Fig. 7
Grid independence and validation of CFD accuracy. a The meshes of one tracheobronchial tree model as an example. b Trachea cross section CS1 and bronchus cross section CS2. c Velocity profile along Y at CS1. d The velocity simulated by CFD and the results of MR gas velocity measurement at the section CS2 along X. e The velocity simulated by CFD and the results of MR gas velocity measurement at the section CS2 along Y. f The lobar distribution of airflow rate (RU right upper, RM right middle, RL right lower, LU left upper, LL left lower)