{"id":253396,"date":"2023-03-10T12:17:39","date_gmt":"2023-03-10T12:17:39","guid":{"rendered":"\/forum\/forums\/topic\/problems-with-esel\/"},"modified":"2023-03-10T12:24:13","modified_gmt":"2023-03-10T12:24:13","slug":"problems-with-esel","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/problems-with-esel\/","title":{"rendered":"Problems with esel"},"content":{"rendered":"

Hello together,<\/p>\n

 <\/p>\n

I’m struggling a little bit with the element selection of in \/prep7-created thermal surface elements.<\/span><\/p>\n

The model is really simple a cube with convection load at the surfaces, except the top surface.<\/span><\/p>\n

 <\/span><\/p>\n

Model:<\/span><\/p>\n

Cube 10 mm x 10 mm x 10 mm<\/span><\/p>\n

\"\"<\/a><\/span><\/p>\n

208 nodes<\/span><\/p>\n

\"\"<\/a><\/span><\/p>\n

40 nodes on the top surface<\/span><\/p>\n

\"\"<\/a><\/span><\/p>\n

27 elements<\/span><\/p>\n

\"\"<\/a><\/span><\/p>\n

148 nodes at the exterior surface, except the top surface (I know the corner nodes)<\/span><\/p>\n

\"\"<\/a><\/span><\/p>\n

And 9 elements contain the nodes of the top surface<\/span><\/p>\n

\"\"<\/a><\/span><\/p>\n

The code for the creation of surf152 elements looks like:<\/span><\/p>\n

\/prep7<\/span><\/p>\n

\/GOPR  <\/span><\/p>\n

\/com,*********************Start surf152*********************<\/span><\/p>\n

   nsel,none<\/span><\/p>\n

   esel,none<\/span><\/p>\n

   esel,s,ename,,surf152         ! Element selection of surf152 elements<\/span><\/p>\n

   nsel,stat<\/span><\/p>\n

   esel,stat<\/span><\/p>\n

   cm,ELsurf152,elements         ! Create a component which includes surf152 elements<\/span><\/p>\n

   <\/span>nsel,stat<\/p>\n

   esel,stat<\/p>\n

   edele,ELsurf152               ! Deletion of former surf152 elements<\/span><\/p>\n

   nsel,stat<\/span><\/p>\n

   esel,stat<\/span><\/p>\n

   et,100,152,,,,,0              ! KEYOPT(5) = 0, No extra nodes. <\/span><\/p>\n

   cmsel,s,external,node         ! Select nodes for esurf<\/span><\/p>\n

   <\/span>nsel,stat<\/p>\n

   esel,stat<\/p>\n

   esln,s,0                      ! Select the elements of the selected nodes<\/span><\/p>\n

   <\/span>nsel,stat<\/p>\n

   esel,stat<\/p>\n

   type,100                      ! Asign element type 100<\/span><\/p>\n

   esurf                         ! Surface Elements generation<\/span><\/p>\n

   <\/span>nsel,stat<\/p>\n

   esel,stat<\/p>\n

   allsel,all<\/p>\n

\/com,*********************Ende surf152*********************<\/span><\/p>\n

\/solu<\/span><\/p>\n

 <\/span><\/p>\n

And the corresponding solver output is:<\/span><\/p>\n

          ***** ANSYS ANALYSIS DEFINITION (PREP7) *****<\/span><\/p>\n

 *********************Start surf152*********************<\/span><\/p>\n

 <\/span><\/p>\n

 NONE SELECT  FOR ITEM=NODE COMPONENT=    <\/span><\/p>\n

  IN RANGE         1 TO        208 STEP          1<\/span><\/p>\n

 <\/span><\/p>\n

          0  NODES (OF        208  DEFINED) SELECTED BY NSEL  COMMAND.<\/span><\/p>\n

 <\/span><\/p>\n

 NONE SELECT  FOR ITEM=ELEM COMPONENT=    <\/span><\/p>\n

  IN RANGE         1 TO        126 STEP          1<\/span><\/p>\n

 <\/span><\/p>\n

          0  ELEMENTS (OF         72  DEFINED) SELECTED BY ESEL  COMMAND.<\/span><\/p>\n

 <\/span><\/p>\n

 SELECT       FOR ITEM=ENAM COMPONENT=    <\/span><\/p>\n

  IN RANGE       152 TO        152 STEP          1<\/span><\/p>\n

 <\/span><\/p>\n

         45  ELEMENTS (OF         72  DEFINED) SELECTED BY  ESEL  COMMAND.<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF NODES ******<\/span><\/p>\n

 NUMBER OF SELECTED NODES=         0<\/span><\/p>\n

 NUMBER OF DEFINED NODES=        208<\/span><\/p>\n

 MAXIMUM NODE NUMBER=            208<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF ELEMENTS ******<\/span><\/p>\n

