After you create nCloth and other Nucleus objects , you can assign them to a new solver, or a different existing solver within your scene. Because Nucleus objects can only interact with each other when sharing the same Maya Nucleus solver, you may want to move objects from one solver to another or separate objects to their own solver.
To assign your nCloth or passive object to a new or existing solver
A list of solvers appears.
If you select New Solver, Maya creates a new Maya Nucleus Solver, which appears in the Attribute Editor, and assigns the selected object(s) to it.
If you select an existing solver, Maya assigns the selected object(s) to it.