I am evaluating the electron beam irradiation on water by inserting 5 dosimeters evenly taped to the surface of the water container surface, as shown in the following figure.
The dosimeters are set to be tangent to the container cover plate, everything is okay except for the surface of that plane, where the error points are shown in the following figure.
Do you have any experience to eliminate the errors? Also attached the input and flair files here. tiwindow.inp (27.4 KB) tiwindow.flair (15.6 KB)
Thank you very much for your time.
Dear @xili
it appears there is an overlap in your geometry (two regions sharing the same portion of space). There are many ways of fixing it. One easy way (not always working but in your case it does) is the automatic “Correct E” function of flair.
Please watch this youtube video that shows how to correct your error.
To visualize your error you need to look in the other viewports
Thank you very much for your reply.
I think the version you showed in the video is the old one after I checked it for several times. This time I added 5 dosimeters that are like cylinders, which are tangent to the left surface of the cover plate, as shown in my last email.
I didn’t find any error until I check the dividers one by one and I found there are errors on the left plane of the cover plate. I think the errors shouldn’t be there but I couldn’t find the reason and how to correct them. I attached the input files again in case the old one confused anyone. tiwindow.inp (27.4 KB) tiwindow.flair (15.6 KB)
Could you please help check them? Appreciate your help.
It is very weird, I renamed my input file and flair file, but after uploaded they just showed the old names as my previous posts showed. Hopefully the content has been updated, please let me know if you don’t see the new version, where it should have something like the following (sorry for the many lines)
I see the “errors”, they are generated by the YCC cylinders and the spheres that are touching the COVER region. These are numerical precision errors in flair (despite all the work in flair to be numerical robust you cannot avoid such situations). Most probably they will be handled in a different way in fluka, either resulting in an error or not.
Its always a good practice as it explained in the fluka course geometry lecture to avoid such situations.
Various solutions are:
make the YCC and SPH a bit smaller in radius like a 1μm smaller
make it bigger forcing an overlap with the coverout plane and modify the region expression accordingly
Please note that from flair v3, the whole input is saved inside the .flair file, and it is exported to the .inp.
During loading in case flair detects that the .inp is modified outside .flair it will prefer the .inp and give you a warning message.