 NUMBER OF SELECTED ELEMENTS=        45<\/span><\/p>\n

 NUMBER OF DEFINED ELEMENTS=         72<\/span><\/p>\n

 MAXIMUM ELEMENT NUMBER=            126<\/span><\/p>\n

 <\/span><\/p>\n

 DEFINITION OF COMPONENT = ELSURF152  ENTITY=ELEM<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF NODES ******<\/span><\/p>\n

 NUMBER OF SELECTED NODES=         0<\/span><\/p>\n

 NUMBER OF DEFINED NODES=        208<\/span><\/p>\n

 MAXIMUM NODE NUMBER=            208<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF ELEMENTS ******<\/span><\/p>\n

 NUMBER OF SELECTED ELEMENTS=        45<\/span><\/p>\n

 NUMBER OF DEFINED ELEMENTS=         72<\/span><\/p>\n

 MAXIMUM ELEMENT NUMBER=            126<\/span><\/p>\n

 <\/span><\/p>\n

 *** WARNING ***                         CP =       0.547   TIME= 11:00:35<\/span><\/p>\n

 Assembly ELSURF152 is deleted.                                          <\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF NODES ******<\/span><\/p>\n

 NUMBER OF SELECTED NODES=         0<\/span><\/p>\n

 NUMBER OF DEFINED NODES=        208<\/span><\/p>\n

 MAXIMUM NODE NUMBER=            208<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF ELEMENTS ******<\/span><\/p>\n

 NUMBER OF SELECTED ELEMENTS=         0<\/span><\/p>\n

 NUMBER OF DEFINED ELEMENTS=         27<\/span><\/p>\n

 MAXIMUM ELEMENT NUMBER=            126<\/span><\/p>\n

 <\/span><\/p>\n

 ELEMENT TYPE        100 IS SURF152      3-D THERMAL SURFACE         <\/span><\/p>\n

  KEYOPT( 1- 6)=        0      0      0        0      0      0<\/span><\/p>\n

  KEYOPT( 7-12)=        0      0      0        0      0      0<\/span><\/p>\n

  KEYOPT(13-18)=        0      0      0        0      0      0<\/span><\/p>\n

 <\/span><\/p>\n

 CURRENT NODAL DOF SET IS  TEMP<\/span><\/p>\n

  THREE-DIMENSIONAL MODEL<\/span><\/p>\n

 <\/span><\/p>\n

 SELECT      COMPONENT EXTERNAL                        <\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF NODES ******<\/span><\/p>\n

 NUMBER OF SELECTED NODES=        16<\/span><\/p>\n

 NUMBER OF DEFINED NODES=        208<\/span><\/p>\n

 MAXIMUM NODE NUMBER=            208<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF ELEMENTS ******<\/span><\/p>\n

 NUMBER OF SELECTED ELEMENTS=         0<\/span><\/p>\n

 NUMBER OF DEFINED ELEMENTS=         27<\/span><\/p>\n

 MAXIMUM ELEMENT NUMBER=            126<\/span><\/p>\n

 <\/span><\/p>\n

 SELECT      ALL ELEMENTS HAVING ANY NODE IN NODAL SET.<\/span><\/p>\n

 <\/span><\/p>\n

          9 ELEMENTS (OF         27  DEFINED) SELECTED FROM<\/span><\/p>\n

       16 SELECTED NODES BY  ESLN COMMAND.<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF NODES ******<\/span><\/p>\n

 NUMBER OF SELECTED NODES=        16<\/span><\/p>\n

 NUMBER OF DEFINED NODES=        208<\/span><\/p>\n

 MAXIMUM NODE NUMBER=            208<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF ELEMENTS ******<\/span><\/p>\n

 NUMBER OF SELECTED ELEMENTS=         9<\/span><\/p>\n

 NUMBER OF DEFINED ELEMENTS=         27<\/span><\/p>\n

 MAXIMUM ELEMENT NUMBER=            126<\/span><\/p>\n

 <\/span><\/p>\n

 ELEMENT TYPE SET TO       100<\/span><\/p>\n

 <\/span><\/p>\n

 GENERATE ELEMENTS ON SURFACE DEFINED BY SELECTED NODES<\/span><\/p>\n

  TYPE=      100  REAL=        1  MATERIAL=        1  ESYS=    0<\/span><\/p>\n

 <\/span><\/p>\n

 NUMBER OF ELEMENTS GENERATED=          1                         <\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF NODES ******<\/span><\/p>\n

 NUMBER OF SELECTED NODES=        16<\/span><\/p>\n

 NUMBER OF DEFINED NODES=        208<\/span><\/p>\n

 MAXIMUM NODE NUMBER=            208<\/span><\/p>\n

 <\/span><\/p>\n

 ****** STATUS OF ELEMENTS ******<\/span><\/p>\n

 NUMBER OF SELECTED ELEMENTS=        10<\/span><\/p>\n

 NUMBER OF DEFINED ELEMENTS=         28<\/span><\/p>\n

 MAXIMUM ELEMENT NUMBER=            127<\/span><\/p>\n

 <\/span><\/p>\n

 SELECT ALL ENTITIES OF TYPE= ALL  AND BELOW<\/span><\/p>\n

 *********************Ende surf152*********************<\/span><\/p>\n

 <\/p>\n

Why are 45 elements selected via esel ?<\/span><\/p>\n

 <\/p>\n

\n

SELECT       FOR ITEM=ENAM COMPONENT=   
  IN RANGE       152 TO        152 STEP          1<\/p>\n

         45  ELEMENTS (OF         72  DEFINED) SELECTED BY  ESEL  COMMAND.<\/p>\n

 <\/p>\n

 <\/p>\n

There shouldn’be any surf152 elements because it’s the first step!<\/span><\/p>\n<\/div>\n

