Stallion 3D is a unique MS Windows software that simplifies this task by importing a CAD model that represents the geometry of interest and then automatically perform the necessary computing to generate the aerodynamics information.
Stallion 3D uses an novel formulation of the immersed boundary method, IBM, (based on a 3D Cartesian grid) to automatically detect immersed geometries and perform grid refinement at the boundaries. Hanley's original ghost-cells based boundary scheme is automatic and can even work with near-zero-thickness surfaces to model sails and other aerodynamic structures.
The following video shows how to input the full 3D aircraft for analysis in Stallion 3D. Given a .stl (from NASA VSP, for example) the setup time is about one minute. Please click the following link to view the video:
BTW, here are a few recent pictures from Stallion 3D. In some images, the geometries are from TurboSquid.com. Other geometries were created using Stallion's built-in wing editor.
Meteor at Mach 10. Picture shows the temperature field.
Cartesian grid for joined-wing (box wing) model.
Sailboat simulation demostrating the ability to analyze thin surfaces.
Building and trees in the wind (steady flow).
Thanks for reading and best regards.