FAST Blade Structure: Isotropic vs. Anisotropic material

I would like to ask two questions about the FAST wind turbine simulation code.

  1. Does the FAST assume that a blade structure is made of isotropic materials?
  2. Conventional blade structures are made of composite materials, which are anisotropic. If FAST assumes that the blade structure is made of an isotropic material, can this code be used to assess the structural integrity of a composite blade design?

Dear JinWoo,

Similar questions hae been discussed on the forum–see e.g. http://forums.nrel.gov/t/coupled-blade-modes-in-fast/314/1.

Best regards,