Assignment 3-2D Element Formulation Challenge

Objective - Running Simulation & comparison of results with base simulation and improved shell element properties.

Question -

1. Using the crash beam file from the previous assignment, change the run time to 55 ms.

2. Change the number of animation steps during simulation to a minimum of 25 and a maximum of 60.

3. Run the base simulation without any modification to element properties.

4. At the end of the simulation, do the energy error and mass error checks and determine whether the results would be acceptable.

5. If acceptable, Plot rigid wall forces, internal energy, hourglass energy, contact energy, and total energy of the simulations.

6. Change all the shell element's properties to recommended properties, save this as separate, rad files and run the simulation.

7. Follow steps 5 and 6.

8. Create a brief report comparing all the results from steps 5 and 6 for both simulations.

9. Comment whether there is any change in the results and why there is any change in the result.

Procedure -

CASE 1:

• Open Hypermesh & Select the Radioss profile:
• Import solver deck and check for control cards & edit the parameters as shown(Run time = 55 ; animation steps during simulation - 42.5 ; Tfreq = 55/42.5 = 1.294) :

• Open the analysis>Radioss (in options we put -nt 4 for faster computing with 4 cores of CPU) and run the solver :

• After the analysis open contour,>von mises>simple averaging & the simulation is shown below :

• The Engine out file is as shown & is checked for energy & mass errors :

• Energy error - -10.3% Mass Error - 0.1659E-03

• Open hypergraph>load the T01 file>plot graphs for the required parameters as shown below :

CASE 2:

• Open Hypermesh & Select the Radioss profile.
• Import solver deck and check for control cards & edit the parameters as shown(Run time = 55 ; animation steps during simulation - 42.5 ; Tfreq = 55/42.5 = 1.294) :

• Change the element properties to the required properties as shown :

• Open the analysis>Radioss (in options we put -nt 4 for faster computing with 4 cores of CPU) and run the solver :

• After the analysis open contour,>von mises>simple averaging & the simulation is shown below :

• The Engine out file is as shown & is checked for energy & mass errors :

• Energy error - -0.1% Mass Error - 0.1659E-03
• Open hypergraph>load the T01 file>plot graphs for the required parameters as shown below :

Result :

The above two cases have been compared :

Parameters	Case 1	Case 2
Internal Energy Error	-10.3%	-0.1%
Mass Error	0.1659E-03	0.1659E-03
Kinetic Energy	0.1932E+08	0.1749E+08
Hourglass Energy	Varying Hourglass energy	Constant Hourglass energy
Results	Unstable	Stable