Calculate Forces Acting on Servo Wall

Submitted by berlinphoenix on Tue, 03/30/2021 - 15:40

Hello i'm using a servo wall for a ring shear cell. Now i want to calculate the forces acting on the servo wall during a shear run. I have not been able to output the forces data. Can somebody help me? How can i output the data over time into a single .txt file. Thanks a lot!

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AlexSM | Tue, 03/30/2021 - 16:36

Hello,
If you want to get this data you need to custom your dump. Considering your face is named cad1, use :

thermo_style custom step f_cad1[1] f_cad1[2] f_cad1[3]

And in your log.liggghts you will have the table you look for.

See the documentation https://www.cfdem.com/media/DEM/docu/fix_mesh_surface_stress_servo.html

"This fix stores a global vector with 9 components for access by various output commands. The first 3 components are equal to the total force on the mesh, the next 3 components store the total torque on the mesh. The last 3 components output the wall position.."