Lysmer-Kuhlemeyer

Lysmer-Kuhlemyer Boundary Condition

FEAP has a very basic element for creating non-reflecting boundary conditions, based upon the classic paper "Finite dynamic model for infinite media", by J. Lysmer and R.L. Kuhlemeyer, J. Eng. Mech, ASCE, vol 4, August 1969, 859-877. See the manual and the file elements/acousticnd/lysmerabc.f for further details.

FEAP ** LABC example **
0 0 0 2 2 4

MATErial 1
 SOLId
  ELAStic isotropic 1000.0 0.1
  DENSity material  3000

MATErial 2
 LABC
  ELAStic isotropic 1000.0 0.1
  DENSity material  3000
  FACT labc 1 1

BLOCk
 CARTesian 10 10
 MATE 1
 1 0 0
 2 1 0
 3 1 1
 4 0 1

BLOCk
 CARTesian 10
 MATE 2
 1 1 0
 2 1 1

CSURface
 DISPlacement 1
 LINE
  1 0 1  .01
  2 0 0  .01

EBOUndary
 1 0.0  1 0

END

TIE

BATch
 PROPortional,,1
END
2 1
0.0  0.0
0.1  0.25
0.2  0.5
0.3  0.75
0.4  1.0
100  1.0


BATCh
 DT,,0.1
 TRANsient,NEWMark
 MASS,LUMPed
 PLOT,RANGe,0.0,0.01
 LOOP,,30
  TIME
  LOOP,,4
    TANGent,,1
  NEXT
  PLOT,CONTour,1
 NEXT
END

INTEractive

STOP