FEM acoustics of a simplified compartment model II
This is an example of a simplified compartment model with tetrahedal elements. It is shown how to set up a model for frequency domain FEM acoustics with *FREQUENCY_DOMAIN_ACOUSTIC_FEM and how to post-process with *DATABASE_FREQUENCY_BINARY_D3ACS. Results can be compared with the example ''BEM acoustics of a simplified compartment model'' and ''FEM acoustics of a simplified compartment model I''. Example 9.2 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
https://www.dynaexamples.com/nvh/example-09-02
https://www.dynaexamples.com/@@site-logo/LS-DYNA-Examples-Logo480x80.png

# FEM acoustics of a simplified compartment model II

This is an example of a simplified compartment model with tetrahedal elements. It is shown how to set up a model for frequency domain FEM acoustics with *FREQUENCY_DOMAIN_ACOUSTIC_FEM and how to post-process with *DATABASE_FREQUENCY_BINARY_D3ACS. Results can be compared with the example ''BEM acoustics of a simplified compartment model'' and ''FEM acoustics of a simplified compartment model I''. Example 9.2 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.

*CONTROL_TERMINATION

*CONTROL_TIMESTEP

*DATABASE_BINARY_D3PLOT

*DATABASE_BINARY_D3THDT

*DATABASE_BINARY_RUNRSF

***DATABASE_FREQUENCY_BINARY_D3ACS**

*DEFINE_CURVE

*ELEMENT_SOLID

*END

***FREQUENCY_DOMAIN_ACOUSTIC_FEM**

*KEYWORD

*MAT_ELASTIC_FLUID

*NODE

*PART

*SECTION_SOLID

*SET_NODE_LIST

*SET_SEGMENT

*TITLE

*KEYWORD

*TITLE

Acoustic analysis of a simplified compartment model by FEM

*FREQUENCY_DOMAIN_ACOUSTIC_FEM

1.2300E-12 340000. 10. 500. 491 2.e-11

5 0

1 2 11 5 3 2 1.

200 1

*DATABASE_FREQUENCY_BINARY_D3ACS

1

*CONTROL_TERMINATION

0.187970 0 0.000 0.000 50.000000

*CONTROL_TIMESTEP

0.000 0.800000 0 0.000 0.000 0 0 0

0.000 0 0

*SET_NODE_LIST

200 0.000 0.000 0.000 0.000

113123 0 0 0 0 0 0 0

*DEFINE_CURVE

2 0 0.000 0.000 0.000 0.000 0

0.000 0.000

1000.0000000 0.000

*DEFINE_CURVE

3 0 0.000 0.000 0.000 0.000 0

0.000 7.0000000

1000.0000000 7.0000000

*DATABASE_BINARY_D3PLOT

0.001000 0 0 0 0

0

*DATABASE_BINARY_D3THDT

5.0000E-4 0 0 0 0

*DATABASE_BINARY_RUNRSF

5000.0000 0 0 0 0

*PART

New part from tetrahedron mesher

5 5 5

*MAT_ELASTIC_FLUID

5 1.220000 0.000 0.000 0.000 0.000 141.03000

0.000 0.000

*SECTION_SOLID

5 10

*ELEMENT_SOLID

*NODE

*SET_SEGMENT

*END