homogeneous nucleation of droplets & expansion chamber examples (Clare's branch)

[slayoo]

No description provided.

[AgnieszkaZaba]

We could add here the seeding dynamic (after renaming it as injection?). Inside the seeding dynamic, the super-droplet injection rate function would need to receive additional argument: an environment instance which can be queried for T and S with env[T].

[AgnieszkaZaba]

Which paper? :)

[claresinger]

https://arxiv.org/abs/2501.01467

[AgnieszkaZaba]

the unit tests have not been yet committed

[slayoo]

Perhaps we could also add a hello-world example (or a tests) referring to the "Clouds in a glass of beer" book:

:)

[slayoo]

Thank you @claresinger and @AgnieszkaZaba for today's discussion. Here's a record of the points we mentioned:

• the arXiv paper uses a Normal distribution rather than Lognormal - perhaps worth adding to PySDM
• a new ExpansionChamber environment (featuring perfect gas expansion, but not featuring hydrostatics) instead of using Parcel would help in making the code readable
• an Injection (or differently named) base-class could be best to derive from two dynamics: Seeding and HomogeneousNucleation
• could we construct a simple adaptive substepping logic by comparing the nucleation rate and the timestep?
• test idea: J_homogeneous table from S&P
• test idea: long vs. short timestep
• test idea: S_max for short vs. long timestep

[claresinger]

Thank you @slayoo and @AgnieszkaZaba!

• an Injection (or differently named) base-class could be best to derive from two dynamics: Seeding and HomogeneousNucleation

Would NewParticleFormation be a good name? This is the phrasing used to describe homogeneous nucleation of other species (not water) to form aerosol in the atmosphere. Or maybe something like ParticleCreation or SuperParticleFormation?

[slayoo]

@claresinger, thank you for the new test!
Since it was me who opened the PR, we do not have write access to your branch that is associated with this PR (just tried pushing a commit with the pdoc CI sorted out). Could you please open a new PR from the same branch?

[claresinger]

closing to open a new PR (so that the editing privileges transfer properly, since it is my branch)

[claresinger]

See #1492