BEM acoustics of a pulsating sphere in half space

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.

*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