Bubble nucleation on nano-to micro-size cavities and posts: An experimental validation of classical theory J. Appl. Phys. 112, 064904 (2012) Bubble oscillations and motion under vibration Phys. Fluids 24, 091108 (2012) Single file and normal dual mode diffusion in highly confined hard sphere mixtures under flow J. Chem. Phys. 137, 104501 (2012) Response theory for confined systems J. Chem. Phys. 137, 074114 (2012) Finite Rossby radius effects on vortex motion near a gap Phys. Fluids 24, 066601 (2012) Additional information on Phys. Fluids A

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The mean streak spacing of approximately 100 wall units that is observed in wall-bounded turbulent shear flow is shown to be consistent with near-wall streamwise vortices optimally configured to gain the most energy over an appropriate turbulent eddy turnover time. The streak spacing arising from the optimal perturbation increases with distance from the wall and is nearly independent of Reynolds number, in agreement with experiment.

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SUMMARYA new computational procedure for analysis of the melting and flame spread of polymers under fire conditions is presented. The method, termed particle finite element method (PFEM), combines concepts from particle-based techniques with those of the standard finite element method (FEM). The key feature of the PFEM is the use of an updated Lagrangian description to model the motion of nodes (particles) in the thermoplastic material. Nodes are viewed as material points that can freely move and even separate from the main analysis domain representing, for instance, the effect of melting and dripping of polymer particles. A mesh connects the nodes defining the discretized domain where the governing equations are solved as in the standard FEM. An incremental iterative scheme for the solution of the non-linear transient-coupled thermal-flow problem, including loss of mass by gasification, is used. Examples of the possibilities of the PFEM for the modeling and simulation of the melting and flame spread of polymers under different fire conditions are described. Numerical results are compared with experimental data provided by NIST.