Bird Strike - Project - 2

Aim:

To create the simulation of bird strike on the Aero Engine from the given FE model by using Ls-dyna.

Procedure:

1. Open the model in LS-Prepost and Check the given Model.

2. Create a section, hourglass, material card for all the model that are required as per requirement and assign them.

3. Create a main Project_2.k file. Create a Include card and add all the model file.

4. Lock the all DOF of casing. Go to Model - Create Entity - Boundary - SPC.

5. Create a Initial velocity card for bird and Angular Velocity blade.

Firstly create node set velocity.

6. Create a Contact between parts. Go to Model - Keyword Manager - Contact.

1. Bird and Blades : Node to Surface Automatic Contact.

2. Hub and Blade: Tied Surface to Surface

3. Blade: Automatic Single Surface

4. Blade and Casing: Automatic Surface to Surface

7. Create Control Card and Output Request Card.

8. Run the Model Checker.

9. Use the Renumbering option. To renumber 100000+ for nodes, 500000+ for elements, and 1000+ for the parts. All other keywords numbered within 10000-19999.

10. Save the file and Run the Sumulation.

11. Open D3PLOT file and Contour vonmises stress and Strain.

Maximum Von-Stress = 0.0826347 GPA at element no 505376 in Blade.

Maximum Strain = 0.206718 at element no 508673 in Blade.

Mass Scaling:

Without mass scaling the estimated clock time was 19 minutes but it is completed in 15 minutes and 18 seconds. Mass scaling can be adopted to reduce the run time.

1. Go to Model - Keyword manager - Control - Timestep. Save the File and Run the simulation.

Trial 1: TSSFAC = 0.9 and DT2MS = -2.5E-4

Estimated Time: 6 Minutes

Increase mass percentage: 5.53%

2. Trail 2

TSSFAC = 0.9 and DT2MS = -2.7E-4

Estimated Time: 7 Minutes

Increase mass percentage: 8.46 %

3. Trail 3

TSSFAC = 0.9 and DT2MS = -2.671E-4

Estimated Time: 5 Minutes

Increase mass percentage: 7.99 %

Debugging:

The Bird Model is penetrating the blade so to fix this density of bird is adjusted.

Conclusion:

1. The keyword file to simulate bird strike on an Aero Engine is created by following the necessary conditions and requirements.

2. In the simulation, the blades at the impact zone are damaged and deformed.

3. Mass scaling approach was adopted to reduce the runtime with the optimum value of TSSFAC = 0.9 and DT2MS = -2.671E-4