**6. Conclusions**

This study showed that varying the input parameters (average fiber length, fiber volume content, and initial alignment) within one material range for fiber orientation modeling does not have a large influence on the final orientation. Although the fiber volume content and the average fiber length varied over the flow, these changes did not a ffect the fiber orientation model parameters. Thus, it can be concluded that one constant set of parameters is su fficient for one material. This reduces the needed time for parameter identification significantly.

For materials with di fferent viscosities, the average fiber length and fiber content parameters need to be determined again. To evaluate the dependence of the input on the model parameters and, thus, the fiber orientation results, the variations in the parameters must be wider.

**Author Contributions:** Conceptualization, S.K., A.K., and T.O.; methodology, A.K. and S.K.; software: S.K.; validation, A.K.; writing—original draft preparation, A.K.; writing—review, S.K.; visualization, A.K. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Acknowledgments:** The authors would like to express their thanks to Mohamed Besher Baradi (Robert Bosch GmbH) for providing the code for the RMSD evaluation.

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