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Permeability of the flow now can be set at edges in the computational grids
In iRIC Version3, the setting for flow transparency was only possible at the cell level. Therefore, setting up a impermeable groynes required defining as obstacle cells. Consequently, the minimum thickness of the groynes depended on the grid size. For instance, in real river simulations with a grid size of around 10 meters, the thickness of the groynes also needed to be 10 meters. If a thinner groynes setting was desired, the grid size would need to be substantially reduced, leading to increased computational load.
In contrast, iRIC Version4 allows for the specification of the transparent condition at the edges of computational grids (or faces in 3D). As a result, it’s now possible to define the permiability condition at edges rather than cells, eliminating the dependence on grid size. This means there’s no longer a need to set up unrealistic thick groynes or extremely fine grids just to define thin transparent surfaces. This enhancement significantly improves computational efficiency.