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Skipping to Solution Controls, click "Equations" and deselect the Premixed Combustion and PDF options so that the only equations solved for are flow, swirl velocity, and turbulence as a preliminary solution. Press OK. 

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Go to Run Calculation. Click on "Data File Quantities" and select all of the mass fractions of species and the stream function (or click the button at the top right of the selection screen to select all if you would like to monitor other variables). Press OK.

Still on Run Calculation, enter 1000 under the number of iterations and run the simulation until it converges.

Now adapt a small region near the inlet with a progress variable of zero (denotes no combustion in this region , so that this region is will be entirely recalculated with combustion included):

Go to Adapt-Region at the menus at the top of the page. Select a small region near the inlet: X from 0.1 to 0.14m, Y from 0 to 0.03m. Click "Mark", which marks 207 cells for refinement, and then click "Close". 

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 Patch this region by going to Solution Initialization, and click "Patch". Select "Progress Variable" as the variable, and patch the region that you just marked by clicking "Patch". Close the dialogue after patching.

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Now go back to Solution Controls and click "Equations". Reselect the PDF and Partially Premixed Combustion options so that all options are highlighted and will be solved for. Press OK. In Solution Methods, make sure that all solvers (Momentum, Swirl Velocity, and Turbulent Kinetic Energy) are set to a second order solver scheme.

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