[FLASH-USERS] Destroying particles

[Anshu Dubey]

On Wed, Sep 1, 2010 at 4:57 AM, Seyit Hocuk <seyit at astro.rug.nl> wrote:

> Thanks Anshu,
>
> What exactly did you mean by time history?
>

By time history I mean the trajectory of the particle. Once you set its
block number to NONEXISTENT, that particle will no longer be output. I am
not entirely sure how the post processing will behave if a particle tag
disappears mid-way through a run. I can think of ways of getting around it,
but you may not need them.

For sorting the partiles, do you mean re-tag them?
>
> There is a routine called Grid_sortPartilcles, it moves the particles with
invalid block number to the end of the array and updates the local count of
particles to those with valid block numbers.


> I will try to change the blocknumber instead and see if it helps.
>
> Kind regards,
> Seyit
>
>
>
> Anshu Dubey wrote:
>
>> One possibility if you don't need the time history is to set the
>> particles' block number to NONEXISTENT, and then sort the particles data
>> structure before you continue processing.
>>
>> On Tue, Aug 31, 2010 at 9:22 AM, Seyit Hocuk <seyit at astro.rug.nl <mailto:
>> seyit at astro.rug.nl>> wrote:
>>
>>    Dear Community,
>>
>>    I have a simple question, one that we discussed before, I think.
>>
>>    Here goes:
>>    If you have a certain amount of particles, and want to
>>    reduce/destroy some of them during simulation, what is the best
>>    approach to do this. I alwas was placing them outside the box
>>    (negative x,y,z-positions), however, this causes occasional
>>    crashes (coming from "pt_mapFromMeshWeighted" line 146), and
>>    running in debug mode already was showing this. I think that
>>    putting 0 mass is also not a good solution.
>>
>>    Is there any other way?
>>
>>    Kind regards,
>>    Seyit
>>
>>
>>
>>
>>
>>
>> --
>> Anshu Dubey
>> Associate Director and CS/Applications Group Leader
>> ASC/Flash Center
>> Fellow, Computation Institute
>> University of Chicago and Argonne National Laboratory
>> 773 834 2999 (office)
>> 312 420 0033 (mobile)
>> 773 834 3230 (fax)
>>
>
>


-- 
Anshu Dubey
Associate Director and CS/Applications Group Leader
ASC/Flash Center
Fellow, Computation Institute
University of Chicago and Argonne National Laboratory
773 834 2999 (office)
312 420 0033 (mobile)
773 834 3230 (fax)
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