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September 10, 2021, 09:18
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Multiphase VOF Taylor bubbles
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#1 |
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New Member
Dominik Regner
Join Date: Sep 2021
Posts: 3
Rep Power: 5  |
I am trying to simulate sigle Taylor bubble in the microchannel (0.8mm height) Its 2D simulation of half of the channel.
Everything seems to work normal with sufficient results with lower mesh size. With settings: VOF Explicit P-V:PISO LeastSquares Cell Based PRESTO Second order upwind Georeconstruct. But with finer mesh (Same shape of cells) the solution starts to blow up. Bubble is collapsing. Is enyone able to help me? I need to have finer mesh but there is not any other change in solver settings...everything the same just better mesh and it always blows up. |
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September 10, 2021, 10:41
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#2 |
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Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,808
Rep Power: 68 |
Time step size...?
Are you already aware of the CFL condition? If all settings are the same (same time-step size) and you go to a finer mesh, it'll blow up. |
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September 10, 2021, 18:33
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#3 |
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Senior Member
Lorenzo Galieti
Join Date: Mar 2018
Posts: 375
Rep Power: 13 |
A ye, if you use the explicit solver you are bound by CFL criterions
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| Tags |
| bubble flow, fluent. convergence, vof multiphase |
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