*HEADING Acoustic test - 1D Problem, Transient; A 4m long tube; from left to right, a sound source, 3m is air, then 1m of a highly absorbent material, followed by a rigid termination. [AC3D6] *PREPRINT,ECHO=NO,HISTORY=NO,MODEL=NO ** *********************************************************** **To test different frequencies change the value here *Parameter f=100.0 T=1.0/f omega=2*3.14159*f ******************************* ** ** Mesh Generation ** *NODE, Nset=ODB_NSET 1, 0, 0, 0 401, 4, 0, 0 501, 0, 0, -2e-2 901, 4, 0, -2e-2 1001, 0, 2e-2, 0 1401, 4, 2e-2, 0 1501, 0, 2e-2, -2e-2 1901, 4, 2e-2, -2e-2 *NGEN,NSET=ALL 1,401 501,901 1001,1401 1501,1901 *NSET,NSET=SAMPLE,GENERATE 1,401,10 *NSET,NSET=LOAD 1,1001,1501,501 *ELEMENT,TYPE=AC3D6 1, 1, 1001, 2, 501, 1501, 502, 2, 2, 1001, 1002, 502, 1501, 1502, 3, 2, 1002, 3, 502, 1502, 503, 4, 3, 1002, 1003, 503, 1502, 1503, 5, 3, 1003, 4, 503, 1503, 504, 6, 4, 1003, 1004, 504, 1503, 1504, 7, 4, 1004, 5, 504, 1504, 505, 8, 5, 1004, 1005, 505, 1504, 1505, 9, 5, 1005, 6, 505, 1505, 506, 10, 6, 1005, 1006, 506, 1505, 1506, 11, 6, 1006, 7, 506, 1506, 507, 12, 7, 1006, 1007, 507, 1506, 1507, 13, 7, 1007, 8, 507, 1507, 508, 14, 8, 1007, 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1521, 1522, 43, 22, 1022, 23, 522, 1522, 523, 44, 23, 1022, 1023, 523, 1522, 1523, 45, 23, 1023, 24, 523, 1523, 524, 46, 24, 1023, 1024, 524, 1523, 1524, 47, 24, 1024, 25, 524, 1524, 525, 48, 25, 1024, 1025, 525, 1524, 1525, 49, 25, 1025, 26, 525, 1525, 526, 50, 26, 1025, 1026, 526, 1525, 1526, 51, 26, 1026, 27, 526, 1526, 527, 52, 27, 1026, 1027, 527, 1526, 1527, 53, 27, 1027, 28, 527, 1527, 528, 54, 28, 1027, 1028, 528, 1527, 1528, 55, 28, 1028, 29, 528, 1528, 529, 56, 29, 1028, 1029, 529, 1528, 1529, 57, 29, 1029, 30, 529, 1529, 530, 58, 30, 1029, 1030, 530, 1529, 1530, 59, 30, 1030, 31, 530, 1530, 531, 60, 31, 1030, 1031, 531, 1530, 1531, 61, 31, 1031, 32, 531, 1531, 532, 62, 32, 1031, 1032, 532, 1531, 1532, 63, 32, 1032, 33, 532, 1532, 533, 64, 33, 1032, 1033, 533, 1532, 1533, 65, 33, 1033, 34, 533, 1533, 534, 66, 34, 1033, 1034, 534, 1533, 1534, 67, 34, 1034, 35, 534, 1534, 535, 68, 35, 1034, 1035, 535, 1534, 1535, 69, 35, 1035, 36, 535, 1535, 536, 70, 36, 1035, 1036, 536, 1535, 1536, 71, 36, 1036, 37, 536, 1536, 537, 72, 37, 1036, 1037, 537, 1536, 1537, 73, 37, 1037, 38, 537, 1537, 538, 74, 38, 1037, 1038, 538, 1537, 1538, 75, 38, 1038, 39, 538, 1538, 539, 76, 39, 1038, 1039, 539, 1538, 1539, 77, 39, 1039, 40, 539, 1539, 540, 78, 40, 1039, 1040, 540, 1539, 1540, 79, 40, 1040, 41, 540, 1540, 541, 80, 41, 1040, 1041, 541, 1540, 1541, 81, 41, 1041, 42, 541, 1541, 542, 82, 42, 1041, 1042, 542, 1541, 1542, 83, 42, 1042, 43, 542, 1542, 543, 84, 43, 1042, 1043, 543, 1542, 1543, 85, 43, 1043, 44, 543, 1543, 544, 86, 44, 1043, 1044, 544, 1543, 1544, 87, 44, 1044, 45, 544, 1544, 545, 88, 45, 1044, 1045, 545, 1544, 1545, 89, 45, 1045, 46, 545, 1545, 546, 90, 46, 1045, 1046, 546, 1545, 1546, 91, 46, 1046, 47, 546, 1546, 547, 92, 47, 1046, 1047, 547, 1546, 1547, 93, 47, 1047, 48, 547, 1547, 548, 94, 48, 1047, 1048, 548, 1547, 1548, 95, 48, 1048, 49, 548, 1548, 549, 96, 49, 1048, 1049, 549, 1548, 1549, 97, 49, 1049, 50, 549, 1549, 550, 98, 50, 1049, 1050, 550, 1549, 1550, 99, 50, 1050, 51, 550, 1550, 551, 100, 51, 1050, 1051, 551, 1550, 1551, 101, 51, 1051, 52, 551, 1551, 552, 102, 52, 1051, 1052, 