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It is necessary to check that the solution iterations have converged. Launch FLUENT by double clicking on Solution of the "suddenExpansion (mesh2)" project in the Workbench Project Page. After FLUENT launches, select Monitors > Residuals > Edit... and then Plot, as shown in the images below.
If the solution hasn't converged, one needs to run more iterations by selecting Run Calculation. You may want to increase the number of iterations. Ensure that you have a converged solution and save the project. Then, if you double-click on Results for mesh2 in the project page, you'll see that all results have been updated for the new mesh.
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