[aspect-devel] Linear solver A block tolerance & Linear solver S block tolerance ?

[Timo Heister]

> This may be unrelated to our alpha vs gravity discussion

Yes, this is unrelated provided that your normal linear solver
tolerance is chosen appropriately.

On Tue, Apr 25, 2017 at 8:31 AM, Wolfgang Bangerth <bangerth at tamu.edu> wrote:
> On 04/24/2017 05:30 PM, Shangxin Liu wrote:
>>
>> Hi Timo,
>>
>> This may be unrelated to our alpha vs gravity discussion. But there are
>> two
>> new Global parameters I have no idea about their function:
>>
>> Linear solver A block tolerance and Linear solver S block tolerance.
>>
>> What are their mathematic meanings and functions, compared to linear
>> solver
>> tolerance?
>
>
> They are discussed here (with corresponding entries in the manual):
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_geodynamics_aspect_blob_master_source_simulator_parameters.cc-23L269&d=DwIBaQ&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=c08Btfq4m9QEScXN3ZQwLZzzWQE7S8CYq1IYuzKV_Zk&m=8z3tJVPqzYcOQA2U2ajbTldOt_FUf4sTgEk7eCxjSIA&s=nM6gEmG1norfGMSsj0bwfhjuY6nP50Ep3AfKY7srnKY&e= 
>
> They correspond to the precondition that is discussed in the Kronbichler et
> al. paper.
>
> Best
>  Wolfgang
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth          email:                 bangerth at colostate.edu
>                            www: https://urldefense.proofpoint.com/v2/url?u=http-3A__www.math.colostate.edu_-7Ebangerth_&d=DwIBaQ&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=c08Btfq4m9QEScXN3ZQwLZzzWQE7S8CYq1IYuzKV_Zk&m=8z3tJVPqzYcOQA2U2ajbTldOt_FUf4sTgEk7eCxjSIA&s=0YzBnsO0bVT275l0QIJ9CKCs5tVCWlPLNhr-xiUF_e0&e= 
>
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-- 
Timo Heister
http://www.math.clemson.edu/~heister/