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On finite element modelling of surface tension: Variational formulation and applications – Part II: Dynamic problems

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Abstract

In Part I, a finite element model of surface tension has been discussed and used to solve some quasi-static problems. The quasi-static analysis is often required to find not only the initial shape of the liquid but also the static equilibrium state of a liquid body before a dynamic analysis can be carried out. In general, natural and industrial processes in which surface tension force is dominant are of dynamic nature. In this second part of this work, the dynamic effects will be included in the finite element model described in Part I.

A fully Lagrangian finite element method is used to solve the free surface flow problem and Newtonian constitutive equations describing the fluid behaviour are approximated over a finite time interval. As a result the momentum equations are function of nodal position instead of velocities. The resulting ordinary differential equation is integrated using Newmark algorithm. To avoid overly distorted elements an adaptive remeshing strategy is adopted. The adaptive strategy employs a remeshing indicator based on viscous dissipation functional and incorporates an appropriate transfer operator.

The validation of the model is performed by comparing the finite element solutions to available analytical solutions of a droplet oscillations and experimental results pertaining to stretching of a liquid bridge.

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  1. Civil and Computational Engineering Centre, School of Engineering, University ofWales Swansea, Swansea, SA2 8PP, U.K

    P. H. Saksono & D. Perić

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  1. P. H. Saksono
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  2. D. Perić
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Correspondence to D. Perić.

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Saksono, P., Perić, D. On finite element modelling of surface tension: Variational formulation and applications – Part II: Dynamic problems. Comput Mech 38, 251–263 (2006). https://doi.org/10.1007/s00466-005-0745-7

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