## Application of movable meshes for solving multi-liquid problems

Movable meshes are based on the method of overset meshes and realized in such software products as STAR-CCM+ and ANSYS Fluent. For discretization of the calculated area, several different networks are used that collide one another in random way, are applied in this approach. They are most useful in problems including one or several movable rigid bodies and for optimizing calculations as well. In most cases, no mesh modification is required after construction of the initial mesh model during application of overset meshes; thus, it provides the higher flexibility as compared with the standard methods of discretization of the calculated area.

The overset meshes are most frequently for:

− parametrical studies, for example, of identical bodies at relatively different positions or of different bodies in the same environment;

− calculation of complex motions of objects, e.g. those located close to each another, as well as having overset motion trajectories or moving at long distances.

This report includes demonstration of application of this technology for solving the problem of rigid body motion in two-liquid environment under the effect of outside forces. The law of rigid body motion is determined using numerical calculation in the software STAR-CCM+; it is impossible to make the exact analytical solution for this aspect. Problems of such type arise in many industrial fields, and namely:

− floating body motion over free surface of fluid;

− body motion in the water with cavitation air space;

− motion of control rods in reactor plants.

Verification was made for the constructed CFD model using the problem of flooding of vertically moving homogeneous rod under applied force.

Full version (russian)