{"id":168837,"date":"2022-04-24T18:40:27","date_gmt":"2022-04-24T18:40:27","guid":{"rendered":"\/forum\/forums\/topic\/modelling-the-diffusion-and-dispersion-of-gas-methane-leaks-from-top-of-tanks-into-air\/"},"modified":"2022-05-13T12:53:40","modified_gmt":"2022-05-13T12:53:40","slug":"modelling-the-diffusion-and-dispersion-of-gas-methane-leaks-from-top-of-tanks-into-air","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modelling-the-diffusion-and-dispersion-of-gas-methane-leaks-from-top-of-tanks-into-air\/","title":{"rendered":"Modelling the diffusion and dispersion of gas (methane) leaks from top of tank(s) into air"},"content":{"rendered":"
\n
\n

Hello, <\/p>\n

I am new to CFD and the use of Ansys Fluent so I am struggling with a lot issues. <\/p>\n

Background info: The concept of my design is that, air upstream flows past 3 tanks in tandem of each other and of which one of the tanks is leaking methane gas from the top. The methane gas mixes (no reaction) with the surrounding air as it moves downstream, ultimately, I want to study the changes in the concentration of methane gas in air downwind with time.<\/p>\n

I have seen a lot of tutorials simulating flow past cylinders, during which they always cut of the solid cylinder from their fluid domain while the edges of the cut out cylinder serve as the cylinder walls. However, while designing my flow geometry, I did not cutting out the cylinder as I intend to use the cylinder solid body to serve as a flow zone in which I will insert my mass source (modelling the methane gas leak). While meshing the domain, I clearly defined the fluid body under fluid and the solid cylinder bodies under solid. I have already applied the species transport equations while selecting the air-methane gas mixture (no reacting), now my issues are:<\/p>\n

    \n
  1. In the Materials dialogue box, under fluid, what should I select there, air or the mixture of air and methane<\/li>\n
  2. In the cell zone conditions dialogue box, in setting up the source,, do I set the fluid body (under fluid) to just air or the mixture of air and methane gas? Also, my intention is to set up the mass source term under the solid cylinder body (under solid), but when I did, I only saw the energy term (I expect to see other terms like mass, momentum, etc..). My apologies if I am not clear with my questions, Find attached the screenshots of what I am talking about. If there is any less complicated way to achieve what I intend to achieve, I would appreciate it<\/li>\n
  3. Just as an extra, if you can also help me address the excessive zoom in of my fluent GUI, I will appreciate it, I have tried everything suggested in one of the threads on similar issues but can't seem to resolve it.<\/li>\n<\/ol>\n

    Please I need all the help I can in moving forward, thank you so much for your feedback.<\/p>\n

    \n
    \n
    \n\"Screenshot
    \n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-168837","topic","type-topic","status-closed","hentry","topic-tag-ansys","topic-tag-ansys-fluent","topic-tag-ansys-student","topic-tag-fluent","topic-tag-fluid-flow"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["2291"],"_bbp_likes_count":["0"],"_bbp_subscription":["254361"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["168837"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","254361"],"_bbp_voice_count":["3"],"_bbp_reply_count":["28"],"_bbp_last_reply_id":["212903"],"_bbp_last_active_id":["212903"],"_bbp_last_active_time":["2022-05-13 12:53:40"]},"test":"chiemezie-ilonzecolostate-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/168837","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\/168837\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=168837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}