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VOF simulation in FLUENT

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Old   May 9, 2021, 11:04
Default VOF simulation in FLUENT
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Alex
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Hi everyone,
I'm trying to perform a VOF 2D analysis in Fluent, but I found some problems; my simulation is not converging. I'm trying to simulate the deposition of a material (ABS) on a moving plate; the other phase is air at constant density & viscosity.
The simulation gives no problem until the red fluid (ABS, in file attach-1) is still moving towards the bottom edge in the domain. Here there's the moving wall and simulation does not converge.
Simulation is performed by mean of Implicit solver; max. Courant number of 0.4; variable time step width (also, same problem if I use a lower courant number and a lower time step); interface anti-diffusion and implicit formulation for body force terms.
Under-relaxation factors are half the default values.
I am attaching some screens in order to be more clear.
Boundary conditions are:
-inlet of ABS phase from the upper edge (non-newtonian power-law)
-wall (no slip) on the two side edges of the vertical region (filled with red phase in attach-1 file)
-wall (with no slip and moving at 0.02[m/s] in horizontal direction); this is the bottom edge in the domain
-pressure outlet: all remaining edges (the problem is the same if I use Outflow boundary condition)
The same problem, obviously, appears when I perform 3D simulation; because of the great amount of computational effort requested by 3D, I turned to 2D, finding the same problem.
I will appreciate your help in finding a possible solution to this problem,
Kerouac
Attached Images
File Type: png attach_1_solution.png (40.5 KB, 13 views)
File Type: png attach_2_VOF_settings.png (55.5 KB, 9 views)
File Type: jpg attach_3_material.jpg (77.2 KB, 5 views)
File Type: png attach_4_discretization.png (29.0 KB, 5 views)
File Type: png attach_5_initialization.png (10.1 KB, 7 views)
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fluent, implicit method, non newtonian power law, vof


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