I am using:<\/p>\n
- \n
- Potential\/Electrochemistry<\/li>\n
- Electrolysis and H\u2082 Pump Model \/ Electrochemical Devices<\/li>\n
- Device type: Alkaline Electrolysis<\/strong><\/li>\n
- Multiphase formulation<\/li>\n
- Resolved MEA-layer modelling<\/li>\n
- Butler–Volmer electrochemical kinetics<\/li>\n
- 1 M KOH electrolyte<\/li>\n
- Operating temperature: approximately 333 K<\/li>\n
- Operating pressure: 1 atm<\/li>\n<\/ul>\n
Each of the four cells contains separate zones for:<\/p>\n
- \n
- Anode current collector<\/li>\n
- Anode flow channel<\/li>\n
- Anode porous transport layer\/GDL<\/li>\n
- Anode catalyst layer<\/li>\n
- Membrane<\/li>\n
- Cathode catalyst layer<\/li>\n
- Cathode porous transport layer\/GDL<\/li>\n
- Cathode flow channel<\/li>\n
- Cathode current collector<\/li>\n<\/ul>\n
The individual cells are intended to be connected electrically in series through bipolar connections:<\/p>\n
- \n
- Cell 1 cathode current collector ↔ Cell 2 anode current collector<\/li>\n
- Cell 2 cathode current collector ↔ Cell 3 anode current collector<\/li>\n
- Cell 3 cathode current collector ↔ Cell 4 anode current collector<\/li>\n<\/ul>\n
Only the two external surfaces are defined as the stack terminals:<\/p>\n
- \n
- External anode terminal<\/li>\n
- External cathode terminal<\/li>\n<\/ul>\n
The intended total stack voltage is initially 6 V<\/strong>, corresponding to approximately 1.5 V per cell<\/strong>.<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
The contact zones are named:<\/p>\n
\n\n\n\n\n\n\n\n\n\n\n\n\nbp12_contact\nbp23_contact\nbp34_contact<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\nHowever, Fluent repeatedly gives warnings such as:<\/p>\n
\n\n\n\n\n\n\n\n<\/div>\n\n\n\n\n\nWarning: Anode side is electrically connected with cathode side\n(cell2_anode_cc and cell1_cathode_cc)!\n\nWarning: Anode side is electrically connected with cathode side\n(cell3_anode_cc and cell2_cathode_cc)!\n\nWarning: Anode side is electrically connected with cathode side\n(cell4_anode_cc and cell3_cathode_cc)!<\/code>
After that I have defined the boundry condtions and started to solve. <\/pre>\nThe solution later becomes unstable and produces nonphysical currents and floating-point errors.<\/p>\n
Could you please clarify:<\/p>\n
- \n
- Does the resolved Alkaline Electrolysis model support a true multi-cell bipolar stack?<\/li>\n
- Are these electrical-connection warnings expected for series-connected cells?<\/li>\n
- How should the bipolar interfaces be defined?<\/li>\n
- Should I apply the total stack voltage, for example 6 V, or the individual cell voltage, for example 1.5 V?<\/li>\n
- Is there any Fluent stack tutorial or example available?<\/li>\n<\/ol>\n
Sincerly,<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"template":"","class_list":["post-461695","topic","type-topic","status-publish","hentry","topic-tag-electrolysis-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["461695"],"_bbp_subscription":["712359"],"_bbp_author_ip":[null],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["461695"],"_bbp_last_active_time":["2026-07-22 14:20:06"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_engagement":["1"],"_bbp_likes_count":["0"],"_btv_view_count":["26"],"application":["FLUENT"],"emailnotification":[null],"_bbp_topic_status":["unanswered"]},"test":"hasancelikcu-edu-tr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/461695","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\/461695\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=461695"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}