ns). I checked KSP solver for SNES and
>> it converges with a few iterations.
>> >
>> > I would appreciate any suggestions or observations to increase the
>> convergence speed?
>> >
>> > Best,
>> > Ata
>>
>>
>
> --
> Department of Mathematics and Center for Computation & Technology
> Louisiana State University, Baton Rouge, LA 70803, USA
> Tel. +1 (225) 578 1612, Fax +1 (225) 578 4276
> http://www.math.lsu.edu/~bourdin
>
>
>
>
>
>
>
>
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ter for Computation & Technology
Louisiana State University, Baton Rouge, LA 70803, USA
Tel. +1 (225) 578 1612, Fax +1 (225) 578 4276 http://www.math.lsu.edu/~bourdin
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). I checked KSP solver for SNES and
> it converges with a few iterations.
> >
> > I would appreciate any suggestions or observations to increase the
> convergence speed?
> >
> > Best,
> > Ata
>
>
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What do you get with -snes_vi_monitor it could be it is taking a while to
get the right active set.
Barry
On Jan 16, 2012, at 6:20 PM, Ataollah Mesgarnejad wrote:
> Dear all,
>
> I'm trying to use SNESVI to solve a quadratic problem with box constraints.
> My problem in FE context re
ow convergence
> (~50-70 iterations). I checked KSP solver for SNES and it converges with a
> few iterations.
>
> I would appreciate any suggestions or observations to increase the
> convergence speed?
>
> Best,
> Ata
>
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iate any suggestions or observations to increase the
> convergence speed?
>
> Best,
> Ata
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Dear all,
I'm trying to use SNESVI to solve a quadratic problem with box constraints. My
problem in FE context reads:
(\int_{Omega} E phi_i phi_j + \alpha \epsilon dphi_i dphi_j dx) V_i -
(\int_{Omega} \alpha \frac{phi_j}{\epsilon} dx) = 0 , 0<= V <= 1
or:
[A]{V}-{b}={0}
here phi is the basi
Is it possible to use DMDAs in the context of a cell-centered
finite volume method? For example, a 2D grid with 9-by-9 grid
points would have 8-by-8 unknowns, located in the cell
centers. After reading the documentation, I got the impression
that the unknowns must be situated at the grid points, o
You might want to use Q0 interpolation
in this case.
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