{"id":29443,"date":"2018-06-07T13:07:07","date_gmt":"2018-06-07T13:07:07","guid":{"rendered":"\/forum\/forums\/topic\/cfx-phase-change-simulation-with-rgp-data-of-water\/"},"modified":"2018-06-07T13:07:07","modified_gmt":"2018-06-07T13:07:07","slug":"cfx-phase-change-simulation-with-rgp-data-of-water","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cfx-phase-change-simulation-with-rgp-data-of-water\/","title":{"rendered":"CFX Phase-Change simulation with RGP-Data of water"},"content":{"rendered":"<p>Hello dear Ansys Community,<\/p>\n<p><\/p>\n<p>I&#8217;m trying to setup a steady-state simulation with a phase change\/vaporization of water. Therefore I&#8217;m using a RGP file which contains all the information for the liquid and the vapour phase. The setup is very basic:<\/p>\n<p><\/p>\n<ul><\/p>\n<li>Heated straight pipe with a mass flow condition at the inlet and a static pressure condition at the outlet.<\/li>\n<p><\/p>\n<li>I created two independent new Materials; waterLIQ (Thermodynamic State: liquid) &amp; waterVAP (Thermodynamic State: gas) using my RGP file.<\/li>\n<p><\/p>\n<li>For the final Material I used the Homogeneous Binary Mixture adding the two materials together and linked the SATTable of the RGP file with it.<\/li>\n<p><\/p>\n<li>Heat Transfer: Total Energy inc. Viscous Work Term<\/li>\n<p><\/p>\n<li>Turbulence: SST<\/li>\n<p>\n<\/ul>\n<p><\/p>\n<p>Slover Control:<\/p>\n<p><\/p>\n<ul><\/p>\n<li>High Resolution<\/li>\n<p><\/p>\n<li>Turbulence Numerics: First Order<\/li>\n<p><\/p>\n<li>Timescale Control: Auto<\/li>\n<p><\/p>\n<li>Timescale Factor: 0.001<\/li>\n<p>\n<\/ul>\n<p><\/p>\n<p>In theory I want the water to flow in as a liquid and heat up to form a gaseous phase. Therefore I set up the waterLIQ as Equilibrium Fraction (1.0 at the Inlet) and the water VAP as Equilibrium Constraint. &#8211; Hope it is the right setting so far.<\/p>\n<p><\/p>\n<p>Unfortunately I&#8217;m struggeling with the simulation. As soon as the Temperature reaches the boiling Point of water I get the following message:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/02d861f1-58de-45c1-bdc8-a8cc00c06fa8\/8872cb8b-86ee-4b7a-a409-a8f800d53ff2_warning.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>The Total Pressue turns negative and forces other variables to clip. The simulation is also not converging. I tried to simulate only an one-phase flow using either only waterLIQ or waterVAP. Everything went fine and converged delivering the right results.<\/p>\n<p><\/p>\n<p>I hope somebody already did a phase-change simulation with RGP data and could help me somehow or at least give me some advice for the general setup (or point out some errors). Thank you!<\/p>\n<p><\/p>\n<p>Sergjo<\/p>\n","protected":false},"template":"","class_list":["post-29443","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["1612"],"_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","0","0","0","0"],"_btv_view_count":["1358"],"_bbp_subscription":["236164"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["29443"],"_bbp_forum_id":["27792"],"_bbp_engagement":["5120","156851"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["60892"],"_bbp_last_active_id":["60892"],"_bbp_last_active_time":["2018-07-24 23:46:01"]},"test":"seryoga"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/29443","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\/29443\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=29443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}