Re: [deal.II] Equation implementation

[Toddy Liu]

Hi, Daniel

Thank you very much for your valuable advice and I will try with that.

在2021年8月26日星期四 UTC+8 上午5:17:20 写道：

> Toddy,
>
> I would start with thinking about the time discretization scheme you want 
> to use and in particular which terms you want to treat explicitly and which 
> implicitly.
> After you have done that, you might still end up with a nonlinear problem 
> in which case you should have a look at 
> https://www.dealii.org/current/doxygen/deal.II/step_15.html and 
> https://www.dealii.org/current/doxygen/deal.II/step_25.html.
>
> Best,
> Daniel
>
> Am Mi., 25. Aug. 2021 um 09:11 Uhr schrieb Toddy Liu  >:
>
>> Dear Deal.II community,
>>
>> I'm getting trouble in constructing system matrix of a complex PDE. My 
>> PDE is a time-dependent equation, and in simplicity it seems like 
>>
>> [image: screenshot.png]
>> U is the variable, t denotes the time. D, alpha, beta are constant. So 
>> could you please give me some advice about doing this or any reference in 
>> existing dealii examples.
>>
>> Thank you very much.
>>
>> -- 
>> The deal.II project is located at http://www.dealii.org/
>> For mailing list/forum options, see 
>> https://groups.google.com/d/forum/dealii?hl=en
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>>  
>> 
>> .
>>
>

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Re: [deal.II] Equation implementation

[Daniel Arndt]

Toddy,

I would start with thinking about the time discretization scheme you want
to use and in particular which terms you want to treat explicitly and which
implicitly.
After you have done that, you might still end up with a nonlinear problem
in which case you should have a look at
https://www.dealii.org/current/doxygen/deal.II/step_15.html and
https://www.dealii.org/current/doxygen/deal.II/step_25.html.

Best,
Daniel

Am Mi., 25. Aug. 2021 um 09:11 Uhr schrieb Toddy Liu :

> Dear Deal.II community,
>
> I'm getting trouble in constructing system matrix of a complex PDE. My PDE
> is a time-dependent equation, and in simplicity it seems like
>
> [image: screenshot.png]
> U is the variable, t denotes the time. D, alpha, beta are constant. So
> could you please give me some advice about doing this or any reference in
> existing dealii examples.
>
> Thank you very much.
>
> --
> The deal.II project is located at http://www.dealii.org/
> For mailing list/forum options, see
> https://groups.google.com/d/forum/dealii?hl=en
> ---
> You received this message because you are subscribed to the Google Groups
> "deal.II User Group" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to dealii+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/dealii/b239ae4a-a114-47a7-ad59-a275f8771239n%40googlegroups.com
> 
> .
>

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[deal.II] Equation implementation

[Toddy Liu]

Dear Deal.II community,

I'm getting trouble in constructing system matrix of a complex PDE. My PDE 
is a time-dependent equation, and in simplicity it seems like 

[image: screenshot.png]
U is the variable, t denotes the time. D, alpha, beta are constant. So 
could you please give me some advice about doing this or any reference in 
existing dealii examples.

Thank you very much.

-- 
The deal.II project is located at http://www.dealii.org/
For mailing list/forum options, see 
https://groups.google.com/d/forum/dealii?hl=en
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