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Shown below are the residual plot, energy dissipation contour of various rendering surface and the pathline in mid-width plane and the whole domain.
The solution were not converged enough for the flow to be fully developed. As demonstrated in a simulation later this semester, the contour of energy dissipation rate is quite sensitive to the convergence rate, thus nothing conclusive could be drawn from the solution.
To improve convergence, we can try modifying the mesh to reduce the number of cells in stagnation region.