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Article #141

Non-Linear PDE,finite diff meth.

#141
From: solca1
Date: Thu, 30 Jul 1992 17:23
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Hello everyboby 

I'm working on Reaction-Transport equation of the type :

		a + b <-> c  with k1 -> , and k2 in <- direction as rate 
						       constant.

The PDE I get as usual :

dt(Ca(x,t))= D dx**2(Ca(x,t)) -k1Ca(x,t)Cb(x,t) + k2Cc(x,t)

where D=diffusion const, dt=Dt (now D as partial Differential operator)
      dx**2 = Dxx (second partial derivative in x) .
      Ca(x,t) space-time concentration of specie A ,Cb the same for b .....

 
Naturally you get the same pdes for Cb(x,t) and Cc(x,t) with little changes.
I have a system of three non-linears PDEs which must solved simultanously .

I have made a simulation on a Cellular Automata of this reaction-transport
process and I'm interested in a numerical solution too. I have planed to use 
finite difference method to solve this system of PDE's .The problem is, 
must I first do a linearization of the system or  can I simply use the usual 
algorithm for linear Pde. 
If, for instance, you have a linear pde , you use the implicit or the 
explicit scheme  . Now what happend if your pde is non-linear ,is a $
linearization obligatory or not ? In some books it is said that you can 
ungo this linearization, and in other the contrary is not said but 
nothing is said about ? If some body have some answers to my questions 
it  would be glad  of you to mail me .Thanks for any suggestion !!

					bye Jan .
      
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Path: arc1-ca.pugleaf.net!sparky!uunet!usc!wupost!gumby!yale!yale.edu!ira.uka.de!chx400!urz.unibas.ch!solca1
From: solca1@urz.unibas.ch
Newsgroups: sci.math.num-analysis
Subject: Non-Linear PDE,finite diff meth.
Message-ID: <1992Jul30.182305.34205@urz.unibas.ch>
Date: 30 Jul 92 18:23:05 MET
Organization: University of Basel, Switzerland
Lines: 38