The Import Mechanical CDB Surface feature is fully supported when initiated from the Mechanical side.
The main purpose of the Mechanical import/export facility in CFD-Post is to enable fluid-structure interaction (FSI). The facility enables a mapping of boundary data stored in a CFX results file to a surface stored in an Ansys Mesh (.cdb) file.
Note: In the volumetric transfer, the temperature at the unmapped nodes will be set to the average temperature of all mapped nodes.
For an example of using this option, see Mechanical Import/Export Commands.
The Import Mechanical CDB Surface dialog box has the following options:
The File setting specifies the filename
of the file to import. You can type the filepath of the file, or click
the Browse 
icon to search for the file to import.
Select the Specify Associated Boundary check box to specify an existing boundary to associate with the data in the *.cdb (Ansys mesh) file. When importing Ansys files, you should specify an associated existing boundary. If an export of Ansys data is subsequently performed using the locator from the Ansys file, data from the associated locator is mapped to, and exported with, the Ansys file locator.
Select the Maintain Conservative Heat Flows check box to ensure that the total heat flow for the boundary is equal to that of the imported Ansys surface.
Select the Read Mid-Side Nodes check box to map the Ansys classic geometry for side nodes to CFX geometry. Using this feature can greatly extend the time it takes to load a file as reading the mid-side nodes increases the number of nodes that need to be mapped. Mid-Side nodes are only useful when you perform nodal exports, like Nodal Temperature Export. The mapped mid-side nodes are not used for surface export data calculations.
The Mapping Success label indicates the percentage of the Ansys surface (.cdb) nodes that have been directly mapped to the CFX boundary surface.
The mapping success is determined in the following order:
An Ansys surface node is considered equivalent to the nearest boundary surface node if the node is within a certain tolerance of each other.
An Ansys surface node is mapped to the closest face if it is closer to a node than the closest edge.
An Ansys surface node is mapped to the closest edge if it is less than a certain tolerance.
Nodes are considered unmapped if none of the above conditions are met, or if the distance from the node to the closest edge is greater than the allowable tolerance. In this case the Ansys surface node is mapped to the nearest boundary surface node regardless of the distance.
Note: This label only appears in the corresponding User Surface panel, after the Ansys surface (.cdb) nodes that have been mapped to the CFX boundary surface.