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May 9, 2021, 12:04 |
VOF simulation in FLUENT
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#1 |
New Member
Alex
Join Date: Dec 2020
Posts: 15
Rep Power: 6 |
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 |
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Tags |
fluent, implicit method, non newtonian power law, vof |
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