*HEADING
EC24AFE4: EIGENVALUE ANALYSIS, ACOUSTIC ORGAN PIPE MODES  [AC2D4]
*NODE, Nset=ODB_NSET
1, 
21,,165.8
101,1.
121,1.,165.8
*NGEN,NSET=NALL
1,21
101,121
*ELEMENT,TYPE=AC2D4,ELSET=EALL
1,1,101,102,2
*ELGEN,ELSET=EALL
1,20
*MATERIAL,NAME=AIR
*DENSITY
1.293, 
*ACOUSTIC MEDIUM,BULK MODULUS
1.42176E5, 
*SOLID SECTION,MATERIAL=AIR,ELSET=EALL
**
** Sets added by addodb
**
*Elset,Elset=ODB_ESET
EALL,
**
**
*Nset, Nset=ODB_NSET
ODB_NSET, NALL
**
**
*STEP
 OPEN/OPEN CONDITION
*FREQUENCY, eigensolver=lanczos
3, , ,1. 
*BOUNDARY
1,8
101,8
21,8
121,8
*NODE PRINT
POR,PPOR
*OUTPUT,FIELD,VARIABLE=PRESELECT,OP=ADD,FREQUENCY=9999
*OUTPUT,FIELD, OP=ADD
*MODAL OUTPUT,VARIABLE=ALL
*OUTPUT,HISTORY,OP=ADD
*MODAL OUTPUT,VARIABLE=ALL
*END STEP
*STEP
 OPEN/CLOSED CONDITION
*FREQUENCY, eigensolver=lanczos
3, , ,1. 
*BOUNDARY
1,8
101,8
*NODE PRINT
POR,PPOR
*OUTPUT,FIELD, OP=ADD
*MODAL OUTPUT,VARIABLE=ALL
*OUTPUT,HISTORY,OP=ADD
*MODAL OUTPUT,VARIABLE=ALL
*END STEP