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Analytical Solution
Import this csv file and compare it to the Fluent solution at t* = 0.010. You can see how to import a csv file into CFD-Post at 2:46 in the Numerical Results video from the 3D Steady Diffusion tutorial.
Mesh Refinement & Smaller Time-step
It is always a good habit to check that the mesh is refined enough. For example, you could use an element size that is half of what was used in the videos and compare the results.
For transient problems, often the time-step size is crucially important in obtaining an accurate solution. For example, in the image below, three different time-step sizes were used and three different results were obtained:
However, you will notice if you run the simulation with a time-step size of 1e-6, you will obtain the same results as with a time-step
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size of 1e-5.
| Note |
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The time-step size is highly dependent on the physics of the problem, so don't expect to be able to use the same time-step size for different physical problems. |
Validation
Under construction
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