Particle velocity

Particle velocity can be calculated from acoustic pressure through the relationship [6]

$$\mbox{$\mathbf{v}$}= -\frac {i}{\omega \rho}\mbox{\boldmath$\nabla$}P ,$$ (18)

where $\rho$ represents the density of the watercolumn and $\omega$ is the circular frequency of the propagating acoustic wave. Since Trace&Traceo solve the Eikonal and dynamical equations in the case of cylindrical symmetry the vector of particle velocity is calculated only as $\mbox{$\mathbf{v}$}= (u,w)$, where $u$ and $w$ represent the horizontal and vertical components of $\mbox{$\mathbf{v}$}$, respectively.