12. Fluid-structure interaction

◊ IFS = 'OUI',


Activation of the consideration of fluid-structure interaction. In this case, the fluid-structure interaction is taken into account via masses added with a dynamic calculation on a generalized basis.

12.1. Taking added strength into account

◊ FORC_AJOU = “OUI”,

This keyword manages the consideration of the added forces due to the seismic drive movement. Please refer to document [U4.66.03] for more details.

12.2. Fluid interface structure

♦ GROUP_MA_INTERF = interf, [gr_ma]

Define the fluid-structure interface mesh group

12.3. Fluid model

12.3.1. MODELISATION_FLU

♦ MODELISATION_FLU =/”3D”

/”COQUE”

Modeling type for the fluid model

12.3.2. GROUP_MA_FLUIDE

♦ GROUP_MA_FLUIDE = fluid, [gr_ma]

Group of meshes on which the fluid model is based.

12.4. Fluid properties

♦ RHO_FLUIDE = _F (…)

Keyword factor where one affects the characteristics of fluid material. If the density of the fluid varies over the fluid domain, these different densities must be specified by several occurrences of the keyword factor RHO_FLUIDE.

12.4.1. Operand RHO

♦ RHO = rho, [R]

Fluid density.

12.4.2. Operands TOUT/GROUP_MA

♦/TOUT = “OUI”,

/GROUP_MA = grma, [gr_ma]

Part of the fluid model to which rho density is applied.

12.5. Boundary conditions for the fluid problem

♦ PRESSION_FLU_IMPO = _F (…)

Keyword factor by which the boundary conditions of the fluid are specified (Dirichlet type).

12.5.1. Operand PRESS_FLUIDE

♦ PRESS_FLUIDE = near [R]

Keyword under which one specifies the value that one imposes on the hydrodynamic pressure (i.e. the pressure disturbance created by the vibration of the structure) on the topological entity determined below.

12.5.2. Operand GROUP_NO

♦ GROUP_NO = grno [gr_no]

Node groups where pressure is imposed on the fluid domain.