|
[Sponsors] |
![]() |
![]() |
#1 |
New Member
Dominik Regner
Join Date: Sep 2021
Posts: 3
Rep Power: 4 ![]() |
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. |
|
![]() |
![]() |
![]() |
![]() |
#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,492
Rep Power: 64 ![]() ![]() ![]() |
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. |
|
![]() |
![]() |
![]() |
![]() |
#3 |
Senior Member
Lorenzo Galieti
Join Date: Mar 2018
Posts: 350
Rep Power: 11 ![]() |
A ye, if you use the explicit solver you are bound by CFL criterions
|
|
![]() |
![]() |
![]() |
Tags |
bubble flow, fluent. convergence, vof multiphase |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Frictional Forces in Multiphase VOF Model? | kgschuch | FLUENT | 7 | May 13, 2020 07:14 |
VOF Multiphase can‘t get converget | yangpeisi | Fluent Multiphase | 0 | April 9, 2016 00:04 |
VOF multiphase - Validity of Fluent ? | manxu | FLUENT | 2 | January 2, 2014 11:17 |
Coupled VOF and Multiphase Segregated Flow for a gas bubble problem?? | EnronZhang | STAR-CCM+ | 1 | December 19, 2013 08:41 |
VOF transfer - multiphase flow | karthik | Main CFD Forum | 4 | February 2, 2006 01:25 |