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#1 |
New Member
Ron
Join Date: Dec 2016
Posts: 2
Rep Power: 0 ![]() |
Greetings FOAMers!
As the title suggests, I have some difficulties simulating an axisymmetrical free surface (liquid in gas) impinging jet. More specifically, with the outlet boundary conditions. I’m solving using interFoam. Issue 1: Currently, my jet flows along the x axis, hits the right wall and attempts to continue radially (y axis) towards the domain’s outlet. As the jet touches the boundary, the jet seems to view it as a “wall” (attached figure 1). I’ll note that up until the interaction with the outlet, it matches the literature. 0\p_rgh: Code:
dimensions [1 -1 -2 0 0 0 0]; internalField uniform 0; boundaryField { inlet { type zeroGradient; } outlet { type totalPressure; p0 uniform 0; } atmo { type totalPressure; p0 uniform 0; } walls { type fixedFluxPressure; } front { type wedge; } back { type wedge; } axis { type empty; } } Code:
dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { inlet { type uniformFixedValue; outOfBounds clamp; uniformValue table 2 ( (0.0 (0.00 0 0)) (0.00001 (1.667 0 0)) ); \\start-up condition\\ } outlet { type inletOutlet; inletValue uniform (0 0 0); value uniform (0 0 0); \\also tried here pressureInletOutletVelocity - same results\\ } atmo { type pressureInletOutletVelocity; value uniform (0 0 0); } walls { type noSlip; } front/back: wedge and axis: empty Code:
dimensions [0 0 0 0 0 0 0]; internalField uniform 0; boundaryField { walls { type zeroGradient; } inlet { type fixedValue; value uniform 1; } outlet {type inletOutlet; \\ also tried zeroGradient – continue reading:) inletValue uniform 0; value uniform 0; } atmo { type inletOutlet; inletValue uniform 0; value uniform 0; } front/back: wedge and axis: empty Code:
dimensions [0 1 -2 0 0 0 0]; value (9.81 0 0); Code:
phases (water air); water { transportModel Newtonian; nu [0 2 -1 0 0 0 0] 1e-06; rho [1 -3 0 0 0 0 0] 1000; } air { transportModel Newtonian; nu [0 2 -1 0 0 0 0] 1.48e-05; rho [1 -3 0 0 0 0 0] 1; } sigma [1 0 -2 0 0 0 0] 0.00; Issue 2: The case above imposed 0 surface tension. When inputting a realistic water/air surface tension (sigma=0.07), the jet merely thickens at the impingement point, without attempting to flow outside of the domain (attached figure 3). Thanks a lot for taking the time to read and think about my case, Ron |
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#2 |
New Member
Ron
Join Date: Dec 2016
Posts: 2
Rep Power: 0 ![]() |
So, I solved my first issue.
The problem was with the assumption that the outlet pressure is atmospheric (and well, equal to the other "free" surfaces of the domain). Zero Gradient in all three (pressure, velocity and void function) as an outlet condition seems to work quite well. Still working on the second one. Ron |
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Tags |
impingement, interfoam, jet, outlet boundary condition, two phase |
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