A Generalized, Unstructured Interpolative Interface Method for Rotor-Stator Interactions

A generalized interpolative interface is developed to provide interdomain and intradomain coupling between multielement unstructured grids, including those that require highly stretched anisotropic meshes. The method centers around an extruded interpolative interface that does not require matched unstructured grids on the corresponding surfaces. In the context of rotor/stator interactions, this generalized interpolative interface is utilized between the rotor and stator sections, so that each can be solved within its own frame of reference. The interpolative interface supports the sliding of the rotor relative to the stator, such that variables are transmitted from one domain to the other accordingly. Coupling between the rotor and stator sections is accomplished via solution interpolations from mesh extrusions constructed from the interpolative interface. Further, the same interpolative interface technology is utilized to implement an axisymmetric boundary condition that also does not require matching surface grids on the periodic surfaces. Given that these axisymmetric boundary conditions intersect with the rotor/stator interface, special consideration is required in these areas, and the techniques applied are explained in this work in detail. This interpolative interface scheme is tested and applied via a performance mapping of the SDT2-R4 rotor/stator configuration as documented in Hughes, 1 simulated as a 2 rotor/5 stator passage. Results for this configuration are compared to available experimental data as well as full-wheel simulations of the same, in order to determine the eect of the axisymmetric interfaces on the overall solution. Overall agreement with experimental performance mappings is excellent.

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