*HEADING
 EC3KAFAD: AC3D20 ELEMENTS
 Acoustic test - 1D Problem, SS-DIRECT.
 A 4m long tube; from left to right,
 a sound source, 3m is air, then 1m of a highly
 absorbent material, followed by a rigid
 termination. 
*PREPRINT,ECHO=NO,HISTORY=NO,MODEL=NO
*RESTART,WRITE
***********************************************************
**
**
**   Mesh Generation
**
*NODE, Nset=ODB_NSET
    1, 0, 0,  0
  401, 4, 0,  0
  501, 0, 0, -2
  901, 4, 0, -2
 1001, 0, 2,  0
 1401, 4, 2,  0
 1501, 0, 2, -2
 1901, 4, 2, -2
 2001, 0, 1,  0
 2401, 4, 1,  0
 2501, 0, 2, -1
 2901, 4, 2, -1
 3001, 0, 1, -2
 3401, 4, 1, -2
 3501, 0, 0, -1
 3901, 4, 0, -1
*NGEN,NSET=ALL
    1,401
  501,901
 1001,1401
 1501,1901
 2001,2401
 2501,2901
 3001,3401
 3501,3901
*NSET,NSET=QA_TEST,GENERATE
 1,401,10
*NSET,NSET=CRNRLOAD
 1,1001,1501,501
*NSET,NSET=SIDELOAD
 2001,2501,3001,3501
*ELEMENT,TYPE=AC3D20
 1,1,3,503,501,1001,1003,1503,1501,
 2,3503,502,3501,1002,2503,1502,2501,
 2001,2003,3003,3001
*ELGEN,ELSET=CHANNEL
 1,150,2
*ELEMENT,TYPE=AC3D20
 301,301,303,803,801,1301,1303,1803,1801,
 302,3803,802,3801,1302,2803,1802,2801,
 2301,2303,3303,3301
*ELGEN,ELSET=ABSORB
  301,50,2
*elset,elset=one
 1, 
************************************************
**    ** ELEMENT PROPERTIES **
**
*SOLID SECTION,MATERIAL=AIR,ELSET=CHANNEL
*SOLID SECTION,MATERIAL=ABSORB,ELSET=ABSORB
**
**
*MATERIAL,NAME=AIR
*DENSITY
 1.21,
*ACOUSTIC MEDIUM,BULK MODULUS
 0.1424E6,
**
**
*MATERIAL,NAME=ABSORB
*DENSITY
 1.21,
*ACOUSTIC MEDIUM,BULK MODULUS
 0.1424E6,
*ACOUSTIC MEDIUM,VOLUMETRIC DRAG
 1e4,
**
**
**
*************************************************
**
*Elset,Elset=ODB_ESET
CHANNEL, ABSORB
**
**
*Nset, Nset=ODB_NSET
ODB_NSET, ALL, QA_TEST
**
**
*STEP
*STEADY STATE DYNAMICS,DIRECT,FREQUENCY SCALE=LINEAR
 10,1100,13,1
**
** Prescribe outward acceleration of 100 at node LOAD.
** To prescribe a total outward volume acceleration
** of 1 on the face with area 4, the load must be 
** distributed in the ratios (-1/12,1/3) to the
** (corner,midside) nodes, respectively:
**
*CLOAD
 CRNRLOAD,8,   .33333E2
 SIDELOAD,8, -1.33333E2
*NODE PRINT, NSET=QA_TEST
 POR,PPOR,
*EL PRINT,FREQUENCY=0
*ENERGYPRINT
*OUTPUT,FIELD
*NODE OUTPUT,NSET=QA_TEST
 POR,
*ELEMENT OUTPUT
ACV,INTEN,GRADP,ENER,ELEN,ELEDEN
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=QA_TEST
 POR,
*ENERGY OUTPUT
ALLSE,ALLKE,ALLWK,ALLVD
*ENDSTEP
**
**
*STEP
*FREQUENCY,NORM=MASS,EIGENSOLVER=LANCZOS, SIM=NO
50, , ,
*NODE PRINT,F=0
*EL PRINT,F=0
*OUTPUT,FIELD,Frequency=0
*END STEP
**
**
*STEP
*STEADY STATE DYNAMICS,SUBSPACE PROJECTION=EIGENFREQUENCY,FREQUENCY SCALE=LINEAR,INTERVAL=RANGE
 100,1100,3,1
**
** Prescribe outward acceleration of 100 at node LOAD.
** To prescribe a total outward volume acceleration
** of 1 on the face with area 4, the load must be 
** distributed in the ratios (-1/12,1/3) to the
** (corner,midside) nodes, respectively:
*CLOAD
 CRNRLOAD,8,   .33333E2
 SIDELOAD,8, -1.33333E2
**
*NODE PRINT, NSET=QA_TEST
 POR,PPOR,
*EL PRINT,FREQUENCY=0
*energyprint
*OUTPUT,FIELD,VARIABLE=PRESELECT,OP=ADD,FREQUENCY=9999
*OUTPUT,FIELD, OP=ADD
*NODE OUTPUT,NSET=QA_TEST
 POR,
*ELEMENT OUTPUT,ELSET=ABSORB
ACV,INTEN,GRADP
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=QA_TEST
 POR,
*ENERGY OUTPUT
ALLSE,ALLKE,ALLWK,ALLVD
*ENDSTEP