[Getdp] absorbing boundary condition

[Christophe Geuzaine]

Lin Ji wrote:
> 
> It means the partial derivatives of 'u' to those variables.
> 

Ok. It's not trivial: I'll think about it.

> Lin
> 
> On Jul 26,  8:07pm, Christophe Geuzaine wrote:
> > Subject: Re: [Getdp] absorbing boundary condition
> > Lin Ji wrote:
> > >
> > > Hi, Christophe,
> > >     Thank you for your response. For the following rectangular region,
> > >         0<x<0.5, -0.5<y<0.5
> > > if we have a source at x = 0, then the 3rd order absorbing boundary
> condition
> > > on the other three sides read
> > >
> > > 1. x = 0.5 : -u_{xtt} - u_{ttt} + (1/4)u_{xyy} + (3/4)u_{tyy} = 0
> > >
> > > 2. y = -0.5 : u_{ytt} - u_{ttt} + (1/4)u_{yxx} + (3/4)u_{txx} = 0
> > >
> > > 3. y = 0.5 : -u_{ytt} - u_{ttt} - (1/4)u_{yxx} + (3/4)u_{txx} = 0
> > >
> >
> > What's the meaning of the subscripts?
> >
> > --
> > Christophe Geuzaine
> >
> > Tel: 32 (0) 4 366 37 10    http://geuz.org
> > Fax: 32 (0) 4 366 29 10    mailto:Christophe.Geuzaine at ulg.ac.be
> >-- End of excerpt from Christophe Geuzaine
> 
> --
> Dept. of Math., RPI
> 518-276,2184(work)
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-- 
Christophe Geuzaine

Tel: 32 (0) 4 366 37 10    http://geuz.org
Fax: 32 (0) 4 366 29 10    mailto:Christophe.Geuzaine at ulg.ac.be