Re: Re: [fluka-discuss]: Strange problems about the simulations

From: <yangt_at_ihep.ac.cn>
Date: Sun, 22 Sep 2019 10:01:34 +0800 (GMT+08:00)

Dear Ilaria,

Thanks for your suggestions, and I find the errors although they are very covert.

Best regards!

Yang.



-----原始邮件-----
发件人:"Maria Ilaria Besana" <maria.ilaria.besana_at_cern.ch>
发送时间:2019-09-20 16:44:26 (星期五)
收件人: "yangt_at_ihep.ac.cn" <yangt_at_ihep.ac.cn>
抄送: "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
主题: Re: [fluka-discuss]: Strange problems about the simulations


Dear Yang,


Flair shows different 2D views of the geometry.
In order to inspect your geometry, you need to move along it and look at these views in different positions, especially at boundaries.
In particular, if you set the origin at x = 0.67, y = 0.67, z = 21 in Flair you will see the error. You can see the screenshot attached.


Please note that a problematic geometry does not imply necessarily a crash, as I mentioned in my previous e-mail, and that the absence of crashes does not guarantee that your simulation is correct.


I recommend you to have a look at the slides of the FLUKA courses dedicated to geometry and geometry debugging:
https://indico.cern.ch/event/694979/contributions/2927099/


Best regards,
Ilaria










On 19 Sep 2019, at 18:17, yangt_at_ihep.ac.cn wrote:



Dear Ilaria,

    Thanks for your answers. however, flair doesn't find the error, but if the geometry has errors, why sometimes the simulations still obtain the needed and correct results (primary#=1E9)shown in figure in the last email? To my understanding, the simulation won't get any simulation results if it has a false geometry.Do you mean the program won't crash as long as the particles don't fall into the false geometry?

Best regards!

Yang.



-----原始邮件-----
发件人:"Maria Ilaria Besana" <maria.ilaria.besana_at_cern.ch>
发送时间:2019-09-19 22:50:11 (星期四)
收件人: "yangt_at_ihep.ac.cn" <yangt_at_ihep.ac.cn>
抄送: "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
主题: Re: [fluka-discuss]: Strange problems about the simulations

Dear Yang,


there are actually some errors in your geometry, which are the cause of the crash.
For example you have a superimposition of two regions at x = 0.67, y = 0.67, z = 21.
Please note that this type of errors does not cause an immediate crash, while the program stops immediately if a particle’s position does not belong to any region.


Best regards,
Ilaria




On 19 Sep 2019, at 08:19, yangt_at_ihep.ac.cn wrote:



Dear FLUKA users,

Recently I encounter a strange problem. attachments are my simulation files and results. in the beginning, all seems to right, but almost of the calculations fail(see "a4001.log" and it generates a huge size .out and .err file and in the beginningI see the primary particle increases with time,but at the end of 1st cycle the calculation will crash), however, a few of them will get the calculation results("a1001.log"). I check the geometry, and find no problem.If my input file exists problems, no results will be generated.




<1.png>


so what is the problem?




Best regards!




Yang.




<1.f><a.inp><a1001.log><a4001.log>




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Received on Sun Sep 22 2019 - 05:18:13 CEST

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