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<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Cambria","serif"'>Dear
DUNE-developers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Cambria","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'>this
e-mail is about coupling of DUNE to *explicit* cell centered finite volume
scheme and vice versa. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'>Our
problem by development of a multi-purpose solver was related to the slow access
(even with iterators) to the elements of numerical vector implemented by using
of various C++ data structures (s. Table 2 of the file attached: it is not the
final version of the text; I send it for our discussion only). <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'>We
installed DUNE (EMI, Freiburg) yesterday and –according to my tests –
Dune::FieldVector is the only C++ data structure providing the faster access
than FORTRAN. I guess / hope that by coupling to DUNE data structures we would
be able to develop the *<b>fast</b>* solver. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span lang=EN-US style='font-size:12.0pt;
font-family:"Cambria","serif"'>At the moment I do not need the grid itself. I
have an unstructured grid saved in external file. I need the DUNE grid data
structure (with its fast access to the grid entities) , which I can fill
with my mesh and specify with my properties (s. Table 1 of the file attached) .
How to do it? My current implementation for the grid readout is shown in
the file read_grid.pdf attached. How to do the same and fill the grid of –
probably - ALUGrid type? Imagine, we have only a 3D macrogrid (no refinement)
consisting of hexahedrons. <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
lang=EN-US style='font-family:"Cambria","serif"'><span style='mso-list:Ignore'>2)<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'>In your
example p.43 </span><span lang=EN-US style='font-family:"Cambria","serif"'><a
href="http://www.dune-project.org/doc/grid-howto/">http://www.dune-project.org/doc/grid-howto/</a>
you set only one property to each grid entity: concentration for cells ,
velocity for face, etc. but if it is a long list of – complex (cell.content:
multifluid or embedded in the cell object) – properties ?<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span
lang=EN-US style='font-family:"Cambria","serif"'><span style='mso-list:Ignore'>3)<span
style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span
lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'>I would like
to compare</span><span lang=EN-US style='font-family:"Cambria","serif"'> the </span><span
lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'> </span><span
lang=EN-US style='font-family:"Cambria","serif"'>efficiency of the </span><span
lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'>DUNE grid </span><span
lang=EN-US style='font-family:"Cambria","serif"'>container </span><span
lang=EN-US style='font-size:12.0pt;font-family:"Cambria","serif"'>with boost::intrusive::unordered_set
(s. Table 3)</span><span lang=EN-US style='font-family:"Cambria","serif"'>. Please
recommend the simplest DUNE grid type, which I can fill with only one kind of entities:
cells , i.e. Cuboids with defined index, unit lengths and volume and
perform analysis as in Table 3. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-family:"Cambria","serif"'><o:p> </o:p></span></p>
<p class=Default><span lang=EN-US style='font-family:"Cambria","serif"'>To
avoid disappointments: this e-mail is not an application for a joint project,
but it is an attempt to find a common language for a possible collaboration (if
the DUNE tests will be positive).<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thank you very much in advance for your
support and with best regards,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Nadeschda Kirchner<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Dr. rer. nat. Nadejda Kirchner<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Abteilung Numerische Simulation<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Fraunhofer Ernst-Mach-Institut<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Nadejda.Kirchner@e</span>mi.fraunhofer.de<o:p></o:p></p>
<p class=MsoNormal><a href="http://www.emi.fhg.de"><span style='color:blue'>www.emi.fhg.de</span></a><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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