** acoustic mesh for air cavity
*Node,nset=AIR
     201,    0.2699594,  -0.05290701
     202,     0.296727,    -0.049605
     203,    0.2977845,  -0.04367401
     204,     0.299059,   -0.0365266
     205,    0.2672479,  -0.02907382
     206,      0.29421,   -0.0553866
     207,     0.279243,   -0.0749666
     208,     0.287125,    -0.066966
     209,      0.29257,   -0.0587286
     210,      0.30098,   -0.0201225
     211,     0.301976,           0.
     212,    0.2382352,           0.
     213,    0.2379618,   -0.0287547
     214,     0.266238,   -0.0832637
     215,     0.253453,   -0.0870777
     216,     0.240134,   -0.0880791
     217,     0.186383,           0.
     218,     0.226269,   -0.0848594
     219,     0.213787,   -0.0782998
     220,     0.201558,  -0.07135411
     221,     0.186383,   -0.0645597
     222,    0.2779461,  -0.05131477
     223,    0.2848475,  -0.04915184
     224,    0.2908484,  -0.04804121
     225,    0.2914148,  -0.03098039
     226,    0.2834301,   -0.0298983
     227,    0.2754909,   -0.0293623
     228,    0.2681189,  -0.04125624
     229,    0.2733724,  -0.06395093
     230,    0.2927306,           0.
     231,    0.2840563,           0.
     232,    0.2756929,           0.
     233,    0.2672368,           0.
     234,    0.2578675,           0.
     235,    0.2482569,           0.
     236,    0.2382639,  -0.01476598
     237,    0.2485186,  -0.02890033
     238,    0.2582257,  -0.02880233
     239,     0.237971,  -0.04247333
     240,    0.2386647,  -0.05687109
     241,    0.2395186,  -0.07190055
     242,    0.2265649,           0.
     243,    0.2137942,           0.
     244,    0.2003894,           0.
     245,     0.186383,  -0.01227678
     246,     0.186383,  -0.02445388
     247,     0.186383,  -0.03571038
     248,     0.186383,  -0.04530542
     249,     0.186383,  -0.05469438
     250,    0.2763402,     -0.04062
     251,     0.283895,  -0.04010932
     252,     0.290962,  -0.04076713
     253,    0.2908571,  -0.05264087
     254,    0.2814097,  -0.05953216
     255,    0.2874211,  -0.05501337
     256,     0.292208,   -0.0167295
     257,    0.2838061,  -0.01542597
     258,    0.2755299,  -0.01507607
     259,    0.2669982,  -0.01471376
     260,    0.2579207,  -0.01464963
     261,    0.2483793,  -0.01470385
     262,    0.2589271,  -0.04197757
     263,    0.2488828,  -0.04252848
     264,     0.260412,  -0.05505774
     265,    0.2498818,  -0.05646912
     266,    0.2628773,  -0.06839795
     267,    0.2514987,   -0.0711537
     268,    0.2265336,  -0.01425766
     269,    0.2138604,  -0.01357533
     270,     0.200183,  -0.01280665
     271,    0.2262115,  -0.02794749
     272,    0.2134313,  -0.02665322
     273,    0.2000733,  -0.02537994
     274,    0.2259124,  -0.04120363
     275,    0.2133014,  -0.03945866
     276,      0.20005,  -0.03739351
     277,    0.2261656,  -0.05493504
     278,    0.2133558,  -0.05211763
     279,    0.2000868,   -0.0487208
     280,    0.2264179,  -0.06922062
     281,    0.2135538,  -0.06496078
     282,    0.2004322,  -0.05996929
*Element, type=ACAX4
 201,  246, 272, 243, 217
 202,  272, 213, 212, 243
 203,  213, 238, 234, 212
 204,  238, 227, 232, 234
 205,  227, 225, 230, 232
 206,  225, 204, 211, 230
 207,  248, 278, 272, 246
 208,  278, 240, 213, 272
 209,  240, 264, 238, 213
 210,  264, 222, 227, 238
 211,  222, 224, 225, 227
 212,  224, 202, 204, 225
 213,  221, 219, 278, 248
 214,  219, 216, 240, 278
 215,  216, 214, 264, 240
 216,  214, 208, 222, 264
 217,  208, 206, 224, 222
*Element, type=ACAX3
 218, 206, 202, 224
*Elset, elset=air, generate
 201,  218,   1
*Nset, nset=air-rim
 217, 246, 248, 221 
*Nset, nset=air-Sym
 217, 243, 212, 234, 232, 230, 211
*Elset, elset=liner1
 213, 214, 215, 216, 217, 218
*Elset, elset=liner2
 206, 216
*Surface, name=air-liner
 liner1, S1
 liner2, S2
*Solid Section, elset=air, material=air
*Material, name=air
*Acoustic Medium
 .426E6,
*Density
 3.6,