Dear Yang,
I suggest you to use a plane as a border between two regions, so split
void region on several regions which has only one border surface, as it
already have been suggested:
http://www.fluka.org/web_archive/earchive/new-fluka-discuss/13362.html
Your several Void->Box borders, have become Void1->Box, Void2->Box,
Void3->Box, ..., Void6->Box with only one rectangular surface as a border.
Best regards,
Mikhail
On 25.03.2019 18:40, yangt_at_ihep.ac.cn wrote:
>
> Dear experts and users,
>
> Recently, I encounter a small problem with usrbdx area.
>
>
>
> As shown in the figure, void is a sphere region, box is a cubic
> region, and material filled in them is both vacuum.
>
> I select one-way current scoring and want to get the current per unit
> area. Assuming we don’t know in advance what is the concrete direction
> of particles entering the box, and then select the area equal to the
> contact area of void-> box, eg, the cubic surface area,
>
> the value of particle current per unit area is J1; however, in actual
> the particles’ direction may be perpendicular to one surface as the
> shadow section shown in the figure, if we choose this area as the
> contact area in usrbdx card and obtain the particle current/area equal
> to J2, now J1=1/6 J2, if we select the total surface area of box, we
> may underestimate the quantity current/area, so how should we choose
> the area?
>
> Best regards!
>
> Yang
>
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Received on Tue Mar 26 2019 - 20:32:03 CET