*HEADING Partial penetration of the element into the sea-bed: Elements tested: b21, b21h, b22, b22h, b23, b23h, b31, b31h, b32, b32h, b23, b33h *********** *********** ** Aqua parameters: ** ** Seabed - 0 ** Still water - 2 ** Steady current - (1,0,0) No depth variation ** Density - 1.99 ** Gravity const - 32.3 ** *AQUA 0., 2., 32.2, 1.99 1., 0., 0., 0. 1., 0., 0., 2. *********** *********** ** Wave parameters (airy): ** ** Wave amplitude - 0.1 ** Wave period - 10 ** Phase angle - 0 ** Wave direction - (1,0) ** *wave,type=airy,wave period .1,10.0,0.,1.,0.0 *********** *********** *NODE,nset=ntr 1, 0., 0., -1. 2, 0., 0., 1. 3, 0., 0., -1. 4, 0., 0., 1. 5, 0., 0., -1. 6, 0., 0., 0. 7, 0., 0., 1. 11, 0., -1. 12, 0., 1. 13, .0, -1. 14, .0, 1. 15, .0, -1. 16, .0, 0. 17, .0, 1. 21, 79.8, 0., -1. 22, 79.8, 0., 1. 23, 79.8, 0., -1. 24, 79.8, 0., 1. 25, 79.8, 0., -1. 26, 79.8, 0., 0. 27, 79.8, 0., 1. 31, 79.8, -1. 32, 79.8, 1. 33, 79.8, -1. 34, 79.8, 1. 35, 79.8, -1. 36, 79.8, 0. 37, 79.8, 1. *node 991,1. 992,1. 993,1. 994,1. 995,1. 996,1. 981,1. 982,1. 983,1. 984,1. 985,1. 986,1. *ELEMENT,TYPE=b31 1, 1,2 *element,type=b32 2, 5,6,7 *element,type=b33 3, 3,4 *ELEMENT,TYPE=b21 11, 11,12 *element,type=b22 12, 15,16,17 *element,type=b23 13, 13,14 *ELEMENT,TYPE=b31h 21, 21,22 *element,type=b32h 22, 25,26,27 *element,type=b33h 23, 23,24 *ELEMENT,TYPE=b21h 31, 31,32 *element,type=b22h 32, 35,36,37 *element,type=b23h 33, 33,34 *elset,elset=beams3d 1,2,3,21,22,23 *elset,elset=beams2d 11,12,13,31,32,33 *elset,elset=beams beams2d,beams3d *beam section,section=circ,material=mat1,elset=beams2d 1.0, 0.,0.,-1. *beam section,section=circ,material=mat1,elset=beams3d 1.0, 0.,-1.,0. *material,name=mat1 *elastic 1.e6, *mpc beam,1,991 beam,2,991 beam,3,993 beam,4,993 beam,5,992 beam,6,992 beam,7,992 beam,11,994 beam,12,994 beam,13,996 beam,14,996 beam,15,995 beam,16,995 beam,17,995 beam,21,981 beam,22,981 beam,23,983 beam,24,983 beam,25,982 beam,26,982 beam,27,982 beam,31,984 beam,32,984 beam,33,986 beam,34,986 beam,35,985 beam,36,985 beam,37,985 *BOUNDARY 991, 1,6 992, 1,6 993, 1,6 994, 1,6 995, 1,6 996, 1,6 981, 1,6 982, 1,6 983, 1,6 984, 1,6 985, 1,6 986, 1,6 ** ** Dummy mass element to define mass in the problem ** *ELEMENT,TYPE=MASS,ELSET=MASS 99, 9999 *MASS,ELSET=MASS 1., *amplitude,name=zero 0.,0., 1.e-6,0.0 *********************** *** S T E P 1 : Only drag loads *** Analytical result: RF = 0.995 i + 0 j + 0 k *STEP,inc=100 *static 1.e-10,1.e-10 *dload beams,fdd,,1.0,1.0,,,zero *NODE PRINT RF, *OUTPUT,FIELD *NODE OUTPUT RF, *END STEP *********************** *** S T E P 2 : Ramp down the drag load *step *static 1.e-10,1.e-10 *dload,op=new *endstep *********************** *** S T E P 3 : Inertial load ** Analytical result: RF = 0.389 i + 0 j + 0 k (peak) *STEP,inc=100 *dynamic .5,10.5,,.5 *dload beams,fi,,1.0,1.0,1.0 *END STEP