If this is an industrial sized wind turbine blade, it sounds like perhaps the cut-off trailing edge is resembling a sharp knife-edge. Some possible workarounds:
-Turn off the "Cut-off or Square" trailing edge definition in TurboGrid. Using a different topology for the trailing edge may avoid the error
-Try scaling up the geometry in DesignModeler by a reasonable value such that the mesh generates in TurboGrid. Scale the mesh back down in CFX-Pre.
-Modify the geometry in DesignModeler to avoid this knife edge (if that's what's causing the issue). Dimensions that small for such a large geometry aren't realistic
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