*HEADING 
RAPIDLY INCREASED AND THEN EXPONENTIALLY DROPPING PLANE PRESSURE WAVE 
LOADING ON A MASS FLOATING THRU' A COLUMN OF FLUID THAT CAN CAVITATE.  
COMPARE THE ABAQUS SOLUTION WITH THAT OF BLEICH & SANDLER (1970) WORK 
AS WAS PRESENTED IN THE PAPER BY SPRAGUE AND GEERS (2001).    
A FINE MESH WITH 381 ELEMENTS USED. 
**
FLUID COLUMN DEPTH: 3.81M
ACOUSTIC ELEMENT HEIGHT = 1.0E-2M I.E 381 ELEMENTS.
ACOUSTIC ELEMENT WIDTH = 3.81E-2M
ACOUSTIC ELEMENT THICKNESS = 1.0M
DRAFT OF THE FLOATING MASS = 0.145M 
PATM = 0.101E6 PA.
PMAX= 0.710E6 PA.
DECAYTIME= 0.9958E-3 SEC 
TIME INCREMENT SIZE HELD FIXED AT 3.445899e-6 = (DEL_Tcfl)/2
**
*PART,NAME=MODEL
*END PART
**
*ASSEMBLY,NAME=ASSEMBLY
**
*INSTANCE,NAME=INST,PART=MODEL
*NODE
1,    0.0,  0.0
382,  0.0, -3.81  
1001, 3.81E-2, 0.0
1382, 3.81E-2,-3.81  
*NGEN, NSET=LEFT
1, 382 
*NGEN, NSET=RIGHT
1001, 1382 
*NSET, NSET=FLUID
LEFT, RIGHT
*NODE, NSET=MASS
2001,  0.0,    0.0
3001, 3.81E-2, 0.0
*SURFACE, NAME=TOP
1, S4 
*SURFACE, NAME=BOT
381, S2 
*SURFACE, NAME=FLOAT, TYPE=NODE
MASS, 
*ELEMENT, TYPE=AC2D4R, ELSET=FLUID
1, 1, 2, 1002, 1001
*ELGEN, ELSET=FLUID
1,381  
*SOLID SECTION, ELSET=FLUID, MATERIAL=FLUID 
1.0
*ELEMENT, TYPE=MASS, ELSET=MASS
2001, 2001 
3001, 3001
*MASS, ELSET=MASS
2.73187 
*END INSTANCE
**
*TIE, NAME=MASS2FLUID
INST.TOP, INST.FLOAT
**
*END ASSEMBLY
**
*ACOUSTIC WAVE FORMULATION, TYPE=TOTAL WAVE
*MATERIAL, NAME=FLUID
*ACOUSTIC MEDIUM, BULK MODULUS
2.082242E9,
*ACOUSTIC MEDIUM, CAVITATION LIMIT 
0.0,
*DENSITY
989.0,
**
*INITIAL CONDITIONS, TYPE=ACOUSTIC STATIC PRESSURE
INST.FLUID,  0.101E6, 0.0, 0.145, 0.0, 0.13937177E6, 0.0, -3.81, 0.0
*INCIDENT WAVE PROPERTY,NAME=IWPROP,TYPE=PLANE
0.0, -3.81,
0.0, -4.81,
*INCIDENT WAVE FLUID PROPERTY
2.082242E9, 989.0
**
*AMPLITUDE,DEFINITION=TABULAR,NAME=PRESSUREVTIME
 0.000D+00, 0.000D+00, 0.138D-04, 0.203D-02, 0.277D-04, 0.805D-02, 0.415D-04, 0.180D-01
 0.553D-04, 0.318D-01, 0.692D-04, 0.493D-01, 0.830D-04, 0.705D-01, 0.968D-04, 0.953D-01
 0.111D-03, 0.124D+00, 0.124D-03, 0.155D+00, 0.138D-03, 0.191D+00, 0.152D-03, 0.229D+00
 0.166D-03, 0.271D+00, 0.180D-03, 0.316D+00, 0.194D-03, 0.364D+00, 0.207D-03, 0.415D+00
 0.221D-03, 0.469D+00, 0.235D-03, 0.526D+00, 0.249D-03, 0.585D+00, 0.263D-03, 0.648D+00
 0.277D-03, 0.713D+00, 0.290D-03, 0.781D+00, 0.304D-03, 0.851D+00, 0.318D-03, 0.924D+00
