Wouldn't it be easiest to make the modifications in the input file?


On Dec 17, 2007, at 7:00 AM, guillaume.albouze wrote:

> Hi,
>
> I would like to make some modifications to reaction rates ( w_k
> divided by  a value  F ) and thermal & molecular diffusivities (Dth
> and Dk replaced by F.Dth and F.Dk respectively).
>
> I began looking for the reaction rates routine and was finally looking
> for a routine getNetProductionRates but I'm stuck !!! I'm lost !!! I
> finally don't know where to do my modifications.
>
> If someone has an idea, it would help me so much !!!
>
> Thanks a lot,
>
> Guillaume
>
>
>
>
> Yahoo! Groups Links
>
>
>

I'm starting to work on a major Cantera upgrade, including:

1. New capabilities
2. Better high-level documentation: user's manuals, for example, with
step by step directions describing how to solve various types of
problems.
3. Code that is cleaner and easier to read and understand
4. Maybe even a few new graphical apps, along the lines of MixMaster,
but most-likely working through your web browser

But this will only be possible with help!  The actual coding work
will be done mostly by members of the SourceForge.net Cantera
project.  I will also refer to this group as the Cantera Developers
Group, but it's just another name for the same group of people.

At present, the Developers Group has nine members, but we will lose
some soon, since some of the members have recently changed jobs, and
no longer work with reacting flow simulation or similar problems.

So we're going to need some more people willing to volunteer their
time to help us build a better Cantera, that we can then all use!

We're looking for people who can contribute in many different ways.
I'd like to find a few good:

1. C++ programmers
2. Python programmers
3. Application specialists: How can Cantera better serve YOUR field?
4. Graphics Programmers
5. and more.. Maybe you?

If you're interested in joining the development team. send a message
describing your experience, applications, sector (university,
government, industry, etc ) to dggoodwin@....  Or
recommend one of your colleagues and I'll talk to him/her!

Thanks
Dave

Harry Moffat                                             (w) (505) 844-6912
Nanoscale and Reactive Processes            (f)   (505) 844-8251
Sandia National Laboratories                                    hkmoffa@...
P. O. Box 5800-0836
Albuquerque, NM 87185-0836

Oops:  my sources tell me that the left-hand side on line 22 is
actually "e{i,j} = ...  "
(Thanks, Josh)

~Steven



On Oct 2, 2008, at 3:24 PM, Steven DeCaluwe wrote:

> Hi All,
>
> Just writing to report that I've caught and fixed an error in the m-
> file for 'rxnEqs' in cantera-1.7.0 for matlab.
>
> Lines 17 and 22 need to be replaced with:
>
> line 17:  e = kinetics_get(a.id,31,irxn);
>
> line 22: e = kinetics_get(a.id,31,irxn(i,j));
>
> Regards,
> Steven DeCaluwe
>

Hi All,

Just writing to report that I've caught and fixed an error in the m-
file for 'rxnEqs' in cantera-1.7.0 for matlab.

Lines 17 and 22 need to be replaced with:

line 17:  e = kinetics_get(a.id,31,irxn);

line 22: e = kinetics_get(a.id,31,irxn(i,j));

Regards,
Steven DeCaluwe

Cantera is undergoing a major upgrade, both in the code itself, and
in the documentation and web site.  As part of this, I'd like to
collect short texts from users (like you!) describing how you use
Cantera!  Anyone can contribute, and it can be a few sentences or a
few pages, with or without graphics or figures, as you like.  Many of
these will probably go on the new Cantera web site, if you give
permission to use your text.  (We do, however, reserve the right to
edit for style, length, etc. anything that goes on the web site.)  We
will also provide a repository where you can deposited and share your
original unedited text, if you like.)

We're interested in hearing from the full range of the user
community, from students using it in classes, to the instructors of
those classes, all the way up to "power users" incorporating Cantera
into their very big supercomputer codes.

And of course we want to hear from you in the middle too, who use it
to do short equilibrium calculations, or run flat flame simulations,
for example.

Hope to hear from many of you ! The easiest way to send it may be be
as an email attachment to a message to "dgg@...".

Dave

For now at least, please access the Cantera web site at
http://cantera.sourceforge.net/
instead of at the old (and maybe future) address www.cantera.org

Dave

Very good! The subversion repository is for the next major Cantera
version, which will be version 2.0.

So for now you should still use CVS and Cantera 1.7.x
I hope to have a functional version of Cantera 2.0 out soon - maybe in
a week or so. But let me warn you that the version in the subversion
repository you found is far from functional, and will only lead to
frustration if you try to use it at this point...

