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When running a MicroFlo simulation no lines appear on the graph and no results are produced?

If the solution hangs at the beginning of the simulation it means the solution has diverged rather than converged.

The solution diverges if you have a poor mesh so you should:

1) Improve the aspect ratio of your cells.
2) Add more cells close to the building.
3) Simplify your geometry as MicroFlo uses a Cartesian mesher so is best reserved for rectilinear geometries that align with the Cartesian mesh.