 0.332D-03, 0.100D+01, 0.456D-03, 0.882D+00, 0.581D-03, 0.779D+00, 0.705D-03, 0.687D+00
 0.830D-03, 0.607D+00, 0.954D-03, 0.535D+00, 0.108D-02, 0.472D+00, 0.120D-02, 0.417D+00
 0.133D-02, 0.368D+00, 0.145D-02, 0.325D+00, 0.158D-02, 0.287D+00, 0.170D-02, 0.253D+00
 0.183D-02, 0.223D+00, 0.195D-02, 0.197D+00, 0.207D-02, 0.174D+00, 0.220D-02, 0.153D+00
 0.232D-02, 0.135D+00, 0.245D-02, 0.119D+00, 0.257D-02, 0.105D+00, 0.270D-02, 0.930D-01
 0.282D-02, 0.821D-01, 0.295D-02, 0.724D-01, 0.307D-02, 0.639D-01, 0.319D-02, 0.564D-01
 0.332D-02, 0.498D-01, 0.344D-02, 0.439D-01, 0.357D-02, 0.388D-01, 0.369D-02, 0.342D-01
 0.382D-02, 0.302D-01, 0.394D-02, 0.266D-01, 0.407D-02, 0.235D-01, 0.419D-02, 0.208D-01
 0.432D-02, 0.183D-01, 0.444D-02, 0.162D-01, 0.456D-02, 0.143D-01, 0.469D-02, 0.126D-01
 0.481D-02, 0.111D-01, 0.494D-02, 0.980D-02, 0.506D-02, 0.865D-02, 0.519D-02, 0.764D-02
 0.531D-02, 0.674D-02, 0.544D-02, 0.595D-02, 0.556D-02, 0.525D-02, 0.568D-02, 0.463D-02
 0.581D-02, 0.409D-02, 0.593D-02, 0.361D-02, 0.606D-02, 0.318D-02, 0.618D-02, 0.281D-02
 0.631D-02, 0.248D-02, 0.643D-02, 0.219D-02, 0.656D-02, 0.193D-02, 0.668D-02, 0.170D-02
 0.680D-02, 0.150D-02, 0.693D-02, 0.133D-02, 0.705D-02, 0.117D-02, 0.718D-02, 0.103D-02
 0.730D-02, 0.912D-03, 0.743D-02, 0.805D-03, 0.755D-02, 0.710D-03, 0.768D-02, 0.627D-03
 0.780D-02, 0.553D-03, 0.792D-02, 0.488D-03, 0.805D-02, 0.431D-03, 0.817D-02, 0.380D-03
 0.830D-02, 0.335D-03, 0.842D-02, 0.296D-03, 0.855D-02, 0.261D-03, 0.867D-02, 0.231D-03
 0.880D-02, 0.203D-03, 0.892D-02, 0.180D-03, 0.905D-02, 0.158D-03, 0.917D-02, 0.140D-03
 0.929D-02, 0.123D-03, 0.942D-02, 0.109D-03, 0.954D-02, 0.961D-04, 0.967D-02, 0.848D-04
 0.979D-02, 0.749D-04, 0.992D-02, 0.661D-04, 0.100D-01, 0.583D-04, 0.102D-01, 0.514D-04
 0.103D-01, 0.454D-04, 0.104D-01, 0.401D-04, 0.105D-01, 0.354D-04, 0.107D-01, 0.312D-04
 0.108D-01, 0.275D-04, 0.109D-01, 0.243D-04, 0.110D-01, 0.214D-04, 0.112D-01, 0.189D-04
 0.113D-01, 0.167D-04, 0.114D-01, 0.147D-04, 0.115D-01, 0.130D-04, 0.117D-01, 0.115D-04
**
*STEP
*DYNAMIC, EXPLICIT, DIRECT USER CONTROL
3.445899e-6 ,20.0E-3
*BULK VISCOSITY 
0.5, 
*SIMPEDANCE
INST.BOT,
*INCIDENT WAVE,PRESSUREAMPLITUDE=PRESSUREVTIME,PROPERTY=IWPROP
INST.BOT,0.710E6 
*OUTPUT, FIELD, NUMBER INTER=100
*NODE OUTPUT, NSET=INST.LEFT
POR, PABS 
*OUTPUT, HISTORY, TIME INTERVAL=2.0E-5
*NODE OUTPUT, NSET=INST.MASS
U2,V2,A2
*END STEP