June 26, 2021 at 10:18 amfit78Subscriber
I'm working on fluid film on horizontal tube but the solution by using the 2nd order momentum resulted in the breaking of the film as shown in attached figure.
I tried to decrease relaxation factor of the momentum to 0.01 but to no avail.
I'm wondering if anyone has any suggestion to go about this.
I tried to stabilize the film by changing to k-e mid iteration and the film stabilized but didn't work when I changed back to laminar.
VOF implicit, laminar, SIMPLE,Body force weighted, compressive volume fraction, second order upwind momentum, the rest is first order.June 28, 2021 at 1:05 pmKarthik RAdministratorHello Firstly, what do you expect to see in this problem? I don't quite understand the problem you are trying to solve?
Before you change your discretization options, are you making sure that you are converging every single time step? I ask this question because the time-step chosen in your simulation, 0.2 s, seems a bit high for such problems. What is your CFL number? You might need to reduce this further.
June 28, 2021 at 1:26 pmfit78SubscriberHi I'm trying to reduce the film thickness based on some literatures of the same liquid load. I'm using implicit so the CFL number is not an issue I hope. I could get film thickness of within 40% of those in literature but I'm trying to reduce it by using second order momentum. Perhaps this is the limit of implicit solution.
June 28, 2021 at 2:30 pmKarthik RAdministratorIf you are comparing solutions with literature, I'd go the 'Explicit VOF' route and reduce the time-step to keep the CFL number close to 1.
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