If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)

Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Weak Form Poisson Problem

Morbert · 2014-03-25 03:48:54

Hi, I know the weak form of the Poisson problem [latex]\nabla^2 \phi = -f[/latex] looks like [latex]\int \nabla \phi \cdot \nabla v = \int f v[/latex] for all suitable [latex]v[/latex]. Is there a similarly well-known form for the slightly more complicated poisson problem? [latex]\nabla (\psi \nabla \phi ) = -f[/latex] I…

25-03-2014 3:48am

#1

Morbert

Registered Users, Registered Users 2 Posts: 3,457 ✭✭✭

Join Date: September 2004

Posts: 3397

Hi,

I know the weak form of the Poisson problem

[latex]\nabla^2 \phi = -f[/latex]

looks like

[latex]\int \nabla \phi \cdot \nabla v = \int f v[/latex]

for all suitable [latex]v[/latex]. Is there a similarly well-known form for the slightly more complicated poisson problem?

[latex]\nabla (\psi \nabla \phi ) = -f[/latex]

I am writing some finite element code and variational/weak forms are very handy.

Thanks in advance

0