Re: Digest for amrita-ebook@googlegroups.com - 4 Messages in 2 Topics

[Hans Hornung]

Thanks James.

Mattei, did you forget to attach the script or am I too dumb to find it?

Hans.

On Mon, Feb 27, 2012 at 11:28 PM, <amrita...@googlegroups.com> wrote:

  Today's Topic Summary

Group: http://groups.google.com/group/amrita-ebook/topics

• ray tracing [3 Updates]
• Ray tracing [1 Update]

 ray tracing

Hans Hornung <hgho...@gmail.com> Feb 27 12:57PM -0800  

One of my graduate students is doing some interesting work on acoustic
ray tracing in hypersonic flows. In particular, the region near the
stagnation point of a blunt body is of interest. So I did some
computations using Amrita. What he needs is X, Y, U, V and speed of
sound in the coarse and refined grids. Since the command flowout
stores this information and much more, there must be a way of
extracting all of what he needs from one of the files .dstr or .solv.
We did it so far with just the coarse grid by using probe, but finer
resolution is needed near the shock for the ray tracing to behave
properly. Could anyone please help us with that?
 
Perhaps someone has already produced a script for acoustic ray
tracing.
 
Hans


 

James Quirk <j...@galcit.caltech.edu> Feb 27 01:17PM -0800  

Hans,
 
On Mon, 27 Feb 2012, Hans Hornung wrote:
 
> sound in the coarse and refined grids. Since the command flowout
> stores this information and much more, there must be a way of
> extracting all of what he needs from one of the files .dstr or .solv.
The attached script, run_get_flowfield, shows how to grab
the information you're after. It does this by compiling and running
a small FORTRAN fragment to loop over all the cells in AMR_SOL's
current solution field. Thus there is no need to access the .dstr and
.solv files, directly. You will still need to connect the dots,
as it were, but the attached will at least get ypu started.
 
James


 

Matei Radulescu <ma...@uottawa.ca> Feb 27 09:36PM  

Hans,
Gary Sharpe, Carlos Leung and myself have done something simpler for
1D detonation dynamics, where we integrated the location of the C+, C- and
C0 characteristics. Gary implemented this by integrating the
characteristic relations using a first order Euler in time and first order
interpolation in space.
I have attached our script, see the fold close to line 189.
Matei
________________________________________
From: amrita...@googlegroups.com [amrita...@googlegroups.com] on behalf of Hans Hornung [hgho...@gmail.com]
Sent: Monday, February 27, 2012 3:57 PM
To: amrita-ebook
Subject: ray tracing
 
One of my graduate students is doing some interesting work on acoustic
ray tracing in hypersonic flows. In particular, the region near the
stagnation point of a blunt body is of interest. So I did some
computations using Amrita. What he needs is X, Y, U, V and speed of
sound in the coarse and refined grids. Since the command flowout
stores this information and much more, there must be a way of
extracting all of what he needs from one of the files .dstr or .solv.
We did it so far with just the coarse grid by using probe, but finer
resolution is needed near the shock for the ray tracing to behave
properly. Could anyone please help us with that?
 
Perhaps someone has already produced a script for acoustic ray
tracing.
 
Hans
 
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 Ray tracing

Hans Hornung <hgho...@gmail.com> Feb 27 11:31AM -0800  

One of my graduate students is doing some interesting work on acoustic ray
tracing in hypersonic flows. In particular, the region near the stagnation
point of a blunt body is of interest. So I did some computations using
Amrita. What he needs is X, Y, U, V and speed of sound in the coarse and
refined grids. Since the command flowout stores this information and much
more, there must be a way of extracting all of what he needs from one of
the files .dstr or .solv. We did it so far with just the coarse grid by
using probe, but finer resolution is needed near the shock for the ray
tracing to behave properly. Could anyone please help us with that?
 
Perhaps someone has already written a script to do ray tracing within
Amrita?


 

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[James Quirk]

Hans,

On Wed, 29 Feb 2012, Hans Hornung wrote:

> Thanks James.
>
> Mattei, did you forget to attach the script or am I too dumb to find it?
>
> Hans.
>

It's possible that Matei's attachment was stipped off in the
digest you received. If so, you can grab a copy from:

http://groups.google.com/group/amrita-ebook/browse_thread/thread/5b3519cf23eaf16f

James