Hi,
I've put in a feature request on sourceforge.net to add this capability in
the near future.
I think it would be particular useful to add an additional flag also indicating
that the user really means this, as the negative orders means there will be a
singularity as the concentration goes to zero that must be addressed in some
manner.

Best wishes,
Harry


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
-----Original Message-----
From: cantera@yahoogroups.com [mailto:cantera@yahoogroups.com] On Behalf Of
usenechal
Sent: Thursday, November 20, 2008 6:41 AM
To: cantera@yahoogroups.com
Subject: [cantera] negative reaction-order

Hi,

in a well known 1-step reaction-mechanism from Westbrook and Dryer
(SIMPLIFIED REACTION MECHANISMS FOR THE OXIDATION OF HYDROCARBON FUELS
IN FLAMES, DOI: 10.1080/00102208108946970) i found a negative
reaction order for methane. When I try with

reaction( "CH4 + 2 O2 => CO2 + 2 H2O", [8.30000E+012, 0, 30],
order = " CH4:-0.3 O2:1.3")

in the cti-file I get:

Error: reaction order must be non-negative

Is it possible to bring such a reaction with into cantera?

best regards
ulf

P.S. looking forward to cantera-2.0 :)


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