Assignment 3-2D Element Formulation Challenge

AIM:

1. Run the simulation with the default property card (CASE 1)
2. Changing the property card ( CASE 2)
3. Comparing CASE 1 & CASE 2

PROCEDURE

CASE 1 : WITHOUT ASSIGNING THE RECOMMENDED PARAMETER IN THE PROPERTY

• Import the model in RADIOSS user interface
• Import the file as SOLVER DECK

IMPORT FILE

• Then assign the value of time step in ENG_RUN cars as 55ms as per question

ENGINE RUN CARD

• Then assign the number of animation steps. I choose 40ms as number of animation step as per the question.
  

T frequency = Termination Time / Number of Animation step

= 55/40

=1.37

T frequency Set

• In the property card every parameter property is by default shown below

PROPERTY CARD

• Run the simulation using following option

Analysis→Radioss

ANALYSIS → RADIOSS

• In the RUN OPTION panel it is recommended to write -nt 4. not stands for number thread it assigned to do the simulation at faster rate.

FILE RUN

• Click the ''Radioss'' the simulation completed.
• Now click on RESULT, it will directly take you to hyperview where we can see the animation of the simulation. Animation file are in name of h3d
• After switching the RESULT to see the deformation I choose VON MISSES and click apply

CHANGES IN HYPERVIEW

• Now we can see animation

ANIMATION OF CRASH

• Now we can see the output of simulation in 0001.out file

ERROR PERCENTAGE

• SAFE TOLERANCE IS -15% TO +5%
• The error value lies between the tolerance value so it is acceptable.
• For plotting graph we have to switch to hypergraph tab and import file T01 which is stands for time history

CASE 2 : ASSIGNING THE RECOMMENDED PARAMETER IN THE PROPERTY

• Assign all the parameter property

PROPERTY FOR HAT-SECTION

PROPERTY FOR CLOSE-OUT PANEL

• After assigning run the simulation same as above simulation
• Now we can see animation

ANIMATION OF CRASH

• Now we can see the output of simulation in 0001.out file

ERROR PERCENTAGE

• SAFE TOLERANCE IS -15% TO +5%
• The error value lies between the tolerance value so it is acceptable.
• For plotting graph we have to switch to hypergraph tab and import file T01 which is stands for time history

COMPARISON OF THE CASE 1 & CASE 2

COMPARISION	CASE - 1	CASE - 2
OBTAINED MAXIMUM ENERGY ERROR	-10.3%	-0.1%
OBTAINED MAXIMUM KINETIC ENERGY	0.3569E+08	0.4377E+08
OBTAINED MAXIMUM INTERNAL ENERGY	0.1928E+08	0.1747E+08
HOURGLASS ENERGY	Varying so the elements does not have physical stabilization	Constant so the elements have physical stabilization
REQUIREMENT OF HOURGLASS ENERGY BALANCE	Yes	No
RESULT	Less accuracy	More accuracy

CONCLUSION:

• Learned how to carry out simulation.
• Learned about assain property card.
• Learned how to use Hypergraph.
• Leaned about hourglass and how to remove hourglass errors.