[hani]

Comments and questions are welcomed on the article Montella et al., Implementing moving object capability in a two-phase Eulerian model for sediment transport applications, OpenFOAM Journal, 22 April 2024, https://doi.org/10.51560/ofj.v4.119.

[eduard.puig.montella]

Hi everyone! I am one of the authors of this article, and I'd be happy to answer any questions related to this work

[griffincollins11]

thank you for offering to answer questions. I'm curious about the specific numerical methods used for the moving object implementation. Did you encounter any challenges with stability or convergence, especially with complex geometries or high velocities? slope

[eduard.puig.montella]

Thank you for your interest in the work. Regarding the numerical technique for handling the motion of the object, we used overset and morphing mesh approaches without modifications, so there are no novel developments in that aspect. However, if you have specific questions on the numerical method, I’d be happy to answer them.


The main challenge we encountered is not strictly related to complex geometries or high velocities but rather to rapid changes in sediment concentration. Since the solid pressure is computed based on sediment concentration, a fast-moving object compressing a dense granular region can cause an unrealistic buildup of solid pressure. This, in turn, affects the forces exerted on the moving object. However, this issue is mainly relevant for fast-moving objects in dense granular matter, and one can try to mitigate them reducing the time step. Let me know if you’d like further details!

[Isla Turner]

This is a fascinating article on implementing moving object capability within the Eulerian model! I'm particularly interested in how the two-phase approach handles complex geometries and their influence on sediment transport. Have the authors considered using different turbulence models to further refine the accuracy, especially in areas with highly unsteady flows near the moving object? Also, I wonder if something akin to a Sprunki fluid simulation could provide further insights into the interactive fluid structure. Excellent work overall!

[eduard.puig.montella]

Thank you for your interest and for the positive feedback.


Regarding turbulence modeling, the focus of this work was primarily on validating the moving object capability within the Eulerian two-phase framework and its impact on sediment transport mechanisms. For this reason, we relied on a relatively simple turbulence closure to limit the number of interacting parameters. That said, exploring alternative turbulence models is certainly a rlevant direction for future work.


As for interactive or real-time fluid simulations, while such approaches can be useful for visualization or qualitative insights, our emphasis here was on physics-based modeling suitable for quantitative analysis and geophysical applications.


Thank you again