[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!