*HEADING
 Same as iwr_1d_1_xpl_p_pa.inp except that the total wave formulation is used
 and also the incident wave load sign is reversed.  There should not be any 
 change in the solution. 
**
 1D transient wave propagation, acoustic medium, incident wave 
 load and incident wave reflection, planar and defined through 
 pressure amplitude
**
*ACOUSTIC WAVE, TYPE=TOTAL
*PREPRINT,ECHO=NO,HISTORY=NO,MODEL=NO
*NODE,NSET=BRICK
 1,-0.5,-0.5
 2,0.5,-0.5
 3,0.5,0.5
 4,-0.5,0.5
 5,-0.5,-0.5,-1.
 6,0.5,-0.5,-1.
 7,0.5,0.5,-1.
 8,-0.5,0.5,-1.
*NSET,NSET=PLATE
1,2,3,4
*ELEMENT,TYPE=AC3D8R,ELSET=ACOUSTIC
 1,1,4,3,2,5,8,7,6,
**************************
*SURFACE,NAME=ABSORB
1,S2
*SURFACE,NAME=IW_LOAD
1,S1
**************************
*SOLID SECTION,MATERIAL=AIR,ELSET=ACOUSTIC
*MATERIAL,NAME=AIR
*DENSITY
 1.,
*ACOUSTIC MEDIUM,BULK MODULUS
 0.16E6,
**************************
*INCIDENT WAVE PROPERTY,NAME=IWPROP,TYPE=PLANE
0.0,0.0,0.
0.0,10.0,10.
*INCIDENTWAVE FLUID PROPERTY
 0.16E6, 1.
*AMPLITUDE,DEFINITION=periodic,NAME=PRESSUREVTIMESINE
1,350.0,0.0,0.0
0.0,-1.0
*AMPLITUDE,DEFINITION=tabular,NAME=PRESSUREVTIMESTEP
0.0,0.0,0.01,-1.0
**************************
**************************
*STEP
*DYNAMIC,EXPLICIT,DIRECTUSERCONTROL
0.0001,0.06
**
*SIMPEDANCE,NON=PLAN
 ABSORB,
*INCIDENTWAVE,PRESSUREAMPLITUDE=PRESSUREVTIMESTEP,PROPERTY=IWPROP
IW_LOAD,1.0
**
*INCIDENT WAVE REFLECTION
20.0,0,-1,0, -1.0
**
*OUTPUT,FIELD,NUMBERINTERVAL=1
*NODE OUTPUT,NSET=BRICK 
POR, 
*OUTPUT,HISTORY,FREQUENCY=1
*NODE OUTPUT,NSET=PLATE
POR,
**
*END STEP
*STEP
*DYNAMIC,EXPLICIT,DIRECTUSERCONTROL
0.0001,0.09
**
*SIMPEDANCE,NON=PLAN
 ABSORB,
*INCIDENTWAVE,PRESSUREAMPLITUDE=PRESSUREVTIMESTEP,PROPERTY=IWPROP
IW_LOAD,-3.0
**
*INCIDENT WAVE REFLECTION
15.0,0,-1,0, -1.0
**
*END STEP