[Getdp] Problems with time loop

[Christophe Geuzaine]

On 20/10/10 15:41, Raphael Lamon wrote:
> Dear Mr. Dular and Mr. Geuzaine,
>
> I've been trying for a long time to get a solution to the time-dependent
> wave equation with dissipation. I've managed to solve the static case
> but the solution to the dynamic case keeps changing between the initial
> state and zero everywhere. Therefore I think that it is more of a
> problem caused by TimeLoopTheta. I kindly ask for your help because I've
> gone through the manual, the tutorial and every examples without
> figuring out why it keeps blinking.
>

Hi Raphael - If you write your time-dependent wave equation using a 
second order time derivative you cannot use TimeLoopTheta. You can use 
TimeLoopNewmark instead. (For TimeLoopTheta you should write the system 
as coupled first-order equations instead).

There's a complete example with dissipation here:
https://geuz.org/trac/getdp/wiki/MicroWaveElectricField (login: getdp, 
passwd: getdp)


> Thank you so much.
>
> Kindest regards,
>
> Raphael Lamon
>
>
>
> _______________________________________________
> getdp mailing list
> getdp at geuz.org
> http://www.geuz.org/mailman/listinfo/getdp


-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine