mscwu,
It depends on which boundary condition you need extracted and used in the optistruct analysis.
If it is pressure for instance, you can easily extract a txt file from acusolve results with the pressure value for each node, use HyperMesh linear interpolation option to use the same text file to apply pressures on the nodes while pre processing for Optistruct and you have hence coupled Acusolve and optistruct.
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