If the source and target blades do not have consistent orientation in space, you can align the geometries by applying rigid body translation and rotation in the co-simulation setup.

For more information, see Defining Geometry Transformations for Models with Different Orientations.

In some cases, the number of blade passages for the modal analysis is different from that for the CFD analysis. In such situations, you can use instancing to make the modal analysis and CFD analysis setup consistent.

For more information, see Defining Interface Instancing for Cylindrical Geometry Models.

Source and target meshes may not overlap perfectly due to missing geometric features on either participant or other inconsistencies. In this case, setting the data transfer's UnmappedValueOption setting to Extrapolation may help to fill the unmapped target nodes with physically realistic data profile.

For more information, see Improving Mapping Quality in this guide and UnmappedValueOption in the System Coupling Settings and Commands Reference documentation.