Re: NDSolve
- To: mathgroup at smc.vnet.net
- Subject: [mg62392] Re: NDSolve
- From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
- Date: Wed, 23 Nov 2005 01:12:08 -0500 (EST)
- Organization: Uni Leipzig
- References: <dlkc4b$ppg$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi, NDSolve[] can not solve elliptic problems, you must use the time dependent solution and compute the limit t->Infinity Regards Jens "Uli Wuerfel" <uli.wuerfel at fmf.uni-freiburg.de> schrieb im Newsbeitrag news:dlkc4b$ppg$1 at smc.vnet.net... | Hello, | | although Mathematica solves my coupled system of three partial | differential equations (depending on one spatial variable and time) | I can unfortunately not get it to solve the steady-state version | of the above equations, i.e. only depending on one spatial variable. | I reduced it to a simple diffusion equation, but still it does not work. | My Input is like: | | dcb=0.001; | rcb=1000; | gen=5e20; | ab=2000; | d=0.001; | | sol=nc/.First[NDSolve[ | {0==dcb*nc(2)[x]+gen*Exp[-ab*x]-rcb*(nc-nc0), | nc[0]==nc0,nc(1)[d]==0},nc,{x,0,d}]] | | wherein nc(i)[x] stands for the i-th spatial derivative of nc[x]. | | I don´t understand why Mathematica does not accept this. | Could you please help? | | Regards, | Uli |