ЧИСЛЕННОЕ ТРЕХМЕРНОЕ МОДЕЛИРОВАНИЕ ЗАДАЧ ГИДРОДИНАМИКИ НА СЕТКАХ, СОДЕРЖАЩИХ НЕСОГЛАСОВАННЫЕ СЕТОЧНЫЕ ИНТЕРФЕЙСЫ

Аннотация

The paper describes a numerical method, which considers
specific CFD (computational fluid dynamics) aspects of viscous incompressible
flow simulations in the vicinity of interfaces between nonconforming grid
fragments. An example implementation of the method is presented for the
case of the finite-volume approximation of the Navier-Stokes equations.
The method is based on the GGI (General Grid Interface) principle,
which does not require initial grid modification and involves conservative
flux interpolation. This method enables simulations of viscous incompressible
flow simulations on grid models of complex-geometry structures composed
of several independently constructed grid fragments, which have nonconforming
grids at adjacent boundaries and can be joined together through nonconforming
interfaces. The paper reports simulation results for turbulent flow in
a circular tube with an abrupt reduction in diameter on a grid model
composed of nonconforming unstructured grid fragments. The effect of
the nonconforming interface on the accuracy of solution and the rate of
convergence of iterations is demonstrated.