I have followed your steps (including patching), and got the following results. I also set the gauge pressure at both pressure outlets to 0 Pa as per point 3 - /courses/wp-content/uploads/sites/2/2024/01/2041750.pdf. Mass flow rate exiting the chimney seems to have converged within around 5%, and the values are realistic. Contours and vector plots are much better and closer to expectation. However, residuals remain high. There is some reverse flow as pictured, could this potentially be causing convergence issues?
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