Added mass

About: Added mass is a research topic. Over the lifetime, 2849 publications have been published within this topic receiving 47899 citations.

Parametric study of ship-hull vibrations

Abstract: A parametric study carried out to investigate the vertical free vibrations of a ship hull is described. The analysis takes into account all the effects of the rotary inertia of mass, shear distortion, thrust force, shear lag and various damping components. The influence of these parameters on ship hull vibrations is explained. Special emphasis is placed upon a method for calculating the overall damping ratios.

Computational modeling of a dilute turbulent liquid‐solid flow using a Eulerian‐Lagrangian approach

Abstract: Numerical results are reported for a dilute turbulent liquid‐solid flow in an axisymmetric sudden‐expansion pipe with an expansion ratio 2:1. The two‐phase flow has a mass‐loading ratio low enough for particle collision to be negligible. The numerical predictions for the dilute two‐phase flow are based on a hybrid Eulerian‐Lagrangian model. A nonlinear k‐e model is used for the fluid flow to account for the turbulence anisotropy and an improved eddy‐interaction model is used for the particulate flow to account for the effects of turbulence anisotropy, turbulence inhomogeneity, particle drift, and particle inertia on particle dispersion. The effects of the coupling sources, the added mass, the lift force and the shear stress on two‐phase flow predictions are separately studied. The numerical predictions obtained with the improved and conventional particle dispersion models are compared with experimental measurements for the mean and fluctuating velocities at the different measured planes.

Mesoscale Flow Structures and Fluid–Particle Interactions

Abstract: During the last two decades, the insight has gradually grown—thanks to advances in both experimental techniques and computational simulation tools—that many dispersed two-phase flows are dominated by dynamic mesoscale coherent structures in which particles, bubbles, or drops organize themselves. Evidence from experiments, hydrodynamic analyses, and computational simulations on the presence and dynamics of such structures, strands, and clusters is presented. Their origin being less well understood, the general consensus is that fluid–particle interaction forces play a dominant role in bringing and keeping the dispersed-phase particles together. This chapter then revisits the topic of the fluid–particle interaction in all of its aspects and constituents such as single-particle steady-state drag, added mass, Basset force, lift, and particle rotation, while also the effects of particle and fluid acceleration and carrier phase turbulence are reviewed. The common practice of linearly adding the various correlations obtained for very specific canonical cases is to be rejected for other flow conditions than just creeping flow. Particular attention is paid to the way the pertinent fluid–particle interaction correlations are utilized in computational simulations of both the Euler–Lagrange (point-particle tracking) and Euler–Euler (two-fluid) type, where a distinction is made between Reynolds-averaged Navier–Stokes-based simulations and large-eddy simulations. Tracking a particle immersed in a 3D turbulent fluid in the presence of other particles by means of the steady-state drag force is a dubious approach. Undoubtedly, the best representation of the fluid–particle interaction can be obtained from periodic-box direct numerical simulations.