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Reference is the System in which the nodal coordinates of your grids are written;
Displacement is the System in which the output (nodal displacement) are evaluated;
For OptiStruct the displacement system is thus the one w.r.t. which you are also constraining or enforcing a displacement using SPC or SPCD respectively.
Karthic,
For OptiStruct the displacement system is thus the one w.r.t. which you are also constraining or enforcing a displacement using SPC or SPCD respectively.
Hope this clarifies.
Thanks
Michele