{"id":38604,"date":"2019-10-28T13:42:09","date_gmt":"2019-10-28T13:42:09","guid":{"rendered":"\/forum\/forums\/topic\/wrong-and-unexpected-value-of-pressure-contours-in-cfd\/"},"modified":"2019-10-28T13:42:09","modified_gmt":"2019-10-28T13:42:09","slug":"wrong-and-unexpected-value-of-pressure-contours-in-cfd","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/wrong-and-unexpected-value-of-pressure-contours-in-cfd\/","title":{"rendered":"Wrong and unexpected value of pressure contours in CFD."},"content":{"rendered":"

Hello everyone,<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

                         I am performing a study on projectile with the effect of suppressors. But when I apply the pressure value as inlet and view the contours I get different (extremely large) that I have given. I will provide the steps which I have performed.<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

1. I have made mesh and named selection for pressure inlet, pressure outlet and bullet_wall.<\/p>\n

<\/p>\n

2. The viscous model is K-epsilon, scalable wall function<\/strong>.<\/p>\n

<\/p>\n

3. On boundary condition, I have applied a pressure inlet value as a UDF (which was compiled and loaded).<\/p>\n

<\/p>\n

\"Pressure<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

4. Also left Pressure outlet as default one. Question: <\/strong>When I leave Guage pressure as 0 pascals, does it mean the outlet wall is of atmospheric pressure.<\/em>.<\/p>\n

<\/p>\n

\"Pressure<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

5. Then choose smoothing and remeshing; 6 DOF with one degree translation. Also, dynamic mesh zones has been defined. (No problem with dynamic mesh, it worked as I needed).<\/p>\n

<\/p>\n

\"\"<\/p>\n

<\/p>\n

6. Hybrid Initialization has been done and patched<\/strong> the whole region with pressure of 1.01e5 Pascal .<\/strong><\/p>\n

<\/p>\n

\"\"<\/p>\n

<\/p>\n

7. But when I open pressure contours I get to see that maximum pressure is 9.38 e9 <\/strong> pascals (But I guess it should be 3.75e8 Pa) but I cannot understand what’s going on.<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

Function governing the Pressure is 15000000*(t-5)*(t-5)<\/strong>.<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

I think I making mistakes in pressure inlets and outlet. I have also included schematic of analysis model.<\/p>\n

<\/p>\n

\"\"<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-38604","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["10782"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1481"],"_bbp_subscription":["236860"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["38604"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","158298"],"_bbp_voice_count":["2"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["97306"],"_bbp_last_active_id":["97306"],"_bbp_last_active_time":["2019-10-29 16:42:41"]},"test":"ananth-narayan"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/38604","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\/38604\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=38604"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}