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Research Article | Open Access

On sharp surface force model: Effect of sharpening coefficient

Kurian J. Vachaparambil( ), Kristian Etienne Einarsrud
Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
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Abstract

Amongst the multitude of approaches available in literature to reduce spurious velocities in Volume of Fluid approach, the Sharp Surface Force (SSF) model is increasingly being used due to its relative ease to implement. The SSF approach relies on a user-defined parameter, the sharpening coefficient, which determines the extent of the smeared nature of interface used to determine the surface tension force. In this paper, we use the SSF model implemented in OpenFOAM® to investigate the effect of this sharpening coefficient on spurious velocities and accuracy of dynamic, i.e., capillary rise, and static bubble simulations. Results show that increasing the sharpening coefficient generally reduces the spurious velocities in both static and dynamic cases. Although static millimeter sized bubbles were simulated with the whole range of sharpening coefficients, sub-millimeter sized bubbles show nonphysical behavior for values larger than 0.3. The accuracy of the capillary rise simulations has been observed to change non-linearly with the sharpening coefficient. This work illustrates the importance of using an optimized value of the sharpening coefficient with respect to spurious velocities and accuracy of the simulation.

Keywords

OpenFOAM®spurious velocitiestwo-phase flowsVolume of Fluid

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Experimental and Computational Multiphase Flow
Volume 3 Issue 3,
September 2021
Pages 226-232
DOI: 10.1007/s42757-020-0063-5
Cite this article:
Vachaparambil KJ, Einarsrud KE. On sharp surface force model: Effect of sharpening coefficient. Experimental and Computational Multiphase Flow, 2021, 3(3): 226-232. https://doi.org/10.1007/s42757-020-0063-5

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Received: 06 January 2020
Revised: 06 March 2020
Accepted: 07 March 2020
Published: 16 June 2020
© The Author(s) 2020

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