Let's consider a cube in arbitrary dimensions 2x2x2. But once again, it's a coincidence, or better said a user-convenience. Obviously, if your solid model is also made in "m" (in the CAD, for example), you will have a "pseudo-true", automatically-set, MKS system. The "default to MKS" you say is a mere coincidence: it must be thought as having all the conversion parameters set to 1 (unity). It's the user which must ensure he inputs the values in a consistent system. There is no such thing as a "default" for the system of units used in the user's "simulation world". "The units label and conversion factors on this command are for user convenience only and have no effect on the analysis or data". Cited from the manual, from the explanation of "/UNITS" command: EMUNIT, PUNIT, EXUNIT), but they are not meant to physically represent true dimensions. Ansys provides some sets of correlation factors in particular sub-branches (e.g.
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