*HEADING
 EC23AFAV: AC2D3
 1D transient wave propagation in an acoustic medium with CLOAD on dof 8.
 Verification problem: Transient Dynamics Tests
**
** C = root (K/rho)= 343.05 m/s   K=bulk mod, rho=density.
**
** Analytic solution to prescribed constant acceleration of a0 at x=0
**
** p(x,t) = (K a0 / c^2) (ct - x)  for x < ct
**        = 0  			   for x > ct
**
*PREPRINT,ECHO=NO,HISTORY=NO,MODEL=YES
*NODE, Nset=ODB_NSET
*NGEN,NSET=CHANNEL
*NSET,NSET=SAMPLE,GENERATE
*NSET,NSET=LOAD
*ELEMENT,TYPE=AC2D3
*ELGEN,ELSET=CHANNEL
*SOLID SECTION,MATERIAL=AIR,ELSET=CHANNEL
 1.e-2,
** Cross-section is 1.0e-4
**
*MATERIAL,NAME=AIR
*DENSITY
 1.21,
*ACOUSTIC MEDIUM,BULK MODULUS
**
**
*RESTART,WRITE
**
**
** Sets added by addodb
**
*Elset,Elset=ODB_ESET
CHANNEL,
**
**
*Nset, Nset=ODB_NSET
ODB_NSET, CHANNEL, SAMPLE, LOAD
**
**
*STEP,INC=1000
*DYNAMIC
.0001,.0044
** Define nonreflective boundary at x=1
*IMPEDANCE
 199,I2
**
** Prescribe volume acceleration inwards
**     of  a0=1.
**     Distribute half to each node on edge.
*CLOAD
 LOAD,8,0.5e-4
**
*EL PRINT,FREQ=0
*NODE PRINT,NSET=SAMPLE,FREQ=22
 POR,
*NODE FILE,NSET=SAMPLE,FREQ=22
 POR,
*OUTPUT,FIELD,VARIABLE=PRESELECT,OP=ADD,FREQUENCY=9999
*OUTPUT,FIELD, OP=ADD,Frequency=22
*NODE OUTPUT,NSET=SAMPLE
 POR,
*OUTPUT,HISTORY,OP=ADD,Frequency=22
*NODE OUTPUT,NSET=SAMPLE
 POR,
*ENDSTEP