[petsc-dev] ResQPASS in Petsc

[Matthew Knepley]

On Wed, Sep 10, 2025 at 11:42 AM Wim Vanroose <wim at vanroo.se> wrote:

> Dear,
>
> We are developing novel subspace methods to deal with inequality bounds on
> the variables.
> ResQPASS, short for Residual Quadratic programming active set Subspace
> method,  behaves asymptotically as a Krylov subspace.  The paper is
> published in SISC and is available in https://urldefense.us/v3/__https://arxiv.org/abs/2302.13616__;!!G_uCfscf7eWS!YmnwRAx_eHfCG2V2WlrTySK1w_eSwS7AWzqhbyF8TX1KlhOBuYKbPTTnNY1Z7sYdVgQj9V1rS6hZig316hL9$ 
> <https://urldefense.us/v3/__https://arxiv.org/abs/2302.13616__;!!G_uCfscf7eWS!bnM-6GCLUYnx_bcmKoE5yD6ehhfMLkUeEB7g_LRq0OMhvkWuwolEBu_gw8jdqo-VxP43j8InK6Eb6X6U9g$>
> .
>
> In the past we contributed several pipelined methods in KSP.    But the
> current methods might also be of value for large scale optimization
> problems.  We believe that the method will be very useful for contact
> problems and variational inequalities that model interacting mechanical
> systems.
>
> Who should I contact to discuss the best strategy to add the solver?
>

That sounds great! I am currently working on variational inequalities for
frictional contact (for earthquake systems). I would be happy to help you
integrate these solvers. We are excited to test different formulations (the
LVPP people are also talking to us). Let me know how I can help.

  Thanks,

     Matt


> Wim Vanroose
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

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