Maximilian
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Hi ZiwenZhang, I’ve looked into it and I can so far confirm that there is some error when executing the freeSurface examples on GPU. Running them on CPU gave me correct results.
You mentioned that the fallingDrop examples run correctly on your end. Can you tell me how the visualization of fallingDrop2d looked for you?
For me, the fallingDrop examples show movement of the liquid, but the behaviour is faulty: The liquid pool on the bottom ‘curls up’, when it is supposed to ‘splash’ to the sides.
Other examples such as rayleighInstability or breakingDam show no movement at all.
Maximilian
Hi James,
As far as I understand it, the contact angle and the categorization into strongly wetting, non-wetting, etc. is only relevant if we want to model the interaction between liquid, gas and a solid phase.
The current state of the freeSurface model focuses solely on the interaction between liquid and gas (including an interface layer between these two). The solids are not taken into account with the freeSurface model and are handled via standard boundary conditions.
On a first glance I didn’t find any sources that discuss the wetting / contact angle aspect in freeSurface. Do you happen to know any references or sources so we can look into it and potentially expand the freeSurface model in this direction?
Maximilian
Hello Wolfgang,
I’m very happy to hear that our most recent update has been helpful to you.
Regarding your question: Generally speaking, the mass exchange is used for the calculations of interface cells that are found between liquid and gas cells (see e.g. Thürey, Nils, C. Körner, and U. Rüde. “Interactive free surface fluids with the lattice Boltzmann method.” Technical Report05-4. University of Erlangen-Nuremberg, Germany (2005)).
The exact details, however, are too complex to elaborate on here: We are always open to the possibility of providing further support within a joint collaboration project.
I hope you all the best in your research.