Learning Forum

[barteo]

Hello,

I am trying to simulate a bottle with a hand pump from which glycerin is being discharged. I wanted to model this using the "axisymmetric model". However, the axisymmetric option never worked for me. I checked my mesh, tried a variety of meshes with different skewness, orthogonality, etc. I have also made sure that my symmetry axis is on the x-axis, but the result was always the same.  The simulation crashes even before the first iteration and I am getting the following error (note that when I use planar model, everything works perfectly):

-----------------------------

Global Courant Number [Explicit VOF Criteria] : 0.16369

 done.

 iter continuity x-velocity y-velocity  time/iter

    Stabilizing x-momentum to enhance linear solver robustness.

    Stabilizing x-momentum using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: x-momentum    Stabilizing y-momentum to enhance linear solver robustness.

    Stabilizing y-momentum using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: y-momentum    Stabilizing pressure correction to enhance linear solver robustness.

    Stabilizing pressure correction using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: pressure correction    Stabilizing pressure correction to enhance linear solver robustness.

    Stabilizing pressure correction using GMRES to enhance linear solver robustness.

Divergence detected in AMG solver: pressure correction

Error at host: floating point exception

-------------------------------

The details of my model are as follows:

-Transient, pressure-based, axisymmetric

-VoF - glycerin and air

-Boundary conditions: 

       -inlet: velocity inlet 0.243 mm/sec

       -outlet: pressure outlet 0 gauge pressure

       -wall-slip boundary conditions everywhere else

Methods: PISO

Controls: Pressure-0.3, density-1, body forces-1, momentum-07

Residuals: 0.001

Initialization: standard - glycerin volume fraction:1

Calculations: Adaptive - Time step size 0.00001, 20000 time steps, 20 iterations/time-step

[Rob]

Can you go to the Scale panel (First tab) and post the results?

[barteo]

Hello Rob Here is the scale panel:

Please help me! Thank you!

[Rob]

Can you post some images of the mesh and 2d results? Are you running in double precision?