dear all, I am relativley new to CFD, and am trying to model the flow through the Larynx and Trachea in the throat. Can anyone give me any modelling ideas, especially cocerning the walls of the Trachea.

As a start, try these references:

Computational Flow and Aerosol Concentration Profiles in Lung Bifurcations. Kinsara, Tompson, Loyalka. 1993. Health Physics Society, Vol. 64, No.1, pg. 13-22

Application of Computational Fluid Dynamics to Regional Dosimetry of Inhaled Chemicals in the Upper Respiratory Tract of the Rat. 1993. Toxicology and Applied Pharmacology, Vol. 121, pg. 253-263.

And don't forget to read books by Anderson, Peric, and the like...