I have been trying to get sustained combustion in ANSYS using the Species Transport Model and Finite Rate Mechanism. However, even when i manage to get ignition the flame eventually dies out. I'm using the following boundary conditions:
Inlet : velocity inlet of Methane at room Temperature.
Free air flow in the surroundings at room temperature.
Initially the domain has air and methane comes in at room temperature. I can add a high temperature zone to get ignition and once i remove that high temperature zone the flame goes out.
If anyone can guide me on how to sustain this flame to mimic actual experiments where once ignition is achieved the flame is sustained. Thanks.
1. Open ANSYS Fluent in your computer. In the main Fluent window, select "Model" tab and then choose "Species Transport Model". Select the appropriate species model option if it is not already selected.
2. After selecting the species model, you need to enable the Finite Rate Reaction (FRS) from the Property Tab.
3. Once the FRS is enabled, you will be able to access the Reaction Setup Panel. From here, you need to enter the composition of the fuel that you are using. This could be made up of several components such as methane, CO2, and O2.
4. Once the composition is entered, you need to set up the Reaction Rate Coefficients. Depending on your application, there could be several reaction rate coefficients that you need to set.
5. Finally, you need to set up the species transport relationship. This should be based on the transport properties of the species involved in the reaction. Once the species transport and FRS model setup is complete, you should be able to get the methane burner fire in ANSYS Fluent.
Hi Mostak, Thank you for your response. I have been using Chemkin defined reaction rate for Finite Rate Kinetics. So i haven't been changing the coeffcicients and simply using the values defined by chemkin. However the problem is that even after getting ignition the flame dies out in subsequent iterations and if add too much energy to get ignition the solution diverges. Not really sure how to get around this problem.
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