[ponslo]

Hello, I would like to simulate particles being advected through a pipe due to a fluid flow. These particles can become attached to the wall of the pipe, and in turn attach to one another, thus creating obstructions on the pipe surface as they clump together.


Currently I've been playing around with DPMFoam and its Goldschmidt tutorial. I've noticed that if I set collisionModel to "none" in constant/kinematicCloudProperties and also set the localInteractionCoeffs to type "stick", then the particles stick to the wall, however if I turn the collision model back to "pairCollision" then no particles adhere to the wall.


Currently the total modification I've made to the tutorial is to change the localInteractionCoeffs for top, bottom, and walls to "stick". The e and mu variables are also still present.



Is it possible to have both particle-particle adhesion and particle-wall adhesion?


Thanks.

[frantov]

Hi Ponslo

Did you move forward on this?
Fran

[Lollum]

Hello Ponslo,


It is possible to have particle-particle and particle wall adhesion separately using the pairCollision model, which is in contrast with local interaction so I think only one should be used (according to my brief experience).
In the pairCollision specifications, under pairSpringSliderDashpotCoeffs and wallLocalSpringSliderDashpotCoeffs you should specify the cohesionEnergyDensity in J/m^3.
Apparently you should also set a flag for "adhesion true", but I'm not sure where in the code it should be inserted (I did try under the pairCollisionCoeffs in different points), please let me know if you find out.
Since I plan on working on the library, for now I took the long route recompiling the library and disabling the double check in the code (adhesion && cohesionEnergyDensity > 0).
LP