*HEADING
VERIFICATION OF ACOUSTIC/STRUCTURAL ANALYSIS - UNCOUPLED CASE
   TEST TEMPERATURE AND FV DEPENDENCE OF ACOUSTIC PROPERTIES
*NODE,NSET=QA_TEST
*ELEMENT,TYPE=AC1D2,ELSET=FLUID
*ELEMENT,TYPE=MASS,ELSET=MASS
*ELEMENT,TYPE=SPRING1,ELSET=SPRING
*ELEMENT,TYPE=DASHPOT1,ELSET=DASHPOT
*SOLID SECTION,MATERIAL=FLUID,ELSET=FLUID
*MATERIAL,NAME=FLUID
*DENSITY,DEPENDENCIES=1
**0.4008 = nominal density
0.1008,30.,3.
0.3008,70.,3.
0.5008,30.,9.
0.7008,70.,9.
*ACOUSTIC MEDIUM,DEPENDENCIES=2
**10.
*ACOUSTIC MEDIUM,DEPENDENCIES=1,VOLUMETRIC DRAG
**0.04
*MASS,ELSET=MASS
4.,
** add dummy frequency dependencies for spring and dashpot
*SPRING,ELSET=SPRING
1,
1.0,0.
1.0,1.
*DASHPOT,ELSET=DASHPOT
1,
0.08,0.
0.08,1.
*IMPEDANCE PROPERTY,NAME=RAS
*BOUNDARY
10, 8,
20, 2, 3
*INITIAL CONDITIONS,TYPE=TEMPERATURE
10,50.
20,50.
*INITIAL CONDITIONS,TYPE=FIELD,VARIABLE=1
10,6.
20,6.
*INITIAL CONDITIONS,TYPE=FIELD,VARIABLE=2
10,5.
20,5.
*RESTART,WRITE,FREQUENCY=999
************************************************
*STEP
*FREQUENCY, eigensolver=lanczos
2, ,
*MODAL FILE
*END STEP
************************************************
*STEP
*STEADY STATE DYNAMICS,SUBSPACE PROJECTION,INTERVAL=RANGE, FREQUENCY SCALE=LINEAR
0.,.3,31,0.
*IMPEDANCE
1,I2,RAS
*CLOAD
20,1,1.0
20,8,1.0
*NODE PRINT,SUMMARY=NO,NSET=QA_TEST
U1,POR,
*NODE FILE,NSET=QA_TEST
U,POR,
*OUTPUT,HISTORY,OP=NEW
*NODE OUTPUT,NSET=QA_TEST
U,POR,
*OUTPUT,FIELD,OP=ADD,FREQUENCY=99999,VARIABLE=PRESELECT
*END STEP
*STEP
*STEADY STATE DYNAMICS, DIRECT,FREQUENCY SCALE=LINEAR
0.,.3,31,0.
*IMPEDANCE
1,I2,RAS
*CLOAD
20,1,1.0
20,8,1.0
*END STEP