RE: [fluka-discuss]: USRYIELD two-way vs. one-way

From: <me_at_marychin.org>
Date: Mon, 10 Mar 2014 22:13:13 -0700 (PDT)

Brandon,
I would:
1. open the inp file(s) under FLAIR, iron out the red bits;
2. try first with USRBDX, which is much simpler and more obvious than USRYIELD;
3. try first with vacuum, so that we know exactly there is one crossing per
primary, and we decouple the problem from random walks.
:) mary

> On 10 March 2014 at 16:28 "REDDELL, BRANDON D. (JSC-EV511)"
> <brandon.d.reddell_at_nasa.gov> wrote:
>
>
> Attached is an input file to illustrate the problem I am having. I have an
> RPP region divided in half and looking at the forward and backward fluxes
> across the surface at the middle. When I run this simulation my proton and
> neutron distributions are exactly the same. Also, I am seeing similar
> phenomena with the USRBDX distributions. So, can someone please tell me what I
> am doing wrong here?
>
>
>
> Thanks,
>
> Brandon
>
>
>
>
>
> From: me_at_marychin.org [mailto:me_at_marychin.org]
> Sent: Sunday, March 09, 2014 8:46 PM
> To: fluka-discuss_at_fluka.org; REDDELL, BRANDON D. (JSC-EV511)
> Subject: Re: [fluka-discuss]: USRYIELD two-way vs. one-way
>
>
>
> Hi Brandon,
>
> Swapping the upstream and downstream regions generally would not produce the
> same results. Is there any corresponding symmetry of some sort in your set up?
>
> Cheers,
>
> mary
>
> > >
> > On 08 March 2014 at 05:35 "REDDELL, BRANDON D. (JSC-EV511)"
> > <brandon.d.reddell_at_nasa.gov <mailto:brandon.d.reddell_at_nasa.gov> > wrote:
> >
> > Hello,
> >
> >
> >
> > I recently performed a simulation and used the USRYIELD card to get the
> > double differential spectrum crossing a boundary defined by reg1 and reg2. I
> > swapped the upstream and downstream assignments in WHAT(4) and WHAT(5)
> > expecting different results to get both forward and backward estimates. I
> > got the same results in both cases. Can someone tell me if this is the
> > expected result? In the past, I was under the impression that it would give
> > me forward or backward double differential scoring and not just the total.
> >
> >
> >
> > I am aware that I can use USRBDX to do this same problem.
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Brandon
> >
> > >
>
>
>
Received on Tue Mar 11 2014 - 07:17:12 CET