[Dune] unwanted refinement with ALUGRID_CUBE

[Bernd Flemisch]

Hi,

you can switch the magic switch in the DGF file by setting the 
corresponding grid parameter:
GridParameter
% set closure to none for UGGrid
closure none
#

This allows for an arbitrary number of hanging nodes in UGGrid.

Kind regards
Bernd

On 12/07/2012 03:21 PM, Christian Engwer wrote:
> For UG there is some magic switch I've been using ages ago, which
> disables the closure and thus allows for hanging nodes, including
> arbitrary hanging nodes.
>
> An other option is to use the subgrid and mark different cells on
> different levels and construct you hanging nodes mesh that way. In
> this case you could use subgrid<yaspgrid>
>
> Christian
>
> On Fri, Dec 07, 2012 at 02:07:18PM +0000, Dedner, Andreas wrote:
>> Hi.
>>
>> I believe there is only a constructor like that for the 2d setting and there its on the base class which should
>> probably not be used directly - in fact non conformity with more than one hanging node per codim 1 entity
>> is supported by the 2d alugrid library but not by the bindings at the moment.
>> In 3d there is no such switch - I would have to look into the code because I'm not quite sure what
>> the restrictions are. It's definitely one level over codim 1 entities but I'm not quite sure what it is
>> over codim 2 entities (Matteo's test seem to indicate that its only level one as well).
>>
>> Andreas
>> ________________________________________
>> From: dune-bounces+a.s.dedner=warwick.ac.uk at dune-project.org [dune-bounces+a.s.dedner=warwick.ac.uk at dune-project.org] on behalf of Carsten Gräser [graeser at math.fu-berlin.de]
>> Sent: 07 December 2012 11:55
>> To: dune at dune-project.org
>> Subject: Re: [Dune] unwanted refinement with ALUGRID_CUBE
>>
>> Hi Matteo,
>> this is because the level of hanging nodes is restricted and the
>> default is one.
>>
>> There's a constructor where you can specify the number of hanging
>> nodes. However, I'm not sure if this is the number per edge, per face,
>> or number of nested hanging nodes, i.e. the level.
>>
>> Best,
>> Carsten
>>
>>
>>
>> re is a default of
>> Am 07.12.2012 11:16, schrieb Matteo Semplice:
>>> Dear Dune,
>>>      I am trying to create on purpose an irregular quad-based grid for a
>>> test.
>>> My purpose is to have some elements whose neighbours along an edge have
>>> two different sizes (e.g. one of size 1/2 and two of size 1/4) like this
>>>
>>> |-------|  edge of big quad
>>> |-|-|---|  edges of neighbouring quads
>>>
>>> Is there something in ALUgrid or DUNE that prevents this?
>>>
>>> Here's my experiment.
>>>
>>> I start with a grid of a single square (level 0)
>>> I refine it once obtaining 4 level 1 quads.
>>> I mark the north-east and south-west quads and call adapt and I have a
>>> grid with 2 level 1 quads and 8 level 2 quads.
>>> I do this once more: mark the north-east and south-west level 2 quads
>>> and call adapt.
>>> This time the level2 quads that were marked get refined, but also the
>>> level 1 quads (not marked!) are refined.
>>>
>>> I am wondering if ALUGRID or DUNE have some mechanism that automatically
>>> causes the refinement of the unmarked level1 quads. If so, I appreciate
>>> that this feature is quite understandable (and desirable!) for
>>> production code, but is there a way to turn this feature off for a test?
>>>
>>> Best regards,
>>>      Matteo
>>
>> --
>> ----------------------------------------------------------------------
>> Dr. Carsten Gräser       | phone: +49-30 / 838-75349
>> Freie Universität Berlin | fax  : +49-30 / 838-54977
>> Institut für Mathematik  | email: graeser at math.fu-berlin.de
>> Arnimallee 6             |
>> 14195 Berlin, Germany    | URL  : http://page.mi.fu-berlin.de/graeser
>> ----------------------------------------------------------------------
>>
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>>
>>
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-- 
_____________________________________________________________________

Bernd Flemisch                               phone: +49 711 685 69162
IWS, Universität Stuttgart                   fax:   +49 711 685 60430
Pfaffenwaldring 61                  email: bernd at iws.uni-stuttgart.de
D-70569 Stuttgart                  url: www.hydrosys.uni-stuttgart.de
_____________________________________________________________________