RT Journal Article ID 1f1811c47566d282 A1 Hayashi, Kosuke T1 INTERFACE TRACKING SIMULATION OF BUBBLES AND DROPS IN COMPLEX GEOMETRIES JF Multiphase Science and Technology JO MST YR 2007 FD 2007-08-01 VO 19 IS 2 SP 121 OP 140 AB The interface tracking method based on a nonuniform subcell scheme (NSS) and a level set function (LS) is applied to three-dimensional (3-D) general curvilinear and cylindrical coordinate systems. The method for 3-D general curvilinear coordinates is based on the combination of NSS, LS, a finite volume method, and a multiblock method. The method for cylindrical coordinates is based on the combination of NSS, LS, the variable transformation proposed by Verzicco and Orlandi (1996), and a simple method for evaluating surface tension force at the singular point r = 0. Simulations of single air and vapor bubbles in rod bundle geometry are carried out using the former method. Predicted bubble shapes and terminal velocities agree well with measured data and an available terminal velocity model. Bubbles and drops in pipes are simulated using the latter method. Terminal velocities of single drops confined in a pipe are well predicted. The bouncing motion of an air bubble in a laminar water flow in a vertical pipe is successfully simulated. Volumes of bubbles and drops are well conserved in all simulations. PB Begell House LK https://www.dl.begellhouse.com/journals/5af8c23d50e0a883,78939de429db8953,1f1811c47566d282.html