[FLASH-USERS] Disable particles

[Norbert Flocke]

Hi Po-Yu,

The +laser setup uses -without-unit=Particles, which means that the 
Particles unit is dissabled. What the laser uses is the Grid/GridParticles
routines to 'handle' particles. The rays from the laser are treated
as particles when moving them through the grid. So the particles unit is
different from the actual tools (sitting in the Grid unit) that are used 
to move the particles (in your case the rays) through the grid.

Best regards,
Norbert


On Tue, 18 Nov 2014, pchang wrote:

> Hi John,
> Yes. That's what I did also. More precisely, I tried two ways: (1)have 
> useParticles = .false.  in flash.par (2) have setup variable +laser which 
> automatically set -without-unit=Particles.
> I think in the log file, it shows "useParticles=F" just to show the run time 
> setting. So I believe the particle unit has been disable. And that's why it 
> doesn't make sense to me when I have an error about particle number when I 
> don't have the unit
>
> Best,
>
> Po-Yu
>
> On 11/18/2014 3:17 PM, John ZuHone wrote:
>> Hi Po-Yu,
>> 
>> Silly question, but in the flash.par, you set
>> 
>> useParticles = .false.
>> 
>> not
>> 
>> useParticles=F
>> 
>> correct?
>> 
>> Best,
>> 
>> John
>> 
>>> On Nov 18, 2014, at 3:13 PM, pchang <pchang at lle.rochester.edu> wrote:
>>> 
>>> Hi all,
>>> I am doing simulation for imploding cylindrical target using lasers. I am 
>>> using the hydrodynamics units and don't use the particles unit. In the 
>>> list of RuntimeParameters in the log file, I also have useparticles=F. So, 
>>> I believe I don't have the particles unit in the simulations. It works 
>>> fine when I have less than two laser beams. However, when I added more 
>>> beams, the simulation stopped and gave an error:
>>> 
>>> Overflow! Mesh PE           9 , gettingFrom           2 , recvCount 
>>> 8068 , max particles       10000
>>> DRIVER_ABORT: [gr_ptMove]: Insufficient space in particles communication 
>>> buffer: increase pt_maxPerProc
>>> 
>>> So, my questions are:
>>> 
>>> (1) I thought the particle unit was not used. Why did it consider the 
>>> number of max particles.
>>> (2) If I have to have the particle unit, when can I increase pt_maxPerProc 
>>> ? in the flash.par? or as setup variable?
>>> 
>>> Thank you,
>>> 
>>> Po-Yu
>>> 
>>> 
>>> -- 
>>> Po-Yu Chang
>>> Postdoc
>>> Fusion Science Center,
>>> Laboratory for Laser Energetics
>>> University of Rochester
>>> 250 East River Road
>>> Rochester, New York 14623
>>> Phone: (585) 273-5179
>>> FAX: (585) 275-5960
>>> pchang at lle.rochester.edu
>> 
>
>
> -- 
> Po-Yu Chang
> Postdoc
> Fusion Science Center,
> Laboratory for Laser Energetics
> University of Rochester
> 250 East River Road
> Rochester, New York 14623
> Phone: (585) 273-5179
> FAX: (585) 275-5960
> pchang at lle.rochester.edu
>