Regarding modeling issues

[Moxing529]

Hello, Dr. Karnakov!
the current modeling method seems to only allow for the assembly of regular shapes. Could you suggest any methods for more complex modeling?

[Moxing529]

Does the sphere primitive or other similar operations in modeling have the capability to create a semicircle? Also, in 205/crystal, does vfoam refer to the average flow velocity of bubbles after entering the main channel? If I use a pressure inlet, how will adjusting the vfoam parameter affect the flow velocity, bubble size, and other factors?Thank you！

[pkarnakov]

Here's an example for using polygons (not sure if it's still working)
https://github.com/cselab/aphros/blob/master/examples/200_primlist/case/polygon

Also examples here (in particular "Tesla valve" and "Pipe")
https://github.com/cselab/aphros/wiki/Aphros-Explorer

Does the sphere primitive or other similar operations in modeling have the capability to create a semicircle?

so to make a semicircle I'd create a circle ("sphere" with a large radius in the z direction) and then subtract a box.

Also, in 205/crystal, does vfoam refer to the average flow velocity of bubbles after entering the main channel?

From inletvel = num.vfoam * num.width / inletwidth, I guess it is the average flow velocity, but it is only used for a velocity inlet. If inletpressure_add or inletpressure is specified (as done in all examples), that parameter is not used and will not affect anything.

[Moxing529]

But when I use a pressure inlet, changing vfoam still affects the size of the generated bubbles. Also, in ( n.Ca = p.mu_liquid \times p.vfoam / p.sigma ), does vfoam also have some influence?

[pkarnakov]

Right, vfoam is used for computing Ca in Numbers(). Eventually the five numbers there should define the problem. So if Ca or sidevel_ratio changes, the size of bubbles may also change. I'm not sure I recall all the details now, but I'd base all calculations on the dimensionless parameters instead of physical units.