The command descriptions say that OMEGA can be used in a mode-superposition harmonic or transient. Why
am I not seeing any effect in my ANSYS 8.0 analysis?
This is a documentation error. ACEL is the only acceleration recognized
in a mode-superposition harmonic or transient.
You can apply the OMEGA load in the modal and then use the LVSCALE command in the
mode-superposition pass as a workaround.