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The stenosis inside trachea windpipe has three dominant factors; locations of stenosis, degree of stenosis and types of stenosis (Freitag et al., 2007). Each factor will give the significant impact to the airflow motion and increase the level of disease. Almost every asthmatic patient had suffered different dominant factors of stenosis. The signs and symptoms of disease are also dissimilar. Thus, the requirement of airflow analysis is very important to understand the early signs in order to predict the risk in the future.

Mitral Valve failure causes death if it is not corrected surgically. Such surgical repair can be improved by understanding mitral biomechanics. A two-dimensional FSI model of the Mitral Valve was generated using the ADINA simulation. A simple approximation of the heart geometry was use, the valve dimensions were based on measurements made. The viscosity of blood and the elastic properties of the valve leaflets were obtained from the literature. In this book, numerical modeling was used to determine the correlation between the degeneration of the Mitral Valves rigidity and backflow problem...