Author Topic: boundary condition  (Read 3302 times)

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Offline abhi005

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boundary condition
« on: November 17, 2014, 15:55 »
i am making an cntfet.i dont know which boundary condition are best for my device.i have choosen neuman but the multigrid residual error is infinite. so i choose drichlet for B bottom and neumann for all others then error is less but quite large(e+000).so i choose drichlet for B bottom A front A back and neumann for B top.now error is quite small(e-010).so my question is

1.Does drichlet condition can be consider for device with gate?

« Last Edit: November 24, 2014, 13:19 by abhi005 »

Offline Umberto Martinez

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Re: boundary condition
« Reply #1 on: November 25, 2014, 10:30 »
The correct boundary condition is to use Neumann boundary conditions along the direction where the gate is defined.
However, Neumann boundary conditions are more difficult to converge, thus, a good strategy is to converge with Dirichlet boundary conditions and then use the converged state to start up the Neumann boundary condition calculation.

Offline abhi005

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Re: boundary condition
« Reply #2 on: December 23, 2014, 14:29 »
thanks for your reply.i am not getting how it can be done. Can you please tell me how can I converged my geometry with one boundary condition and then how can I use this converge state for further calculations.

Offline Anders Blom

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