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Calculating Surface Tension
Posted Apr 9, 2020, 11:31 p.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD) Version 5.4 1 Reply
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Hello,
I am having an issue with calculating surface tension in two-phase level set method in 2D axisymmetric section. I have a spherical droplet and I want to calculate the surface tension (in units of Force/length). The force reported by results section is a volumetric force [N/m3]. I have tried the following so far: 1- calculated total force by surface integration (it's basically a volumetric integration as it is in 2D axisymmetric) over the entire domain. Then I divide the total force by perimeter of the projected circle and surprisngly it give me an answer with a factor of 4! So I have to divide it again by 4 to get the correct result. Wondering whai am I missing.
I appreciate your comments.
Best,
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Resolved by dividing the total force by sphere area 4 pi r2 and this equals the Laplace pressure 2*gamma/r which then rearrenging gives gamma=F/4piD