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Re: [ESPResSo-users] Increase the lattice boltzmann agrid but got error.

From: Axel Arnold
Subject: Re: [ESPResSo-users] Increase the lattice boltzmann agrid but got error.
Date: Wed, 27 May 2015 19:23:15 +0200


Just to add some more information:

The electrostatics algorithm used internally a complex FFT on real data, so that the result should be real as well. The code complains that it isn't, though the deviation is small. That typically means that there are strange charge distributions or parameters involved. If the simulation doesn't crash, then it is more likely a parameter problem (a finer agrid requires a smaller skin which might confuse the FFT).


Am 27.05.2015 um 10:05 schrieb Florian Weik <address@hidden>:

this is an error message from the P3M (Electrostatics). This is an indication that something else is wrong.
It would be easier to help you if you would post a minimal example that reproduces you problem. In principle
you should be able to change agrid.


On Wed, May 27, 2015 at 3:30 AM, Joe Ada <address@hidden> wrote:
Hi Guys,

I found that when I increase the agrid of LB fluidics, without changing anything else, I got the following error:
Complex value is not zero (i=16774,data="">
I wanted to increase the size of the simulation cube. Because of the limit of memory, I can only increase agrid. Is there a upper limit of it?


Florian Weik, Dipl.-Phys.,
Institut für Computerphysik, Allmandring 3, D-70569 Stuttgart
Phone: +49-711-685-67703
Public Key 0x0562F11D Fingerprint 3294 6360 EC93 37A3 BD40  F597 0BAD 3AF8 0562 F11D

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