[Getdp] absorbing boundary condition

[Christophe Geuzaine]

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

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