DPM axisymmetric problem to model bubble plume

Hi!

I want to model a gas jet in water and the consequent bubble plume rising to water surface.

I decided to start with a simpler case, a steady dpm case where the discrete phase is the gas, so my particles are bubbles.

I'm asking for some help because the bubble diameter I need to use is 3 mm and since I need to enable lift force model on bubbles the solution I get is not realistic.

The problem is that some particles go through the axis boundary and I can't explain why, even if the residuals are good. This problem is present only if Saffman's lift is enabled.

I know Saffman's lift is for submicron particles so my question is how to model lift with big particles and if is possible to use dpm for bubbles that are not solid particles.

Any kind of advice is useful to me!

Thanks in advance.

Lorenzo

Best Answer

  • RobRob UKPosts: 10,331Forum Coordinator
    Accepted Answer

    I'm not sure how anything can go through the axis as it's supposed to act as a reflecting boundary for DPM. DPM considers a point mass of another phase, so this can be particles, droplets or bubbles (and combinations of those in some cases). You shouldn't need to activate lift force, gravity (buoyant forces) ought to be sufficient. Read the documentation re DPM diameter and volume fraction.

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