*2.7. Soybean Seed Particle Model and Simulation Parameters*

It was clear from our previous work that geometric models of soybean seed particles with different sphericities can be built by 5-, 9-, and 13-sphere models [19]. In this paper, two hundred grains of each variety were selected and measured to obtain the average triaxial dimensions, as well as the sphericity of soybean seed particles, as shown in Table 1.


**Table 1.** Triaxial dimensions of soybean seed particles of three varieties.

The 13-sphere model was chosen for the simulation, as shown in Figure 8, with powder generation performed according to volume normal distribution; the simulation parameters are shown in Table 2.

**Figure 8.** The 13-sphere model of (**a**) SN42, (**b**) JD17, and (**c**) ZD39.

**Table 2.** Parameters used in the simulation.