Dave



--- In cantera@yahoogroups.com, "Michael Lee" <melee.dev@...> wrote:
>
> Hello all,
> I was going to checkout the latest code from CVS, but I noticed that
there
> are now both a CVS and SVN repository. I did some searches and
couldn't find
> any communication on this list of the differences between the two. I
have
> made some modifications to Cantera and need to apply those to the latest
> version of the code. I would appreciate if someone could shed some
light on
> the following questions:
>
> Which one has the latest version of Cantera?
> Are they both being currently maintained?
> Is there a specific connection between the two (a commit in CVS is
identical
> to a commit in SVN)? This would help migrate my changes.
>
> Thanks,
>
> Michael Lee
>

The Combustion Symposium will be held in Montreal Canada next month.
I suspect this may be the largest concentration of Cantera Users in
one place in quite some time!

Unfortunately I won't be able to make it this year.   But if some of
you are interested in having some sort of Cantera event there on
Sunday (August 3), all that is needed is someone to organize it... It
could range from a purely social hour, to a workshop on "Combustion
Modeling with Cantera" (or something similar).  If I can be of
assistance, please let me know.

Dave

I use the MATLAB version of Cantera.  Is there a way to see/alter the
energy equation that is used by Cantera?  Thanks for the help.

I was wondering if there was a way to access the energy equation that
Cantera uses in MATLAB.  For my research I am studying combustion
within a porous inert media.
I would like to use Cantera to model the combustion but to do so I must
be able to access the energy/governing equations so that I can couple
the gas energy to the solid energy through a convection term.
Could someone please let me know if there is a way to access the energy
equation to make the appropriate modifications.  This kind of thing has
been done in the past in programs such as PREMIX.

If it can't be done does anybody know how I could use Cantera to model
this kind of situation?

Thanks in advance.

Adam

In the MATLAB toolbox how do you create premixed flame objects.  I see
a script that creates diffusion flames but nothing for premixed.
Thanks for the help.

Hi all,
   I am new to cantera.. Is there an updated manual for using cantera
with Fortran90. I looked at manual for Release 1.2, but it looks like
lot of feaures have changed
thanks
dinesh

Ich werde ab  20.06.2008 nicht im Büro sein. Ich kehre zurück am
14.07.2008.

Bitte wenden Sie sich mit fachlichen Fragen an Herrn Dr. Gödde, Tel 78673.
Fragen zur Abwicklung von Prüfaufträgen beantworten Ihnen gern die
Laborleiter Herr Rainer Herrmann, Tel 51975, und Herr Norbert Mayer, Tel
56065.

Hi
  I am also facing the same problem.. Did you get any solution?
thanks
dinesh

--- In cantera@yahoogroups.com, "thomas_hewitt" <thewitt@...> wrote:
>
>   As a new user, the first thing is to run demo.f90.
>    The equilibrate call doesn't work. My documentaion says the 2nd
> argument should be char*2, but the cantera module forces it to be an
> integer parameter value. In any case it claims (HP or TP) are
> unsupported pairs. I can run the demo program without the equilibrate
> call, with credible looking results otherwise.
>

Dear all, dear Dave,

I am doing some stagnation flow flame simulations using the prune
option, since there are series of flames to be studied.

Using the "prune" option it somtimes happens that th programe gets
into an endless cycle, removing a point, adding it again, removing it,
etc.

Is there any way to avoid this problem?
Thanks a lot!

Regards,

Burak

I already tried to use my model with Python/Cantera (with scipy) but
it crashes miserably: it is well known (to chemkin users at least)
that dassl is not a very robust ode solver. I resolved to keep using
Matlab/Cantera, except for multiphase equilibria, since the function
"mixture" works well in python but fails in matlab. Well, apart for
that, I find that the actual version of Cantera covers all the
heterogeneous catalytic applications, where one writes his own reactor
models.
Daniela

--- In cantera@yahoogroups.com, "Dave Goodwin" <dgoodwin@...> wrote:
>
> Is anyone in the group experienced in writing MATLAB MEX C/Matlab
interface code? If so,
> and if you are interested in putting in a lot of work for free...
see me about being the
> maintainer of the Cantera MATLAB toolbox.  I personally don't use
MATLAB, since I find that
> Python can do just about everything MATLAB can do, when supplemented
by packages like
> "scipy", "matplotlib" etc.
>
> So those of you who are MATLAB / Cantera users should talk among
yourselves, nominate
> someone to keep the MATLAB toolbox up to date, and then convince
him/her to do it...
>
> Dave
>

 

Hi,

i found this cool Cantera Toolbox for MatLab. I want to calculate a
combustion with this tool. But i have no idea how to start.

