Hi Lorenzo,
yes, if you use a mesh file than you should not provide UpperRight, etc.
in the input file. Then, you simply specify the "File" parameter (as you
did).
You can use both cube or simplices with ALUGrid, both in 3d and 2d. But,
as I mentioned in the previous mail, you have to specify this at compile
time (i.e. dimension, world dimension, element type). The grid contained
in your .msh file must fulfill this in the sense that it must only
contain elements of the type that you specified at compile time. So if
your msh file is based on 3d cubes this would work.
Cheers,
Dennis
On 24.10.2018 12:02, lc wrote:
Hello Dennis,
yes thanks, this is ok, but if I use a gmsh file:
File = ./rect_unstruct.msh
Verbosity = 1
BoundarySegments = 1
DomainMarkers = 1
than the following lines should commented?
#UpperRight = 150 150
#Cells = 15 15
#CellType = Simplex
But in this case, can I do cube (3D) geometries?
Kind regards,
Lorenzo
On 24/10/2018 12:54, Dennis Gläser wrote:
Hi Lorenzo,
for 2d Grids you have to adapt your input file providing only two
coordinates, i.e.:
[Grid]
LowerLeft = 0 0
UpperRight = 1 1
Cells = 10 10
CellType = Simplex
and where you specify the grid property (this is most probably your
problem file), you have to set:
SET_TYPE_PROP(MYTYPETAG, Grid, Dune::ALUGrid<2, 2, Dune::simplex,
Dune::conforming>);
MYTYPETAG is to be substituted by the actual name of your type tag
and the last argument specifies if you want conforming or
nonconforming refinement. You see that you have to tell ALUGrid at
compile time already which type of elements you want to use and in
your case there was probably Dune::cube specified.
I hope this helps!
Dennis
On 24.10.2018 11:49, lc wrote:
Thank you Timo,
but as I understand, also from the return message:
Dune reported error: GridError
[assertGeometryType:/usr/local/include/dune/alugrid/3d/gridfactory.hh:438]:
Only cube geometries can be inserted into ALUGrid< 3, 3, cube,
refrule >.
only 3D geometries can be handled by Alugrid, is it correct?
Maybe UGGrid can manage also 2d unstructured geometries? In this
case it is advisable to use it?
Indeed, which is the main difference between these packages?
Best regards,
Lorenzo
On 24/10/2018 11:28, Timo Koch wrote:
Hi Lorenzo,
You download
(https://gitlab.dune-project.org/extensions/dune-alugrid),
configure, and compile dune-alugrid, like any other Dune module.
You can set Dune::ALUGrid as grid manager, by setting the "Grid"
property in Dumux to this type.
(1) For a simple rectangular mesh with simplices, just use the
structured grid factory through the DuMux input file by putting
something like this in your input file:
[Grid]
LowerLeft = 0 0 0
UpperRight = 1 1 1
Cells = 10 10 10
CellType = Simplex
(2) For more complicated simplex grids you typically generate the
mesh with gmsh (http://gmsh.info/) which will produce an *msh file.
You can tell ALUGrid to use this file through the input file
[Grid]
File = mygrid.msh
For more informations on grid managers and how to use them, please
have a look at the Dumux handbook
(http://www.dumux.org/documents/dumux-handbook-2.12.pdf).
Best wishes
Timo
On 24.10.18 09:55, lc wrote:
Good morning developers and users,
I'd like to ask how to use alugrid. Where can I find some
examples/references just to create simplices mesh even for simple
rectangular geometries.
Thank you,
Lorenzo
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