{"id":167511,"date":"2022-03-19T23:26:02","date_gmt":"2022-03-19T23:26:02","guid":{"rendered":"\/forum\/forums\/topic\/problem-with-hydrogen-mass-fraction-in-pem-fuel-cell-model\/"},"modified":"2022-03-22T12:30:18","modified_gmt":"2022-03-22T12:30:18","slug":"problem-with-hydrogen-mass-fraction-in-pem-fuel-cell-model","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/problem-with-hydrogen-mass-fraction-in-pem-fuel-cell-model\/","title":{"rendered":"Problem with Hydrogen mass fraction in PEM Fuel Cell model."},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello,<\/p>\n<p>I am doing a project on CFD simulation of a PEM fuel cell. The main goal of the project is to simulate and verify the results of the fuel cell with what is already present in literature. <\/p>\n<p>The model that I am currently simulating runs in the transient mode and I get fairly good residual curves after simulating the model for 10 time steps with a step size of 1e-09 and 30 iterations per time step. The problem that I am having is that after the simulation is done, the contours of the hydrogen mass fraction on the anode side show a constant value. In reality the hydrogen mass fraction has to decrease as we approach the anode outlet. Additionally, the min_h2 and mean_h2 are the exact same value as the simulation progresses which doesn&#039;t seem correct.<\/p>\n<p>I have no idea where the problem is. I have double-checked my inputs with what is in the literature and there is very little difference however I still don&#039;t know why the hydrogen mass fraction doesn&#039;t change.<\/p>\n<p>I would like to know if anyone has encountered such problem or know what is causing this issue?<\/p>\n<p>Any is help is very much appreciated.<\/p>\n","protected":false},"template":"","class_list":["post-167511","topic","type-topic","status-closed","hentry","topic-tag-fluent","topic-tag-fuel-cell-1","topic-tag-pem-1","topic-tag-pemfc","topic-tag-pemfc-add-on"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["496"],"_bbp_likes_count":["0"],"_bbp_subscription":["241057"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["167511"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","241057"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["208978"],"_bbp_last_active_id":["208978"],"_bbp_last_active_time":["2022-03-22 12:30:18"]},"test":"amirrajabi_2008yahoo-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/167511","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\/167511\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=167511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}