From the ANSYS manual entry for FLUID142:
The FLOTRAN element must be in counterclockwise order for a 2-D FSI analysis (for Figure 141.1: "FLUID141 Geometry", I, J, K, L order) and it must be in positive volume order for a 3-D FSI analysis (for Figure 142.1: "FLUID142 Geometry", I, J, K, L, M...