May 12, 2022 at 1:46 pmi.tamunodienye2Subscriber
I am a bit worried about my observation regarding my simulation.
The mixture does not go around the first bend in large mass. This really worries me. See attached.May 12, 2022 at 1:55 pmRobAnsys EmployeeWhat is the inlet condition? The result looks relatively sensible, albeit I think you're losing liquid mass. 2d or 3d?
May 12, 2022 at 2:20 pmi.tamunodienye2SubscriberMay 12, 2022 at 2:37 pmMay 12, 2022 at 2:39 pmMay 12, 2022 at 3:24 pmRobAnsys EmployeeVOF?
Check for mass in, mass out & mass in the domain. As the air is compressible are you just squashing that at present? You may want to have a look at a Baker Chart and see what regime you're in.
May 12, 2022 at 3:26 pmi.tamunodienye2SubscriberYes, VOF
May 12, 2022 at 3:26 pmRobAnsys EmployeeOK, and how's the cell aspect ratio in the domain?
May 12, 2022 at 3:33 pmMay 12, 2022 at 3:38 pmRobAnsys EmployeeThat'll not help - you really want an aspect ratio in the 2-3 range as the flow is changing along the length of the cells with VOF: ie the free surface is moving axially.
May 12, 2022 at 3:40 pmi.tamunodienye2SubscriberThe Baker Chart is for horizontal flow regime case. My case is for a vertical flow regime at the first vertical pipe only. Also my pipe internal diameter is 0.21m
May 12, 2022 at 3:45 pmi.tamunodienye2SubscriberDo you mean aspect ratio should be reduced to 2 - 3 in the meshing process (ICEM CFD).
In essence i should increase the grid size?
May 12, 2022 at 3:46 pmRobAnsys EmployeeIncrease the cell count and decrease the cell size.
May 12, 2022 at 4:14 pmMay 13, 2022 at 10:01 amRobAnsys EmployeeIt's a general recommendation. Don't get too hung up on the near wall y+ as unless you're also resolving the axial flow the results won't be much use.
May 13, 2022 at 11:06 amMay 13, 2022 at 12:39 pmRobAnsys EmployeeThe graph shows the range of cell values, what you need to look at is where these occur. If the solution is changing along the length of the cell then you need to have a low aspect ratio.
May 27, 2022 at 8:48 ami.tamunodienye2SubscriberViewing 17 reply threads
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