{"id":318370,"date":"2023-11-20T02:43:11","date_gmt":"2023-11-20T02:43:11","guid":{"rendered":"\/forum\/forums\/topic\/energy-source-term-related-with-chemical-reaction-in-udf\/"},"modified":"2023-11-20T02:43:11","modified_gmt":"2023-11-20T02:43:11","slug":"energy-source-term-related-with-chemical-reaction-in-udf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/energy-source-term-related-with-chemical-reaction-in-udf\/","title":{"rendered":"Energy source term related with chemical reaction in UDF"},"content":{"rendered":"

Hello !<\/span><\/p>\n

I am now working on a problem involving chemical reaction using Fluent 19.2. While Fluent provides the method for modeling chemical reaction problems, I am trying to simulate the problem with Eulerian multiphase model by adding source term using UDF(DEFINE_SOURCE macro). But I have met several problems.<\/span><\/p>\n

Firstly, I am now referring to Section 14.8.2.1(Source Terms due to Heterogeneous Reactions) of the help document. In the part of heat transfer(14.8.2.1.4, figure shown below), the letter a in Ha term is subscript in Eq. (14.658) while in Eq. (14.660) it is superscript. Is there any difference between the two Ha terms in the two expressions ?<\/span><\/p>\n

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Secondly, I have selected the species transport model(as well as Eulerian multiphase model, 1 mixture phase and 2 pure phases), but not selecting any options related with chemical reaction. According to the help document, when non-premixed combustion model is selected, the energy equation solved is in the form shown in the figure below(Section 5.2.1.3)<\/span><\/p>\n

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Since I did not enable the above-mentioned model, is that mean the energy equation in my problem should be the form shown below(Section 5.2.1.1) ? In the dialogue of material property setting, it is found that the standard state enthalpy and reference temperature could be input, and I am wondering if the input value makes sense in my case.<\/span><\/p>\n

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Thirdly, to add energy source term related with chemical reaction manually using UDF, what is the term for the consumed phase? Is the formation enthalpy of the phase material should be included or just the sensible heat ?<\/span><\/p>\n","protected":false},"template":"","class_list":["post-318370","topic","type-topic","status-closed","hentry","topic-tag-define-source"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t