[GiDlist] Re: Dynamic mesh postprocessing

[Andres Galavis]

Just in case the other didn't arrived

On 9/13/05, Andres Galavis andres.galavis at gmail.com wrote:

Good Day,
I'm trying to use GiD to visualize the output of a problem with a moving
mesh. According to the things i've read there is no posibility of updating
the mesh, but what i've read is quite old (2003) so i would like yo know if
this issue has by now any workaround.
Sorry for the bad english and thaks for the help.
A.G.

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[Malte Neumann]

On Tue, Sep 13, 2005 at 06:28:12PM +0200, Andres Galavis wrote:
Just in case the other didn't arrived

On 9/13/05, Andres Galavis andres.galavis at gmail.com wrote:

Good Day,
I'm trying to use GiD to visualize the output of a problem with a
moving mesh. According to the things i've read there is no posibility
of updating the mesh, but what i've read is quite old (2003) so i would
like yo know if this issue has by now any workaround.
Sorry for the bad english and thaks for the help.
A.G.

Hi Andres,

if your mesh is "only moving", e.g. in an ALE formulation, you can specify
the mesh movement as deformation and display your results on the deformed
domain.

But I think it is still not possible to display results if the topology of
your mesh is changing, e.g. by remeshing.

Regards

Malte


--
Malte Neumann
Institute of Structural Mechanics, University of Stuttgart, Germany
http://www.uni-stuttgart.de/ibs/members/neumann/

[Andres Galavis]

Hi Malte,
Thanks yor out answer. Sadly in my mesh i have to create new nodes, so even
if there is a workaround my problem, the solution would take longer to
create than just using our traditional postprocesor. Anyway if its good for
anyone, what i have thought is to instruct the solver to write all the nodes
in each step with new numbers, and append them to the mesh file, and since
the notes that are not included in the solution are not shown we'll have the
ilusion of having a moving mesh. That way we will have a HUGE mesh file,
which i don't know if its practical or not.
I guess i'll use another tool...
Greetings
A.G.
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[Andres Galavis]

Errata :

Hi Malte,
Thanks your answer. Sadly in my mesh i have to create new nodes, so even
if there is a workaround my problem, the solution would take longer to
create than just using our traditional postprocesor. Anyway if its good for
anyone, what i have thought is to instruct the solver to write all the nodes
in each step with new numbers, and append them to the mesh file, and since
the nodes that are not included in the solution are not shown we'll have the
ilusion of having a moving mesh. That way we will have a HUGE mesh file,
which i don't know if it's practical or not.
I guess i'll use another tool...
Greetings
A.G.


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[miguel]

Hi,

if the mesh changes during the analysis, like in adaptive mesh or remeshing
(i.e. the topology of the mesh changes) it's still possible to postprocess
it in GiD.

To do this, look at menu entry Files-Open Multiple ( help also at
'http://www.gidhome.com/support/gidbeta/gid_14.subst#SEC193').



Just write pairs of mesh&results files (as of if each pair were to be read
alone in GiD) and read them together in GiD with that option.



In other words: for instance lets say that you have refined the same
geometry/mesh 3 times, each mesh with their own results: like this:



Mesh 1: 5 analysis steps with results.



Mesh 2: 3 analysis steps with results.



Mesh 3: 2 analysis steps with results.



Then just write:



Mesh 1: file_mesh_1.msh, file_msh_1.res (with the results for the 5 steps),
or their equivalent in binary file_mesh_1.bin.

Mesh 2: file_mesh_2.msh, file_msh_2.res (with the results for the 3 steps),
or their equivalent in binary file_mesh_1.bin.

Mesh 3: file_mesh_3.msh, file_msh_3.res (with the results for the 2 steps),
or their equivalent in binary file_mesh_1.bin.



You can manage each pair (.msh and .res) separate one from the other in GiD
with File-Open



Or view them together with File-Open multiple.



Remember two things:



It's preferable that mesh names should be the same ( so if in
file_mesh_1.msh there are the meshes "hull" and "ship", in file_mesh_2.msh
and file_mesh_3.msh both meshes should also be present). If not, when you
change the current step selection then on the layers windows some meshes
will appear and disappear (as they are present in the selected step or not).



It's preferable to have different step values for each mesh. If you write
mesh_1 and res_1 with the same analysis name and step value as mesh_2 and
res_2, only the latest results will be defined inside GiD, as the second
results overwrite the first one.



Enclosed you'll find an example of 9 meshes with their results. Open them
with File-Open Multiple by cliking on the first one and Shift-clicking the
last one.



miguel



_____

De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de Andres Galavis
Enviado el: martes, 13 de septiembre de 2005 18:28
Para: gidlist at gatxan.cimne.upc.es
Asunto: [GiDlist] Re: Dynamic mesh postprocessing



Just in case the other didn't arrived

On 9/13/05, Andres Galavis andres.galavis at gmail.com wrote:

Good Day,

I'm trying to use GiD to visualize the output of a problem with a moving
mesh. According to the things i've read there is no posibility of updating
the mesh, but what i've read is quite old (2003) so i would like yo know if
this issue has by now any workaround.

Sorry for the bad english and thaks for the help.

A.G.



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[miguel]

Since version 7.5.3b it is possible to read several meshes inside GiD with
the option Files-Open Multiple
(http://www.gidhome.com/support/gidbeta/gid_14.subst#SEC193)

Which reads several .post.bin ( or pairs of .msh .res) at once.

miguel

-----Mensaje original-----
De: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu] En nombre de Malte Neumann
Enviado el: miércoles, 14 de septiembre de 2005 7:51
Para: gidlist at gatxan.cimne.upc.edu
Asunto: Re: [GiDlist] Re: Dynamic mesh postprocessing

On Tue, Sep 13, 2005 at 06:28:12PM +0200, Andres Galavis wrote:
Just in case the other didn't arrived

On 9/13/05, Andres Galavis andres.galavis at gmail.com wrote:

Good Day,
I'm trying to use GiD to visualize the output of a problem with a
moving mesh. According to the things i've read there is no posibility
of updating the mesh, but what i've read is quite old (2003) so i would
like yo know if this issue has by now any workaround.
Sorry for the bad english and thaks for the help.
A.G.

Hi Andres,

if your mesh is "only moving", e.g. in an ALE formulation, you can specify
the mesh movement as deformation and display your results on the deformed
domain.

But I think it is still not possible to display results if the topology of
your mesh is changing, e.g. by remeshing.

Regards

Malte


--
Malte Neumann
Institute of Structural Mechanics, University of Stuttgart, Germany
http://www.uni-stuttgart.de/ibs/members/neumann/
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