- **OpenFOAM**
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- - **inkjet model using interFoam**
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inkjet model using interFoamDear Foamers,
I am trying to simulate the inkjet problem from a nozzle. I am using the interFoam solver to model the same. The geometry is similar to the one discussed in this tutorial http://www.tfd.chalmers.se/~hani/kur...Hemida_VOF.pdf However, I was not able to get the correct results as discussed in the tutorial. I would like to know what boundary conditions have to be specified for pressure and the velocity. I have considered the following for U internalField uniform (0 0 0); boundaryField { inlet { type fixedValue; value uniform (-0.1 0 0); // water is injected at 0.1m/s } inletWall { type fixedValue; value uniform (0 0 0); } bottleWall { type fixedValue; value uniform (0 0 0); } atmosphere { type pressureInletOutletVelocity; value uniform (0 0 0); } frontAndBack { type empty; } } and for pressure boundaryField { inlet { type buoyantPressure; value uniform 0; } inletWall { type zeroGradient; } bottleWall { type zeroGradient; } atmosphere { type totalPressure; p0 uniform 0; U U; phi phi; rho rho; psi none; gamma 1; value uniform 0; } frontAndBack { type empty; } } while for alpha1 boundaryField { inlet { type fixedValue; value uniform 1; } inletWall { type zeroGradient; } bottleWall { type zeroGradient; } atmosphere { type inletOutlet; inletValue uniform 0; value uniform 0; } frontAndBack { type empty; } I would like to know if they are consistent. Kindly let me know !! Thanks Regards Vishal |

I think there is the same problem with simulation of inkjet breakup due to external oscillations.
The formulation of a problem is very simple (see http://www.foamcfd.org/Nabla/main/mainhe22.html#inkJet for example): there is a water axisymmetric jet (about 100mkm diameter) with oscillating speed U0+dU*sin(Wt), U0 is about 25 m/s, dU is about 1-10%U0, W is about 1-100kHz. It should breaks up to droplets but for interFoam 2.0 and 2.1 it does not. With OpenFoam 1.5 all is fine and is in excellent agreement with the experiment. Sometimes later I hope to post problem formulation for OpenFOAM. I think there is a serious bug in interFoam. P.S. This is our article about results obtained with interFoam 1.5 http://www.sciencedirect.com/science...77050910000785 |

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