Using VOF ith a laminar model, I'm simulating collision of a droplet and a spherical particle. The particle moves very fast (~7 m/s) and so penetrates into the falling droplet and deforms it to a thin liquid film (i.e. a lamella). Please see the attached picture for an overview of the process. Does anyone know what I need to do in Fluent to calculate the "viscous dissipation" takes place in the liquid phase during deformation (i.e from the impact moment until lamella detachment from the particle)?
Thank you!
First: keep very good control over your numerical dissipation, since that is almost indiscernible from the computed viscous dissipation. Second, realize that most CFD codes do not inherently conserve energy (which is probably related to the first point). Then, I would probably turn on the energy equation and integrate the (probably small) temperature increase, since that should be directly related to the viscous dissipation.
Thanks for replying.
If there is a way by which I can have access to velocity field only inside the lamella (i.e. within the liquid phase only), then I can probably use the 'calculator device' in Fluent to calculate the velocity derivative to have phi function and then use the attached formula to calculate the energy dissipation. Do you know any way to work only with the velocity inside the lamella?
(see the attached picture please)
The best way is using UDF to calculate/store it each time step or using Custom Field Functions
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