Unable to use the spheres_and_cylinders size factor model

[JahanzebTariq]

Greeting, @jgostick and @ma-sadeghi I am trying to use the module named Spheres and Cylinder for the hydraulic size factor but not being able to do it because the throat diameter is greater than the pore diameter. Please address this issue, so that I may proceed further

pn.add_model(propname='throat.hydraulic_size_factors',model=op.models.geometry.hydraulic_size_factors.cones_and_cylinders)

In this code I am given the restriction of not being able to use Spheres and Cylinders instead of Cones and Cylinders. Kindly address my issue and please do tell me the reason. Thank you

[ma-sadeghi]

As the error message says: when throat diameter is greater than the diameter of adjacent pores, you can't "physically" fit a stick and ball conduit in that location.

In previous versions, we used to catch and "fix" these unphysical circumstances by applying some opinionated rule, but in version 3, we decided to not do that anymore.

[JahanzebTariq]

so sir what would you recommend.. should I go with cones_and_cylinders.. and if so why is it..? meaning is it a trail and error method to get a good result.. because previous code used pyramids and cones in this place.. is it users discretion to use what ever he likes..? @ma-sadeghi

[ma-sadeghi]

As far as I know, choosing the right size factor model is a trial and error process. I've always wanted to do a thorough benchmark of all available size factor models for both flow and diffusion, but I don't see it happening in the forseeable future.

[JahanzebTariq]

So According to you if I am asked about the selection procedure, then I would answer the above statement..? please sir @ma-sadeghi

[ma-sadeghi]

That's how I would respond. Of course, if your actual geometry "looks" like a stick and ball model, then in principle, spheres_and_cylinders should give the best result.

[JahanzebTariq]

@ma-sadeghi .. Thank you sir.. You people are really Awesome .. I can't thank you enough..