My post-doctoral research is primarily focused on numerical simulations of airflow during inhalation/exhalation in the human/animal lung. I have developed three-dimensional numerical models of human and rat lungs based on CT-scan imaging measurements. I have developed C++ computer programs for implementation in FLUENT family software packages to evaluate fluid flow fields and particle transport and deposition patterns. In addition, I have simulated depositions of different particle sizes in the lungs using commercial and in-house codes; performed extensive analysis of the results and compared the findings against experimental data.