pulsed liqiud jet (pid & npe)

[nader nekoubin]

hello all,

I am working with two-phase.h, and I am trying to understand the example about pulsed liquid jet. However, I cannot understand the following commands.

  scalar pid[];
  foreach()
    pid[] = fmod(pid()*(npe() + 37), npe());
  boundary ({pid}); // not used for the moment
  view (camera = "iso",
	fov = 14.5, tx = -0.418, ty = 0.288,
	width = 1600, height = 1200);
  clear();
  draw_vof ("f");
#endif // 3D
  save ("movie.mp4");
}

event snapshot (t = 0.1; t += 0.1; t <= 3.8) {
  char name[80];
  sprintf (name, "snapshot-%g", t);
  scalar pid[];
  foreach()
    pid[] = fmod(pid()*(npe() + 37), npe());
  boundary ({pid});
  dump (name);
}

What is the meaning of pid and npe in the above commands? Also, what is the meaning of tx, ty and fov? How do they
arrange the camera in view?
Please guide me in this regard,

Best regards,
Nader

[Wojciech Aniszewski]

1. view.h, line 22:

* *tx*, *ty*: shifts the camera center point.

2. pid() - most likely the process id of current process (in context of MPI, of course).
3. npe() - most likely the total number of processes in a parallel run.

best
w

On Tue, Nov 27, 2018 at 04:53:38AM -0800, nader nekoubin wrote:
> hello all,
>
> I am working with two-phase.h, and I am trying to understand the example
> about pulsed liquid jet. However, I cannot understand the following
> commands.
>
> scalar pid[];

> foreach <http://basilisk.fr/Basilisk%20C#iterators>()

> pid[] = fmod(pid()*(npe() + 37), npe());

> boundary <http://basilisk.fr/Basilisk%20C#boundary-conditions> ({pid}); // not used for the moment
> view <http://basilisk.fr/src/draw.h#view> (camera = "iso",

> fov = 14.5, tx = -0.418, ty = 0.288,

> width = 1600, height <http://basilisk.fr/src/heights.h#height> = 1200);
> clear <http://basilisk.fr/src/draw.h#clear>();
> draw_vof <http://basilisk.fr/src/draw.h#draw_vof> ("f");#endif // 3D
> save <http://basilisk.fr/src/view.h#save> ("movie.mp4");
> }
>
>
> event <http://basilisk.fr/Basilisk%20C#events> snapshot (t = 0.1; t += 0.1; t <= 3.8) {
> char name[80];
> sprintf <http://man7.org/linux/man-pages/man3/sprintf.3.html> (name, "snapshot-%g", t);
> scalar pid[];
> foreach <http://basilisk.fr/Basilisk%20C#iterators>()

> pid[] = fmod(pid()*(npe() + 37), npe());

> boundary <http://basilisk.fr/Basilisk%20C#boundary-conditions> ({pid});
> dump <http://basilisk.fr/src/output.h#dump> (name);

> }
>
> What is the meaning of pid and npe in the above commands? Also, what is the meaning of tx, ty and fov? How do they
> arrange the camera in view?
> Please guide me in this regard,
>
> Best regards,
> Nader
>

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--
/^..^\ Wojciech (Wojtek) ANISZEWSKI ► Post-doctoral Researcher
( (••) ) [Fr: vôitek anichévsky] ► Sorbonne University
(|)_._(|)~ [Eng: voyteck aanishevsky] ► Institut ∂'Alembert
GPG key ► Web [English] https://tinyurl.com/y73t4xsg [old! 2015]
ID:AC66485E ► [Polish ] https://tinyurl.com/yckark7n [old! 2014]

[Antoon van Hooft]

Hallo nader,

Here as similar question is raised with regards to the meaing "pid[ ]" field:

https://groups.google.com/forum/#!searchin/basilisk-fr/pid%5B%5D%7Csort:date/basilisk-fr/dx9vJWqyK_c/OJC1PRVEDQAJ

pid() and npe() are macros defined in src/common.h and depend on how you compile/run the code.

As for the arguments to the "view" function. On the Basilisk website functions are often clickable as links that take you to their description/implementation. Please follow this link and report if it remains unclear.

Antoon

[nader nekoubin]

Dear Antoon,

I read your description about this issue and it helps me to understand the meaning of pid and npe. I really appreciate your help and guidance.

Unfortunately, the pid and npe are not clickable in the code I investigate. I also saw the view.h code, however I could not find the related links.

Best regards,

Nader

[nader nekoubin]

Hello Antoon,

Could you please explain about the meaning of pid and npe when employing snapshot?

for example:

event snapshot (t = 0.1; t += 0.1; t <= 3.8) {
  char name[80];
  sprintf (name, "snapshot-%g", t);
  scalar pid[];
  foreach()
    pid[] = fmod(pid()*(npe() + 37), npe());
  boundary ({pid});
  dump (name);
}

Best regards,
Nader

On Tuesday, 27 November 2018 16:48:03 UTC+3:30, Antoon van Hooft wrote: