*HEADING
 Basic verification for COUPLING option
 Test a uniform distributed load applied through the
 COUPLING option to a surface with underlying elements CPE4
*PREPRINT, MODEL=YES
*NODE
 1,   0.0, 0.0
 2,   1.0, 0.0
 3,   3.0, 0.0
 4,   6.0, 0.0
 5,   0.0, 1.0
 6,   1.0, 1.0
 7,   3.0, 1.0
 8,   6.0, 1.0
 9,   0.0, 3.0
10,   1.0, 3.0
11,   3.0, 3.0
12,   6.0, 3.0
13,   0.0, 6.0
14,   1.0, 6.0
15,   3.0, 6.0
16,   6.0, 6.0
17,   0.0,10.0
18,   1.0,10.0
19,   3.0,10.0
20,   6.0,10.0
*ELEMENT, TYPE=CPE4, ELSET=EALL
 1, 1,2,6,5
*ELGEN, ELSET=EALL
 1, 3, 1, 1, 4, 4, 3
*SOLID SECTION, MATERIAL=ELASTIC, ELSET=EALL
*MATERIAL, NAME=ELASTIC
*ELASTIC
 30.0e6,0.3
*SURFACE, NAME=LSURFACE
  1, S4
  4, S4
  7, S4
 10, S4
*NODE, NSET=NREF
 9999, -1, 5.0
*COUPLING, CONSTRAINT NAME=LOAD_DISTRIBUTOR, SURFACE=LSURFACE, REF NODE=NREF
*DISTRIBUTING, WEIGHT=UNIFORM
*BOUNDARY
  4, 1,2
  8, 1,1
 12, 1,1
 16, 1,1
 20, 1,1
  1, 2,2
  2, 2,2
  3, 2,2
*STEP
 Apply uniform load
*STATIC
 ,1.0
*CLOAD
 NREF, 1, 2000.0
*EL PRINT, FREQ=10000
 S
*NODE PRINT, FREQ=10000
 U, RF
*NODE FILE, FREQ=10000
 U, RF
*OUTPUT, FIELD, FREQ=1000
*NODE OUTPUT
 U, RF
*END STEP