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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.
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https://confluence.cornell.edu/download/attachments/85624049/DupMesh_Full.png |
Rename the duplicate project to FlatPlate (mesh 2). You should have the following two projects in your Workbench Project Page.
Next, double click on the Mesh cell of the FlatPlate (mesh 2) project. A new ANSYS Mesher window will open. Under Outline, expand Mesh and click on Edge Sizing. Under Details of "Edge Sizing", enter 100 for Number of Divisions. Next set the number of divisions for Edge Sizing 2 and Edge Sizing 3 to 120. Then, click Update to create the new mesh. The new mesh should now have 12000 elements (100 x 1200). A quick glance of the mesh statistics reveals that there is indeed 12000 elements.
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https://confluence.cornell.edu/download/attachments/141036304/MeshStat1_Full.png |
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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.
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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.
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https://confluence.cornell.edu/download/attachments/141036304/runcalc2_Full.png |
Once you rerun the calculation, you will quickly see that the solution did not converge for the finer mesh within 1000 iterations. The solution should converge by the 1784th iteration as shown below.
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