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Verification & Validation
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Mesh Convergence
One way to check the accuracy of the simulation is to refine the mesh and re-run the simulation. The smaller the element in the mesh, the more accurate the simulation will be. The only drawback is longer computation time. To refine the mesh, insert Body Sizing on the specimen and set the element size to 0.003m001m. Also, enter 0.003m 002m for the element size in the Details of "Mesh". This will ensure both the shell and the specimen are meshed with 0.003m elements. The original mesh has 620 Elements and 4533 Nodes and the new mesh has 894 1600 Elements and 6152 11204 Nodes.
Shell Net Radiation at end step time (W) | Specimen Net Radiation at end step time (W) | | |
|---|---|---|
Original Mesh | 0.2015 | -0.19705 |
Refined Mesh | 0.20622 20344 | -0.19808 19812 |
The net radiation shows very little change as the number of elements is doubled. No further mesh refinement is need.
View Factor
The view factor is calculated for surface to surface radiation. Recall from the radiation equation in pre-analysis, this is an important parameter in computing the radiation between surfaces that are in the same enclosure.
It is difficult to analytically calculate the view factor for this model. Hence, we will use a simplified exercise to show the validity of ANSYS simulation. Proceed to the next step to compare the analytic and ANSYS results.
Go to Exercises