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The most complex section of the geometry is nasal concha or turbinates that occupy most of the cavity. These bones are long finger-like shelves in the nasal passage, extending from the top of the exterior nose to the nasopharynx. There are three sets of concha, inferior, middle and superior. Viewing the skull from the coronal plane, like you are facing the patient, shows that these concha are actually curved. These concha serve to distribute the incoming air and also warm and moisten the air before entering the lungs. Additionally there are four sets of sinuses around nasal cavity, which for this study will be removed from the geometry. The entrance of the sinuses into the nasal cavity is relatively small and does not impact the flow in cavity to any great extent.
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http://www.teachmeanatomy.com/wp-content/uploads/2012/12/Conchae-and-Meatuses.png

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