Hello!, Next verion of NX NASTRAN V9.0 will feature a new nx nastran "native" advanced nonlinear solution sequence named SOL401, I am not sure if the initial release will support surface-to-surface contact, but will be the architecture for future extensions, very exciting!!. Alternatives: SOL106 with CGAP node-to-node contact, and learn to mesh correctly. Best regards, Blas.
Hello!, This will be imposible, SOL101 is LINEAR static, and SOL601 IS NONLINEAR, the solution will be the same if the model to solve is LINEAR by nature, then both solvers will arrive to the same results. I guess you are referring to SOL401 .... Best regards, Blas.