1. Reference problem#

1.1. Geometry#

\(L=50m\)

\({R}_{i}=1m\)

\({R}_{e}=1.1m\)

\(C\): pivot point of the external structure

Fluid: density \({\rho }_{g}=1000\mathrm{kg}/{m}^{3}\) (water).

Structure: \({\rho }_{s}=7800\mathrm{kg}/{m}^{3}\); \(E={2.10}^{11}\mathrm{Pa}\); \(\nu =0.3\) (steel).

Fluid:

to simulate the permanent flow, a normal speed of \(–4m/s\) is imposed on the fluid inlet face (by thermal analysis, a normal heat flow equivalent to —4 is imposed),
to calculate the fluid disturbance caused by the movement of the Dirichlet external cylinder at a fluid node.

Structure:

the external cylinder is subjected to a displacement of the type

at the nodes of the mesh of this cylinder.