552, 1551, 1552, 103, 52, 1052, 53, 552, 1552, 553, 104, 53, 1052, 1053, 553, 1552, 1553, 105, 53, 1053, 54, 553, 1553, 554, 106, 54, 1053, 1054, 554, 1553, 1554, 107, 54, 1054, 55, 554, 1554, 555, 108, 55, 1054, 1055, 555, 1554, 1555, 109, 55, 1055, 56, 555, 1555, 556, 110, 56, 1055, 1056, 556, 1555, 1556, 111, 56, 1056, 57, 556, 1556, 557, 112, 57, 1056, 1057, 557, 1556, 1557, 113, 57, 1057, 58, 557, 1557, 558, 114, 58, 1057, 1058, 558, 1557, 1558, 115, 58, 1058, 59, 558, 1558, 559, 116, 59, 1058, 1059, 559, 1558, 1559, 117, 59, 1059, 60, 559, 1559, 560, 118, 60, 1059, 1060, 560, 1559, 1560, 119, 60, 1060, 61, 560, 1560, 561, 120, 61, 1060, 1061, 561, 1560, 1561, 121, 61, 1061, 62, 561, 1561, 562, 122, 62, 1061, 1062, 562, 1561, 1562, 123, 62, 1062, 63, 562, 1562, 563, 124, 63, 1062, 1063, 563, 1562, 1563, 125, 63, 1063, 64, 563, 1563, 564, 126, 64, 1063, 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760, 381, 1380, 1381, 881, 1880, 1881, 761, 381, 1381, 382, 881, 1881, 882, 762, 382, 1381, 1382, 882, 1881, 1882, 763, 382, 1382, 383, 882, 1882, 883, 764, 383, 1382, 1383, 883, 1882, 1883, 765, 383, 1383, 384, 883, 1883, 884, 766, 384, 1383, 1384, 884, 1883, 1884, 767, 384, 1384, 385, 884, 1884, 885, 768, 385, 1384, 1385, 885, 1884, 1885, 769, 385, 1385, 386, 885, 1885, 886, 770, 386, 1385, 1386, 886, 1885, 1886, 771, 386, 1386, 387, 886, 1886, 887, 772, 387, 1386, 1387, 887, 1886, 1887, 773, 387, 1387, 388, 887, 1887, 888, 774, 388, 1387, 1388, 888, 1887, 1888, 775, 388, 1388, 389, 888, 1888, 889, 776, 389, 1388, 1389, 889, 1888, 1889, 777, 389, 1389, 390, 889, 1889, 890, 778, 390, 1389, 1390, 890, 1889, 1890, 779, 390, 1390, 391, 890, 1890, 891, 780, 391, 1390, 1391, 891, 1890, 1891, 781, 391, 1391, 392, 891, 1891, 892, 782, 392, 1391, 1392, 892, 1891, 1892, 783, 392, 1392, 393, 892, 1892, 893, 784, 393, 1392, 1393, 893, 1892, 1893, 785, 393, 1393, 394, 893, 1893, 894, 786, 394, 1393, 1394, 894, 1893, 1894, 787, 394, 1394, 395, 894, 1894, 895, 788, 395, 1394, 1395, 895, 1894, 1895, 789, 395, 1395, 396, 895, 1895, 896, 790, 396, 1395, 1396, 896, 1895, 1896, 791, 396, 1396, 397, 896, 1896, 897, 792, 397, 1396, 1397, 897, 1896, 1897, 793, 397, 1397, 398, 897, 1897, 898, 794, 398, 1397, 1398, 898, 1897, 1898, 795, 398, 1398, 399, 898, 1898, 899, 796, 399, 1398, 1399, 899, 1898, 1899, 797, 399, 1399, 400, 899, 1899, 900, 798, 400, 1399, 1400, 900, 1899, 1900, 799, 400, 1400, 401, 900, 1900, 901, 800, 401, 1400, 1401, 901, 1900, 1901, *ELsEt,ELSET=CHANNEL,generate 1,600 *ELsEt,ELSET=ABSORB,generate 601,800 ** *NSET, NSET=INTERFACE 1301,1800,1801,301,302,801 *NSET, NSET=ODB_NSET ODB_NSET, INTERFACE *NSET, NSET=QA_TEST ODB_NSET ** ************************************************ ** ** ELEMENT PROPERTIES ** ** *SOLID SECTION,MATERIAL=AIR,ELSET=CHANNEL *SOLID SECTION,MATERIAL=ABSORB,ELSET=ABSORB ** ** *MATERIAL,NAME=AIR *DENSITY 1.21, *ACOUSTIC MEDIUM,BULK MODULUS 0.1424E6, ** ** *MATERIAL,NAME=ABSORB *DENSITY 1.21, *ACOUSTIC MEDIUM,BULK MODULUS 0.1424E6, *ACOUSTIC MEDIUM,VOLUMETRIC DRAG 1e4, ** *AMPLITUDE,NAME=SINE,DEF=PERIODIC 1,,0.0,0.0 -1.0,0,0,0 *STEP *DYNAMIC,EXPLICIT , ** ** Prescribe outward acceleration of 1e-2 at node LOAD. *CLOAD,AMP=SINE LOAD,8,-1E-2 ** *OUTPUT,FIELD,NUM=1 *NODE OUTPUT POR, *NODE OUTPUT,NSET=QA_TEST POR, ***OUTPUT,HISTORY,FREQ=10 ***NODE OUTPUT,NSET=ODB_NSET ** POR, *ENDSTEP