**4. Conclusions**

In this paper, the CFD-DEM coupling method was applied to study the distribution and motion features of various-sized and three different-shaped particles in a single-channel pump. The results are compared with the experimental ones, which prove that the CFD-DEM method used in this paper is reliable. The conclusions obtained from this research are as follows:


**Author Contributions:** Conceptualization, C.T. and Y.-J.K.; methodology, C.T. and Y.-J.K.; software, C.T.; validation, C.T. and Y.-J.K.; formal analysis, C.T.; investigation, C.T.; resources, C.T. and Y.-J.K.; data curation, C.T.; writing—original draft preparation, C.T. and Y.-J.K.; writing—review and editing, C.T. and Y.-J.K.; supervision, Y.-J.K. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) gran<sup>t</sup> funded by the Ministry of Land, Infrastructure and Transport (Grant 20CTAP-C157760-01).

**Conflicts of Interest:** The authors declare no conflict of interest.
