Assignment 3-2D Element Formulation Challenge
Objective
The objective of this assignment is to compare the simulation with default value and the recommended values and figure out in the changes in energy and force.
Steps
1. Run time were change to 55 ms [Model- cards-ENG_RUN]
2. Set the number of animation steps during simulation to min. 25 and frequency =1 [Model- cards- ENG _ANIM_DT]
Run the base simulation with default value and recommended properties then compared the results as follows-
Energy v/s time plot [Toolbar- hyper graph 2D]
Hour glass energy was almost zero in case of recommended properties due to QEPH shell formation.
Rigid wall v/s time plot [Toolbar- hyper graph 2D]
Force was maximum at the beginning and almost same for both cases. In case of default value, a sudden spike in force occurred at 20 ms. whereas, no sudden spike was found with QEPH shell formation.
Displacement contour [Toolbar- hyper view]
Von-mises stress contour [Toolbar- hyper view]
Von-mises stress with default values- 343.67
Von-mises stress with recommend values- 349.98
Both values was almost same
Energy error and mass error values [open _0001.out file in notepad]
Energy error for default value simulation was -10.3% i.e. within the acceptable limit.
For recommended properties, it was closer to 0% i.e. better because there is no hourglass energy and computation is more accurate.
Conclusion-
Hour glass energy was found to be almost zero in case of QEPH shell formation
Displacement and von mises stress was almost same in both cases
No spikes in the forces were found with QEPH shell formation due to the physical stabilization by QEPH element.