January 25, 2023 at 7:17 amFAQParticipant
The answer is stated in the Fluent User Guide: “If you have more than one species, you can specify mass sources for each individual species. There will be a total Mass source term as well as a source term listed explicitly for each species (for example, h2, o2) except the last one you defined. If the total of all species mass sources (including the last one) is 0, then you should specify a value of 0 for the Mass source, and also specify the values of the nonzero individual species mass sources. Since you cannot specify the mass source for the last species explicitly, ANSYS Fluent will compute it by subtracting the sum of all other species mass sources from the specified total Mass source. For example, if the mass source for hydrogen in a hydrogen-air mixture is 0.01, the mass source for oxygen is 0.02, and the mass source for nitrogen (the last species) is 0.015, you will specify a value of 0.01 in the h2 field, a value of 0.02 in the o2 field, and a value of 0.045 in the Mass field. This concept also applies within each cell if you use user-defined functions for species mass sources.”
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