The output indicated that one surface element is created, I guess at the centre of the top surface. Because all external nodes of the element surface are necessary to create a surf152 element at the exterior element surface.<\/span><\/p>\n

\"\"<\/a><\/span><\/p>\n

After re-entering the \/solu I try to select the in \/prep7 created surf152 elements with this code:<\/span><\/p>\n

…<\/span><\/p>\n

  nsel,none<\/span><\/p>\n

  esel,none<\/span><\/p>\n

  esel,s,type,,100<\/span><\/p>\n

  esel,s,ename,,152<\/span><\/p>\n

  esel,s,mat,,100<\/span><\/p>\n

  cm,surf_test,elem<\/span><\/p>\n

 <\/span><\/p>\n

  allsel,all<\/span><\/p>\n

  outres,all,all<\/span><\/p>\n

*enddo<\/span><\/p>\n

 <\/span><\/p>\n

The solver output is this:<\/span><\/p>\n

 <\/span><\/p>\n

NONE SELECT  FOR ITEM=NODE COMPONENT=    <\/span><\/p>\n

  IN RANGE         1 TO        208 STEP          1<\/span><\/p>\n

 <\/span><\/p>\n

          0  NODES (OF        208  DEFINED) SELECTED BY NSEL  COMMAND.<\/span><\/p>\n

 <\/span><\/p>\n

 NONE SELECT  FOR ITEM=ELEM COMPONENT=    <\/span><\/p>\n

  IN RANGE         1 TO        126 STEP          1<\/span><\/p>\n

 <\/span><\/p>\n

          0  ELEMENTS (OF         72  DEFINED) SELECTED BY ESEL  COMMAND.<\/span><\/p>\n

 <\/span><\/p>\n

 *** WARNING ***                         CP =       0.797   TIME= 11:00:37<\/span><\/p>\n

 Entity 100 is undefined.  The ESEL command is ignored.                  <\/span><\/p>\n

 <\/span><\/p>\n

 SELECT       FOR ITEM=ENAM COMPONENT=    <\/span><\/p>\n

  IN RANGE       152 TO        152 STEP          1<\/span><\/p>\n

 <\/span><\/p>\n

         45  ELEMENTS (OF         72  DEFINED) SELECTED BY  ESEL  COMMAND.<\/span><\/p>\n

 <\/span><\/p>\n

 SELECT       FOR ITEM=MAT  COMPONENT=    <\/span><\/p>\n

  IN RANGE       100 TO        100 STEP          1<\/span><\/p>\n

 <\/span><\/p>\n

          0  ELEMENTS (OF         72  DEFINED) SELECTED BY  ESEL  COMMAND.<\/span><\/p>\n

 <\/span><\/p>\n

 DEFINITION OF COMPONENT = SURF_TEST  ENTITY=ELEM<\/span><\/p>\n

 <\/span><\/p>\n

 SELECT ALL ENTITIES OF TYPE= ALL  AND BELOW<\/span><\/p>\n

 <\/span><\/p>\n

 WRITE ALL  ITEMS TO THE DATABASE WITH A FREQUENCY OF ALL <\/span><\/p>\n

   FOR ALL APPLICABLE ENTITIES<\/span><\/p>\n

 <\/span><\/p>\n

 *ENDDO  INDEX= I                               <\/span><\/p>\n

 <\/span><\/p>\n

I don’t understand this, because one surf152 element is created in the \/prep7, but in the \/solu I can’t select it via esel.<\/span><\/p>\n

I also don’t understand why 45 surf152 are selected prior in the \/prep7 in the first step, there shouldn’t be any of these
<\/span><\/p>\n

 <\/span><\/p>\n

 <\/span><\/p>\n

With best regards<\/span><\/p>\n

John<\/span><\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-253396","topic","type-topic","status-closed","hentry","topic-tag-ansys-apdl","topic-tag-esel-1","topic-tag-pre-processing"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["191113","490"],"_bbp_author_ip":["23.192.164.14"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_bbp_likes_count":["1"],"_btv_view_count":["1962"],"_edit_lock":["1678450934:76812"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["253396"],"_bbp_forum_id":["27791"],"_bbp_engagement":["490","191113"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["253691"],"_bbp_last_active_id":["253691"],"_bbp_last_active_time":["2023-03-13 16:40:34"]},"test":"steffen-briermb-tu-chemnitz-de"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/253396","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":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/253396\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=253396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}