ice attributes: terminal velocity, area, volume

[tluettm]

Adding terminal velocity of ice particles for sedimentation method:

• parameterizations of ice terminal velocity follows power-law relation, thus could be somewhat 'easily' incorporated into current version of terminal velocity backend using two sets of power series coefficients ( one for liquid droplets, one for ice particles)
• parameterization could be added to physics/terminal_velocity. No need to add new subfolder?
• refactor power_series of liquid droplet terminal into mass dependency instead of radius
• any more work to be done regarding relative fall momentum and relative fall velocity of ice particles?
• what to keep in mind now for future addition of ice-ice/droplet collisions?
• what if we add more complex forms of ice and/or shape prediction later?

area, volume:

• volume currently handled by mixed_phase_spheres in physics
• area currently handled in attributes/physics?
• refactor: should all attributes that concern the shape of the particle (area, volume, capacity for deposition, reynolds number and more...) be handled by particle_shape_and_density?
• creation of a new particle_shape_and_density type that adds the option to choose between different shapes (by choosing a parameterization type in formulae?)
• this does not only concern ice particles. Large liquid droplets (raindrops) are also no longer spherical!

[slayoo]

refactor: should all attributes that concern the shape of the particle (area, volume, capacity for deposition, reynolds number and more...) be handled by particle_shape_and_density?

Yes!

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