*HEADING 
EXPONENTIALLY DROPPING PLANE PRESSURE WAVE LOADING ON A MASS-SPRING-MASS 
SYSTEM FLOATING ON A COLUMN OF FLUID THAT CAN CAVITATE.  COMPARE THE ABAQUS
SOLUTION WITH THAT BY SPRAGUE AND GEERS (2001).  
CASE 3: M2/M1 = 5 
THIS ANALYSIS IS THE SUBMODEL ANALYSIS.
THE INPUT FILE '2-mass-5-1-global.inp' IS REQUIRED FOR THE GLOBAL ANALYSIS.
AFTER THE ANALYSIS IS DONE,
THE RESULTS NEED TO BE FIRST EXTRACTED WITH:
'abaqus convert=select job=2-mass-5-1-global'
THE SUBSEQUENT SUBMODEL ANALYSIS IS PERFORMED USING:
'abaqus job=2-mass-5-1-sub globalmodel=2-mass-5-1-global.fil' 
**
FLUID COLUMN DEPTH: 3.0M
ACOUSTIC ELEMENT HEIGHT = 2.5E-3M   I.E 1200 ELEMENTS. 
ACOUSTIC ELEMENT WIDTH = 0.01M 
ACOUSTIC ELEMENT THICKNESS = 1.0M
DRAFT OF THE FLOATING MASSES = 5.08M 
PATM = 0.101E6 PA.
**
*PREPRINT, MODEL=YES, HISTORY=YES
**
*PART,NAME=MODEL
*END PART
**
*ASSEMBLY,NAME=ASSEMBLY
**
*INSTANCE,NAME=INST,PART=MODEL
*NODE, NSET=MASS
4001, 0.0,   0.0
5001, 1.E-2, 0.0
6001, 0.0,   5.08
7001, 1.E-2, 5.08
*NSET, NSET=MASS1
4001, 5001
*NSET, NSET=MASS2
6001, 7001
*SURFACE, NAME=FLOAT
MASS, S1 
*ELEMENT, TYPE=CPS4R, ELSET=MASS
4001, 4001, 5001, 7001, 6001 
*SOLID SECTION, ELSET=MASS, MATERIAL=MASS
1.0
*ELEMENT, TYPE=MASS, ELSET=POINT_MASS
6001,6001
7001,7001
*MASS, ELSET=POINT_MASS
17.356667
*END INSTANCE
**
*SUBMODEL, ACOUSTIC TO STRUCTURE, ABSOLUTE=0.2, GLOBAL ELSET=ASSEMBLY.INST.FLUIDTOP
INST.FLOAT,
*SUBMODEL, ABSOLUTE=0.2, GLOBAL ELSET=ASSEMBLY.INST.MASS
INST.MASS2,
*END ASSEMBLY
**
*MATERIAL, NAME=MASS
*ELASTIC
21755536.0, 0.0
*DENSITY
341.6667
**
*BOUNDARY
INST.MASS, 1,1, 0.0
INST.MASS, 3,6, 0.0
*STEP
*DYNAMIC, EXPLICIT, DIRECT USER CONTROL
8.3333e-7 ,5.0E-3
*BULK VISCOSITY
0.5,
*BOUNDARY, SUBMODEL, STEP=1
INST.MASS1,8,8
INST.MASS2,2,2
*OUTPUT, HISTORY, FREQ=1
*NODE OUTPUT, NSET=INST.MASS
U2,V2,A2
*END STEP