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This example of a pulsating sphere in half-space shows how to set up reflection conditions with *FREQUENCY_DOMAIN_ACOUSTIC_BEM_HALF_SPACE. In the files domgeom.k the domain decompositions can be studied. Example 8.9 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
Keywords
*CONTROL_TERMINATION
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_ACOUSTIC_BEM
*KEYWORD
*MAT_RIGID
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*TITLE
*CONTROL_TERMINATION
*DEFINE_CURVE
*DEFINE_PLANE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_ACOUSTIC_BEM_HALF_SPACE
*KEYWORD
*MAT_RIGID
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*TITLE
*KEYWORD
*TITLE
Pulsating sphere in half-space
*FREQUENCY_DOMAIN_ACOUSTIC_BEM
1.210000 343.00000 1.000000 300.00000 300 0 0.000 2.0000E-5
1 1 0 0 0
3 2000 1.0000E-6 5
1
1 1 1 3 2
*CONTROL_TERMINATION
0.001000 0 0.000 0.000 0.000
*PART
sphere
1 1 1 0 0 0 0 0
*SECTION_SHELL
1 0 0.000 0 0 0 0 0
0.100000 0.100000 0.100000 0.100000 0.000 0.000 0.000 0
*MAT_RIGID
1 0.100000 0.300000 0.000 0.000 0.000 0.000
1.000000 7 7
0.000 0.000 0.000 0.000 0.000 0.000
*DEFINE_CURVE
2 0 0.000 0.000 0.000 0.000 0
1.0000000 -1.0000000
5000.0000000 -1.0000000
*SET_NODE_LIST
1 0.000 0.000 0.000 0.000
12222
*ELEMENT_SHELL
*NODE
*END
*KEYWORD
*TITLE
Pulsating sphere in half-space
*FREQUENCY_DOMAIN_ACOUSTIC_BEM_HALF_SPACE
1.21 343.0 1. 300. 300 0.005 0.0 20.e-6
1 1 0 0 0
3 2000 1.e-6 8
1
1 1 1 3 2
1
*DEFINE_PLANE
1 1.0 0.0 -1.5 0.0 1.0 -1.5
0.0 0.0 -1.5
*CONTROL_TERMINATION
0.001000
*PART
sphere
1 1 1
*SECTION_SHELL
1
0.100000 0.100000 0.100000 0.100000
*MAT_RIGID
1 0.100000 0.300000 0.000 0.000 0.000 0.000
1.000000 7 7
0.000 0.000 0.000 0.000 0.000 0.000
*DEFINE_CURVE
2
1.00000000 -1.0000000
5000.0000000 -1.0000000
*SET_NODE_LIST
1
12222
*ELEMENT_SHELL
*NODE
*END
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