*Heading
AXISYMMETRIC TIRE-AIR INTERACTION
APPLY ADAPTIVE MESHING TO UPDATE FLUID
USED AS BASE STATE IN  am_tireair_ac3d20.inp
*Node
*Element, type=ACAX8
*Element, type=CAX8RH
*Elset, elset=AIR, generate
*Elset, elset=TIRE, generate
** Region: (Section-1-AIR:AIR)
*Elset, elset=_I1, generate
** Section: Section-1-AIR
*Solid Section, elset=_I1, material=AIR
1.,
** Region: (Section-2-TIRE:TIRE)
*Elset, elset=_I2, generate
** Section: Section-2-TIRE
*Solid Section, elset=_I2, material=RUBBER
1.,
**End Instance
*Nset, nset=AIR, generate
*Nset, nset=CENT
*Nset, nset=NOUT
*Nset, nset=SYMM, generate
*Nset, nset=TIRE, generate
*Elset, elset=AIR_S1, generate
*Elset, elset=AIR_S2, generate
*Elset, elset=LINER_S2, generate
*Elset, elset=LINER_S4, generate
*Nset, nset=_M14
*Nset, nset=_M15
*Elset, elset=Set-1, generate
*Elset, elset=air-el, generate
*Elset, elset=_LINER_S4, generate
*Elset, elset=_LINER_S2, generate
*Surface, type=ELEMENT, name=LINER
_LINER_S4, S4
_LINER_S2, S2
*Surface, type=ELEMENT, name=air
 air_S2, S2
 air_S1, S1
** Constraint: air-liner
*Tie, name=air_liner, adjust=yes
 air, liner
**
** MATERIALS
**
*Material, name=AIR
*Acoustic Medium
*Density
 0.0012,
*Material, name=RUBBER
*Density
 0.0011,
*Hyperelastic
100.,0.,0.
**
** INTERACTION PROPERTIES
**
*Surface Interaction, name=AIR_LINER
1.,
**
** BOUNDARY CONDITIONS
**
** Name: Disp-BC-1 Type: Displacement/Rotation
*Boundary
SYMM, 2, 2
** Name: Disp-BC-2 Type: Displacement/Rotation
*Boundary
CENT, 1, 1
** Name: Disp-BC-3 Type: Symmetry/Antisymmetry/Encastre
*Boundary
_M14, YSYMM
**Name: Disp-BC-4 Type: Symmetry/Antisymmetry/Encastre
*Boundary
_M15, XSYMM
** ----------------------------------------------------------------
**
** STEP: Step-1
**
*Step, name=Step-1, nlgeom, inc=200
*Static
0.1, 1., 1e-05, 1.
**
*ADAPTIVE MESH,ELSET=AIR-el,FREQ=1,MESH SWEEPS=20
*PRINT,ADAPT=YES
** LOADS
**
** Name: SURFFORCE-1   Type: Pressure
*Dsload
LINER, P, -1.5
**
** OUTPUT REQUESTS
**
*Restart, write, frequency=1
** FIELD OUTPUT: F-Output-1
**
*Output, field,freq=1
*NODE OUTPUT
 U,COORD
*ELEMENT OUTPUT
*Output, history,fre=1
*NODE OUTPUT,NSET=NOUT
 U
*El Print, freq=1
 S
 EE
 E
 IVOL,
 EVOL,
*Node Print, freq=1
 U
*End Step
******* step for frequency extraction.
*step
*frequency
10
*print
eigval
*end step
*step
*STEADY STATE DYNAMICS,interval=range
4.1,5.0,10
*RESTART,WRITE,FREQ=0
*CLOAD,load case=1
60,1,1,100
*CLOAD,load case=2
60,2,2,100
*OUTPUT, FIELD, FREQ=0
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=nout
u,
*END STEP
*step
*STEADY STATE DYNAMICS,SUBSPACE,interval=range
4.1,5.0,10
*CLOAD,load case=1
60,1,1,100
*CLOAD,load case=2
60,2,2,100
*OUTPUT, FIELD, FREQ=0
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=nout
u,
*END STEP
*step
*STEADY STATE DYNAMICS,DIRECT,interval=range
4.1,5.0,10
*CLOAD,load case=1
60,1,1,100
*CLOAD,load case=2
60,2,2,100
*OUTPUT, FIELD, FREQ=0
*OUTPUT,HISTORY
*NODE OUTPUT,NSET=nout
u,
*END STEP