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.
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05 February 2022
A Correction to this paper has been published: https://doi.org/10.1007/s42757-022-0132-z
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Acknowledgements
This work was funded by the Department of Materials Science and Engineering at Norwegian University of Science and Technology (NTNU). The authors would also like to thank NTNU HPC and UNINETT Sigma2 for providing necessary computational resources through grant NN9741K. This paper is an extension of the poster, Vachaparambil and Einarsrud (2019b), which was presented at the 17th Multiphase Flow Conference & Short Course and subsequently invited for publication at this journal.
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Open access funding provided by NTNU Norwegian University of Science and Technology (incl St. Olavs Hospital - Trondheim University Hospital).
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Vachaparambil, K.J., Einarsrud, K.E. On sharp surface force model: Effect of sharpening coefficient. Exp. Comput. Multiph. Flow 3, 226–232 (2021). https://doi.org/10.1007/s42757-020-0063-5
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DOI: https://doi.org/10.1007/s42757-020-0063-5