N-Sim (Nested Simulation) technology allows users to simulate multiple overlapping grids simultaneuosly. In certain situations this is a great time saver solution as it allows user to create several smaller grids instead of one large grid, thus saving simulation time and computer memory.

In the example below, N-Sim with three grids uses at least 20% less memory compared to one large grid.

N-Sim interaction between three FumeFX grids