I know how to define a gas, set the temperature and the pressure,
define the elements. But dont know where to define the air/fuel ratio.
For example: a combustion with natural gas and a air
/fuel ratio (lambda) = 1.2

I did such calculation with other tools, but i am not sure how i have
to use this tool.

could somebody please help me ? does anyone got a good tutorial or
example. Maybe someone knows a good userguide for this tool.

Thanks in advance.

 
    

Once again, I must apologize for the long delay in approving posts
from new members. The purpose of this is only to detect spammers who
want to send the group members spam about the usual things - wonder
drugs, hair restorers, etc.

Unfortunately my natural professorial absent-mindedness has been
greatly accentuated in the last few months by some medications I have
to take (temporarily).  As a result, I often forget to look at the
list of pending messages until several weeks have gone by.  I think
Yahoo groups tend to be magnets for scammers.... When I check the
pending messages list, there is quite often one or two spam messages
that I delete so that you never see them

My suggestion: Try using the Forums at SourceForge.Net.   Just go to
www.cantera.org, select "SourceForge" and when the Cantera
SourceForge page comes up, select "Forums".  Let me know what you
think - is this an effective way to get your problems solved quickly?

Dave

I just re-compiled cantera from CVS with the latest version of Sundials
(2.3.0), but ran into some compatibility problems.

I compiled both sundials and cantera (using gcc 4.2.3) without errors,
but ran into problems once I was trying to run cantera:

E.g. running $ python <prefix>/demos/python/equilibrium/adiabatic.py

I get the following Error:

\Traceback (most recent call last):
   File "/opt/cantera-cvs/demos/python/equilibrium/adiabatic.py", line 7,
in <module>
     from Cantera import *
   File
"/opt/cantera-cvs/lib/python2.5/site-packages/Cantera/__init__.py", line
7, in <module>
     import _cantera
ImportError: /opt/cantera-cvs/lib/python2.5/site-packages/Cantera/_cantera.so:
undefined symbol: CVReInit


It appears that the compiler flag HAS_SUNDIALS in
<sourcedir>/cantera/Cantera/src/numerics/ODE_integrators.cpp was not
set correctly or was lost somewhere along the way.

Forcing version 2.3.0 by adding

#define HAS_SUNDIALS

in that file before the switch between CVode.cpp and
CVodesIntegrator.cpp fixes the problem.

-Ingmar-

Hello,

I have just begun to explore Cantera using Matlab, but cannot find any
real documentation on the topic.
This PDF www.aresinstitute.org/Cantera/cantera-cxx.pdf says that there
are similar papers for Fortran or Matlab. Does anyone know where to
get the Cantera matlab User's Guide?

Thanks in advance

Hello all,

I'm new to Cantera. I'm currently trying to model a combustor using
multiple reactors using Matlab. I can't seem to figure out how I would
incorporate a recycle reactor (ie. recycle a portion of a reactor
output back into the reactor).

Any help would be greatly appreciated. I'm using Cantera 1.7 with
Matlab 2007b.

Thank you,

Nanthan

I would like to simulate a simple diffusion flame. I read messages
about the example file (diffflame.m), but I couldn't find it.
  Could anybody please tell me where I can get it?
  Thank you for your help.

  Hyungrok

Hi again,

Is there a FlowReactor example available in c++?
Or are there any details available on how to use it?
Also, could someone please provide some help regarding recycling a
portion of a reactor exit back into the reactor. Any help in either c++
or Matlab will be greatly appreciated.

Thank you,

Nanthan

Hi all

I found two small bugs in the Python code and one probably in Numarray:

Python:
- elements.py: variable "mix" should be "s", mixed indentation (spaces
and tabs)
- stoich.py: in the __main__ section, GRI32 from Cantera.gases should
be imported.

Numarray:
It seems that PyArray_FromDims() erroneously decreases the reference
count of the global Py_None object in each call. If that function gets
called very often (about 1500-2000 times, which is the case in my
flamelet code), Python tries to deallocate Py_None, which of course
causes a rather brutal crash. A quick hack is to append
Py_INCREF(Py_None) to each of the PyArray_FromDims() calls, but I'm
not sure what side effects that might have and what else is going
wrong inside PyArray_FromDims.

Attached is a patch fixing these things.

HTH

Michael

Hi,

I'm looking for algorithms which allow to detect if a species is
aromatic and also indicates which atoms are part of a specific aromatic
structure. Does anybody has any open source which can do this?

Kevin