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docs:become [2020/04/22 23:02] pklapetek |
docs:become [2020/04/22 23:10] pklapetek [Summary] |
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| An important message is that | An important message is that | ||
| - | using the periodic approach for only a small number of repetitions does not work as it does not take into account the field on sides of the computational domain. For large number of periodic approach repetitions we get results that are same as analytical results. | + | using the periodic approach with only a small number of repetitions does not work as it does not take into account the field on sides of the computational domain. For large number of periodic repetitions we get results that are same as analytical results. |
| If we manually extend the computational domain and include all the apertures, results agree with the analytical results also for small number of apertures. See the technical explanation listed below for our reference. | If we manually extend the computational domain and include all the apertures, results agree with the analytical results also for small number of apertures. See the technical explanation listed below for our reference. | ||
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| This uses very similar geometry to our calculation (TSF source, periodic and CPML boundaries), | This uses very similar geometry to our calculation (TSF source, periodic and CPML boundaries), | ||
| so we can expect that there are not many additional potential error sources when comparing to our calculation. | so we can expect that there are not many additional potential error sources when comparing to our calculation. | ||
| - | |||
| - | First of all, error in the reference value (PEC reflection) is below 0.001 percent. This certainly | ||
| - | cannot affect our results. | ||
| Reflectance of the default metal for this particular voxel spacing and other settings is 0.983 | Reflectance of the default metal for this particular voxel spacing and other settings is 0.983 | ||
| Reflectanceof the fitted metal model is 0.9587. | Reflectanceof the fitted metal model is 0.9587. | ||
| Result from the Filmmetrics reflectance calculator is 0.9678, which is something in between. | Result from the Filmmetrics reflectance calculator is 0.9678, which is something in between. | ||
| - | This is probably also not the source of problem (however might be compared to reflectance | + | Finally, error in the reference value (PEC reflection) is below 0.001 percent. This certainly |
| + | cannot affect our results. | ||
| + | So, this all is probably also not the source of problem (however might be compared to reflectance | ||
| coming from FEM). | coming from FEM). | ||
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| ===== Summary ===== | ===== Summary ===== | ||
| + | |||
| + | So far the result is not the expected value, which needs to be investigated first. Many of the convergence studies, or studies of impact of different simulation settings on the results were performed already or could be easily re-run when this is more clear. | ||
| The sensitivity of 2D calculations results on the settings (computational domain size, time step, near-to-far field transformation, et.c) is in the order of few percent, the dominant effect of this uncertainty is the near-to-far field transformation. This does not affect the cases when these conditions are kept same in a series of calculations (so relative changes can be calculated with much higher accuracy), however it certainly affects the absolute values, e.g. when comparing a single calculation to completely different calculation or experimental data. | The sensitivity of 2D calculations results on the settings (computational domain size, time step, near-to-far field transformation, et.c) is in the order of few percent, the dominant effect of this uncertainty is the near-to-far field transformation. This does not affect the cases when these conditions are kept same in a series of calculations (so relative changes can be calculated with much higher accuracy), however it certainly affects the absolute values, e.g. when comparing a single calculation to completely different calculation or experimental data. | ||
docs/become.txt · Last modified: 2020/04/24 12:27 by pklapetek
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