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Re: [lammps-users] Testing the Kevin-Helmhotz instability with USER-SPH package
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Re: [lammps-users] Testing the Kevin-Helmhotz instability with USER-SPH package


From: "Diaz,Adrian" <adriandiaz@...1447...>
Date: Mon, 26 Jun 2017 01:17:17 +0000

Greetings,

your script did not specify box boundary type so it used the default periodic boundary conditions as shown in the manual:



A few particles seem to be getting through the bottom edge and are being re-mapped to the top.


From: Quang-Thinh Ha <qth20@...5214...>
Sent: Sunday, June 25, 2017 5:11:10 PM
To: lammps-users@lists.sourceforge.net
Subject: [lammps-users] Testing the Kevin-Helmhotz instability with USER-SPH package
 
Hi,

I am just playing around with LAMMPS - specifically the USER-SPH package. I am trying to create the Kevin-Helmhotz instability by having two flows in opposite direction with the SPH. The results is pretty close to what we should see (or so I hope), but if you can see at the top and bottom I have some particles somehow managed to penetrate the walls and get re-entried at the other end.

Video of the clip: https://goo.gl/ZsbMNF

In case the video clip is not clear enough, here is the phenomenom: https://goo.gl/eoxcya

Here is the script I used for this case: https://pastebin.com/grt1SJZc

Am I doing something wrong, even fundamentally? 

Thanks in advance for your time.

Quang