the problem reduces to Helmholtz's Equation
[math]\displaystyle{ \nabla^2 \phi - k^2 = 0 }[/math]
in the region not occupied by the scatterers.
