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11.1 Introduction

In sliding meshes, the relative motion of stationary and rotating components in a rotating machine will give rise to unsteady interactions. These interactions are illustrated in Figure  11.1.1, and generally classified as follows:

Where the multiple reference frame (MRF) and mixing plane (MP) models, discussed in Chapter  10, are models that are applied to steady-state cases, thus neglecting unsteady interactions, the sliding mesh model cannot neglect unsteady interactions. The sliding mesh model accounts for the relative motion of stationary and rotating components.

Figure 11.1.1: Illustration of Unsteady Interactions

The dynamic mesh model uses the FLUENT solver to move boundaries and/or objects, and to adjust the mesh accordingly. The dynamic mesh model is used when boundaries move rigidly (linear or rotating) with respect to each other. For example

The dynamic mesh model can also be used when boundaries deform or deflect. For example

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