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How to model thin-walled beam/structures in MSC Patran.

I want to calculate shear flows in wing box which requires modelling thin-walled structures. I have tried to model thin-walled beam using 2D shell elements but it didn't give the desired results (as expected).
 
I want to know if:
  • MSC PATRAN supports modelling of thin-walled structures
  • MSC NASTRAN has capability to solve for thin walled structures