Ratings ========= .. csv-table:: ":math:`p` ", "the fluctuating pressure in the fluid," ":math:`{\gamma }_{l}^{\mathit{fs}}` ", "outline of the structure indexed by :math:`l` surrounded by the fluid domain" ":math:`{\ddot{x}}_{{s}_{l}}` ", "the field of movements in the :math:`l` structure," ":math:`{\rho }_{f},{\rho }_{s}` ", "the density of the fluid, of the structure," ":math:`{\mathrm{X}}_{\mathit{il}}` ", "the :math:`i` order clean mode of the :math:`l` structure in air" ":math:`\begin{array}{}{a}_{\mathrm{il}},{\dot{a}}_{\mathrm{il}},\\ {\ddot{a}}_{\mathrm{il}}\end{array}` ", "the coordinates, velocities, generalized accelerations relating to the :math:`i` mode of the :math:`l` structure in air" ":math:`\mathrm{\sigma }` ", "the stress tensor in the structure" ":math:`\Phi` ", "the fluid flow vector" ":math:`H` ", "the fluid stiffness matrix" ":math:`v` ", "the field of fluid fluctuating velocities" ":math:`n` ", "the internal normal of the fluid domain."