1. But

Calculate mass, damping, or stiffness matrices added in a more condensed way than with CALC_MATR_AJOU [R4.07.03]. The matrices are induced by a perfect, incompressible fluid, at rest or in potential flow, on a 2D, 2D axisymmetric or 3D structure.

The terms of these matrices are calculated on the modal basis of the structure in a vacuum.

It is also possible to calculate by launching CALC_FORC_AJOU [U4.66.03] the vectors of the added forces induced by a seismic drive movement also calculated on the modal basis of the structure in a vacuum.

The advantage of this macro-control is essentially to mask the calls to linear thermal operators who calculate the hydrodynamic pressures caused by the vibration of the structure in the fluid. The user must now only enter the characteristics of his fluid domain and the air modes of the structure, with the operator in charge of calculating the matrices added.

The possibilities of the command retain those of the operator CALC_MATR_AJOU [U4.66.01].

Examples of how to use the macro command MACRO_MATR_AJOU are shown in the test case:

• FDLV101 [V8.01.101],

• FDLV102 [V8.01.102],

• FDLV106 [V8.01.106],

• FDLV108 [V8.01.108],

• FDLV109 [V8.01.109],

• FDLV112 [V8.01.112].