For the past 30 years, the ability of engineers to perform Computational Fluid Dynamics simulations of the interaction between multiple moving objects has been severely curtailed by the need to generate an interconnected mesh between the objects. Not only did this requirement make the creation of "moving mesh" simulations an intensive manual process, it also often rendered it impossible in the case of objects with extreme ranges of motion or with very close interaction.
The term 'paradigm shift' may be overused, but the availability of Overset Mesh (sometimes called "overlapping" or "chimera" mesh) in STAR-CCM+ truly offers a new way of carrying out CAE, allowing the user to generate an individual mesh around each moving object which then can be moved at will over a background mesh. The feature also allows regions to travel to, and beyond, the boundary of the domain, improving the flexibility of overset grids and allowing the simulation of very close moving bodies.
The Overset Mesh capability is fully compatible with the full range of unstructured meshing options in STAR-CCM+. With no need to worry about interconnecting meshes or cell distortion, this capability brings genuine moving object simulation within the grasp of all engineers.
In addition Overset Mesh can also be used for parametric studies, steady or unsteady simulations, providing an easy way to reposition or replace objects in order to study multiple design configurations.