To transfer forces from a thin surface in CFX, you need to have a duplicate surface in Mechanical so that two surfaces exist in Mechanical Mechanicalto match the two surfaces in CFX.
Once you have two surfaces in Mechanical:
Use a bonded contact to connect the two surfaces in Mechanical.
Assign each surface half the true thickness of the thin surface.
Add an offset parameter to each of the Mechanical surfaces to ensure that the shell elements represents the true geometry. Typically, one surface uses offset = top and the second uses offset = bottom. Ensure that your elements are similar to those in the image below, where the mesh elements are not overlapping.
Create two fluid-solid interfaces in Mechanical, one for each surface body.
In this case, you cannot use a single set of shell elements in Mechanical.
Figure 5.19: Two Surfaces in Mechanical with the Correct Offset Parameter for Coupling with a Thin Surface
