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interFoam: strange doplet behaviour at mesh transition |
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#1 |
Senior Member
Join Date: Dec 2019
Location: Cologne, Germany
Posts: 365
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i am trying to simulate droplets moving on a 2D-plane,
bc of geometry my cells transition at certain points, see pic1. right at the transition point, the lighter droplets are dragged down. compare pic 2 und 3, before and after photos. i draw a circle around one droplet to compare the two states. that happens to all droplets but smaller droplets are carried more aggressively. any help is appreciated. |
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#2 |
Senior Member
Join Date: Dec 2019
Location: Cologne, Germany
Posts: 365
Rep Power: 8 ![]() |
i tried various things already without success:
1. mesh refinement: i used the same meshing style but with much finer cells 2. changed meshing strategy completely with tet-mesh and unstructured hex mesh: there are droplets now that stay in place and don't move, they just wiggle around like the one in the 2 screenshots. |
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#3 |
Member
Anurag
Join Date: Feb 2023
Posts: 69
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i think due to momentum of the carrier fluid smaller droplets are affected more because they are lighter. Are the droplets moving inside a liquid?
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#4 |
Senior Member
Join Date: Dec 2019
Location: Cologne, Germany
Posts: 365
Rep Power: 8 ![]() |
i played around with the numerics and solved it.
of course the carrier fluid has an impact, but the mesh transition and standard numerics lead to that unphysical flow behaviour. |
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