Discussion Forum

Hi,

I am implementing a mechanical model to characterize the interaction between a drill and lunar regolith. I am basing the model in a paper that has analytical and test results so I can validate it later. From the simulations I need to retrieve the reaction Force and Torque between the drill and the regolith, considering that the former rotates and penetrates with defined velocities.

Initially I wanted to have a time-dependent study, but after trying for a couple of months without getting any results, I decided to move to a stationary case to assess both the force and torque at different depths. After some time I could make it converge and give what seems to be good results.

However, COMSOL does not allow to include a prescribed velocity of the drill in the stationary case (which makes sense) but I need to find a way to include a condition that recreates this velocity. I have tried to include a prescribed deformation, but I am not getting the results I expected.

I would like to ask for some recommendation to include a condition that recreates this penetration speed in the stationary case or, if possible, some advice to make the time-dependent solver converge. I am attaching a Google Drive link to the model in case you need it.

Thank you so much in advance!

(Link: https://drive.google.com/file/d/1GaoCKnW7yVVwVJ1-vpFyl1yktSUpQzp9/view?usp=sharing )