It is very important that you take the time to check the validity of your solution. This section leads you through some of the steps you can take to validate your solution.
Let's repeat the solution on a finer mesh. For the finer mesh, we will increase the total number of elements(cells) by a factor of four. In order to accomplish this, we double the number of divisions on each section. Instead of modifying the project that was just created, we will duplicate it and modify the duplicate. In the Workbench Project Page right click on Mesh then click Duplicate as shown below.
https://confluence.cornell.edu/download/attachments/85624049/DupMesh_Full.png |
https://confluence.cornell.edu/download/attachments/141036304/MeshStat1_Full.png |
Close the ANSYS Mesher to go back to the Workbench Project Page. Under FlatPlate (mesh 2), right click on Fluid Flow (FLUENT) and click on Update, as shown below.
Now, wait a few minutes for FLUENT to obtain the solution for the refined mesh. After FLUENT obtains the solution, save your project.
In order to launch FLUENT double click on the Solution of the "Laminar Pipe Flow (mesh 2)" project in the Workbench Project Page. The new mesh has significantly more cells, thus it is likely that the solution did not converge to the tolerances we have previously set. Therefore, we will iterate the solution further, to make sure that the solution converges. In order to do so click on Run Calculation, set Number of Iterations to 1000 and click Calculate, as shown below.
https://confluence.cornell.edu/download/attachments/141036304/runcalc2_Full.png |
Now, the variation of the x component of the velocity will be plotted with the results of the original mesh to determine whether the solution is mesh converged. Set up a plot for the variation of the x component of the velocity along the outlet as was done in the solution section. Then load the XVelOutlet.xy file into the plot and generate the plot. You should obtain the following image.
https://confluence.cornell.edu/download/attachments/141036304/VelFinal_Full.png |
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