March 17, 2023 at 8:59 amFAQParticipant
I am having trouble getting a reaction for liquid droplet combustion case. I have set up a reacting mixture and defined the reaction. My N2 scalar is set to constraint and all others are set to “Transport Equation”. I have checked to make sure that the droplets are evaporating properly and they are. When I look for the reaction rate, the scalar does not exist, and no CO2 and H2O are being formed in the domain. My products are initialized to 0. There are two things that could be preventing the fuel from burning: 1. The products limiter is active (i.e. Eddy Dissipation Model Coefficient B is set to a value greater than 0.0 for one or all reactions). The products limiter is set to (-1.0) by default for both single and multistep reactions. Activating this parameter causes the reaction to be limited by the concentrations of products in the domain, ie: reaction can’t go ahead in regions of the domain where products are at zero (0.0) concentration. Setting this coefficient to -1.0 should remove this limit. 2. Check the â€œFluid Modelsâ€ Tab of the Domains form. The Reaction or Combustion Model option (under Heat Transfer & Turbulence) should be set to “Eddy Dissipation” (or other reaction options). If it is set to none, the reaction has been disabled for your reacting mixture. (Make sure that you check the Combustion Model settings for all your reactions! If you have more than 1 reaction, individual reactions can be disabled on the reaction form as well.)
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