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what's happening in constantcontactangle interFoam model |
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#1 |
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Josh McCraney
Join Date: Jun 2018
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A VOF solver for contact-line problems typically need a model of fluid slip at the contact-line. Do you know how this is handled in interFoam for the constantAlphaContactAngle case?
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#2 |
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Michael Alletto
Join Date: Jun 2018
Location: Bremen
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What one does is effectively prescribing the gradient of alpha accordingly to the contact angle. I think the topic is also discussed in this forum
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#3 |
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Josh McCraney
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Thanks for the reply. I perused the threads and searched for contact angle, but couldn't find any elaboration of what you said. Can you direct me further?
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#4 |
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Michael Alletto
Join Date: Jun 2018
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Here e.g. InterFoam contact angle
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#5 |
Senior Member
Josh McCraney
Join Date: Jun 2018
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Thanks so much, that thread was very helpful. One last question: how is the stress singularity at the contact line overcome/subverted?
Specifically, in finite-element numerical simulations the contact line stress singularity is easily handled by imposing a slip boundary condition (with its associated slip length) at the solid. This allows the computation to converge with grid size refinement. But how is this issue is resolved in VOF. I assume that VOF introduces an ad-hoc thickness to the interface, which eliminates the singularity that appears in "zero-thickness" interface approaches. But I wonder how to make the stress calculated with VOF all the way to the contact line converge with grid refinement. |
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#6 |
Senior Member
Michael Alletto
Join Date: Jun 2018
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Actually one does not have any singularity in the stresses resulting from a small curvature radius. The streamline deviding the two phases is not resolved explicitly in VOF. By the way modelling surface tension in VOF is still an open issue since representing the curvature is not so trivial. See e.g. https://arxiv.org/abs/2103.00870
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#7 | |
Senior Member
Josh McCraney
Join Date: Jun 2018
Posts: 220
Rep Power: 9 ![]() |
Quote:
Josh McCraney |
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#8 | |
Senior Member
Josh McCraney
Join Date: Jun 2018
Posts: 220
Rep Power: 9 ![]() |
Quote:
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Tags |
contact angle, contact line |
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