{"id":436643,"date":"2025-07-11T21:51:13","date_gmt":"2025-07-11T21:51:13","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issues-with-modifying-official-ls-dyna-ex-with-s-ale-mesh\/"},"modified":"2025-07-14T13:36:12","modified_gmt":"2025-07-14T13:36:12","slug":"issues-with-modifying-official-ls-dyna-ex-with-s-ale-mesh","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issues-with-modifying-official-ls-dyna-ex-with-s-ale-mesh\/","title":{"rendered":"Issues with modifying official LS-DYNA ex with S-ALE mesh"},"content":{"rendered":"

<p>Hello, I would greatly appreciate some help regarding my code. I am taking an official LS-DYNA example, Underwater F (https:\/\/lsdyna.ansys.com\/underwater-f\/), and modifying it to create an S-ALE mesh without the cutout.<\/p><p>I am generating a square field. I fill the entire region with water and there is a smaller square region in the bottom left corner, in which I place an explosive material. I detonate the bottom left corner, the origin, at time 0.<\/p><p>However, the detonation front created by this explosion is not propagating smoothly into the water. It looks like there is a boundary at the box region, even though I have not defined a boundary. Might this be due to a discontinuity in the interface between the two materials or is there something I am missing in my code? How would I fix this? Thank you very much in advance.<br><br>Here is the input file:<\/p><div>*KEYWORD<\/div><div>*NODE<\/div><div>       1 0.000000000E+00 0.000000000E+00 0.000000000E+00<\/div><div>       2 0.000000000E+00 0.000000000E+00 0.000000000E+00<\/div><div>       3 0.100000000E+00 0.000000000E+00 0.000000000E+00<\/div><div>       4 0.000000000E+00 0.100000000E+00 0.000000000E+00<\/div><div>*ALE_STRUCTURED_MESH_CONTROL_POINTS<\/div><div>      1001<\/div><div>                   1       0.0<\/div><div>                  51       8.0<\/div><div>                 201      32.0<\/div><div>*ALE_STRUCTURED_MESH_CONTROL_POINTS<\/div><div>      1002<\/div><div>                   1       0.0<\/div><div>                  51       8.0<\/div><div>                 201      32.0<\/div><div>*ALE_STRUCTURED_MESH_CONTROL_POINTS<\/div><div>      1003<\/div><div>                   1       0.0<\/div><div>                   2       1.0<\/div><div>*DEFINE_COORDINATE_NODES<\/div><div>       234         2         3         4<\/div><div>*ALE_STRUCTURED_MESH<\/div><div>         7      5000     10000     10000<\/div><div>      1001      1002      1003         1       234     <\/div><div>*DEFINE_BOX<\/div><div>         9       0.0       8.0       0.0       8.0       0.0       1.0<\/div><div>*PART<\/div><div> <\/div><div>         1         1         1         1<\/div><div>*PART<\/div><div> <\/div><div>         2         2         2         2<\/div><div>*MAT_NULL<\/div><div>         1       1.0<\/div><div>*MAT_HIGH_EXPLOSIVE_BURN<\/div><div>         2      1.63     0.784     0.260 0.000E+00<\/div><div>*EOS_GRUNEISEN<\/div><div>         1       1.5<\/div><div> <\/div><div>*EOS_JWL<\/div><div>         2      3.71 3.230E-02      4.15     0.950     0.300 4.300E-02      1.00<\/div><div>*ALE_STRUCTURED_MULTI-MATERIAL_GROUP<\/div><div>     water         1         1<\/div><div>      expl         2         2<\/div><div>*ALE_STRUCTURED_MESH_VOLUME_FILLING<\/div><div>         7               water<\/div><div>       ALL<\/div><div>*ALE_STRUCTURED_MESH_VOLUME_FILLING<\/div><div>         7                expl<\/div><div>    BOXCOR         0         9<\/div><div>*CONTROL_ALE<\/div><div>         0         1         2      -1.0<\/div><div> <\/div><div>*CONTROL_ENERGY<\/div><div>         2         1         2         2<\/div><div>*INITIAL_DETONATION<\/div><div>      5000 0.000E+00 0.000E+00 0.000E+00 0.000E+00<\/div><div>*CONTROL_TERMINATION<\/div><div>     100.0<\/div><div>*DATABASE_BINARY_D3PLOT<\/div><div>       1.0<\/div><div>*DATABASE_GLSTAT<\/div><div>       0.1<\/div><div>*END<\/div><div> <\/div><div>Here are screenshots of the relevant time steps:<\/div><div>\"\"<\/div><div>\"\"<\/div><div>\"\"<\/div><div>\"\"<\/div><\/p>\n","protected":false},"template":"","class_list":["post-436643","topic","type-topic","status-answered","hentry","topic-tag-ale","topic-tag-Explosion-1","topic-tag-lsdyna","topic-tag-underwater-shockwave-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["436643"],"_bbp_author_ip":["71.179.15.164"],"_bbp_last_reply_id":["437470"],"_bbp_last_active_id":["437470"],"_bbp_last_active_time":["2025-07-22 16:22:27"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["572157"],"_btv_view_count":["244"],"_bbp_topic_status":["answered"],"_edit_lock":["1752500163:572157"],"_bbp_subscription":["523"]},"test":"e70e8cc42ca9c70bd83b8f98ebf17389fbd1db36"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/436643","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/436643\/revisions"}],"predecessor-version":[{"id":436724,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/436643\/revisions\/436724"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=436643"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}