Hello Caleb,
The commands you may try are (a) *DATABASE_FSI or (b) *DATABASE_FSI_SENSOR. Pls give that a try.
(a) can output an "estimated" coupling P averaged over a LAG surface entity - there is no exactly correct value for this because we do not have a "physical law" to guide us. The interaction P are only local, estimated, and instantaneous.
(b) can output the elm P in an ALE elm (fluid/mat)
Ian Do