Elmer NF55
==========


In this tutorial a temperature calculation of first wall panel (FWP) 4
will be presented. This tutorial is a continuation of ITER nf55
benchmark case, that can be seen in :menuselection:`&Tutorials -->
ITER NF55 Case`. Temperature distribution will be calculated based on
provided surface heat flux distribution, computed with NF55 case.

.. _elmerModules:
.. figure:: images/elmerModules.png
  :align: center

  DropDown selection of Elmer modules.

First, one has to move to Elmer module. In the upper toolbar of Smiter
GUI we navigate to DropDown selection name *Modules* as shown in image
:numref:`elmerModules`.

There we see options for different modules, that are available in
Smiter. We click on *ELMER*. See figure :numref:`elmerModulesList`.
  
.. _elmerModulesList:
.. figure:: images/elmerModulesList.png
  :align: center

  List of Elmer modules.

The screenshot of Elmer consists of two main dialogs that can be found
in the upper toolbar. See figure :numref:`elmerDialogs`.
  
.. _elmerDialogs:
.. figure:: images/elmerDialogs.png
  :align: center

  Two main dialogs of Elmer module.
  
Two possible dialogs are:

* **Create new ELMER case**: With this dialog we can create new Elmer
  case for temperature calculation.

* **Show ELMER tools dialog**: With this dialog we can define
  completely new ELMER case with its own meshes, boundary conditions,
  material properties and its own physical model, that does not
  neccessarily mean heat transfer model, but also other mathematical
  models like Navier-Stokes equations, thermomechanical analysis, etc.

Here, one has to select **Create temperature case**. The following
dialog appears on the screen. See figure
:numref:`elmerBenchmarkDialog`.

.. _elmerBenchmarkDialog:
.. figure:: images/elmerBenchmarkDialog.png
   :align: center

   Elmer dialog for temperature computation.

First, we have to define the name of our case. We choose to input
*nf_55*. Then we have to navigate to the ``vtk`` file of the SMITER
nf55 case. It can be found in *smiter/studies/elmer_nf55/nf_55.vtk*
Then we define the panel type and then the panel position. After all
the values are defined, we click *Apply*. After that we can move to
the object browser. In the object browser we can see the tree
structure of the objects defined in the study. If it is not there, one
can click on icon next to *Temperature cases*. See figure
:numref:`elmerExpandTemperatures`.

.. _elmerExpandTemperatures:
.. figure:: images/elmerExpandTemperatures.png
   :align: center

   Expand tree in Object Browser.


Under Elmer we can see the tutorial case with the name *nf_55
*. If we right-click on it, a list of options appears on the
screen. If we click on *Compute case*, the computation will
start. With option *Edit case* one can edit the current case options
and with option *Delete case* one can delete the case from the
study. With option *Delete case* one can delete case from study and
with option *Rename case* one can change the name of the case. See
figure :numref:`elmerComputeCase`.

.. _elmerComputeCase:	
.. figure:: images/elmerComputeCase.png
   :align: center

   Compute case label of Elmer case. With right click on *Compute
   case* the computation starts.

User can also edit or replace current SIF file by right-click on *SIF
file* in *Object Browser*.

When the cases is ready to run right-click again on case object and
click *Compute case*. Refer to figure :numref:`elmerComputeCase`. User
can observe different stages of computation in the ELMER Output Dialog
located in the bottom left corner. See figure
:numref:`elmerOutputConsole`.

.. _elmerOutputConsole:
.. figure:: images/elmerOutputConsole.png
   :align: center

   Output console of temperature calculation. Here we can observe
   different stages of output, which finger is being calculated, have
   the meshes been prepared correctly, etc.

After the computation is finished, we can move to the ~/elmer-compute
folder (or user-defined folder for elmer cases, that can be defined),
where temperature files are stored by default. Inside there is a new
folder with the same name as the name of input ``vtk`` file. If we
open this folder the following file structure is revealed to us. For
every finger there is a folder with names *fingerleft* and
*fingerright* with ID number of finger. Inside those folders there are
mesh files and ``sif`` file of the individual finger. Last two files
are the output files of the computation File with ``vtk`` extension
contains full mesh with temperatures and heat fluxes. File
*temperatures.dat* contains coordinates of nodes on the plasma facing
surface and their temperatures in tabular form. Both result files are
copied in the main directory of the temperature computation. File
*fullVtk.vtk* is a full ``vtk`` file with all the fingers,
temperatures and heat fluxes.

::

    nf_55
    ├── fingerleft*          
    │   ├── casevtk.sif
    │   ├── elmersolver.log    
    │   ├── mesh.boundary
    │   ├── mesh.header
    │   ├── mesh.names
    │	├── mesh.nodes
    │	├── meshpartition.unv
    │	├── casevtkfile.0001.vtk
    │	└── temperatures.dat
    ├── fingerright*          
    │   ├── casevtk.sif
    │   ├── elmersolver.log
    │   ├── mesh.boundary
    │   ├── mesh.header
    │   ├── mesh.names
    │	├── mesh.nodes
    │	├── meshpartition.unv
    │	├── casevtkfile.0001.vtk
    │	└── temperatures.dat	
    ├── caseEHF.sif
    ├── fingerleft*.vtk          
    ├── fingerright*.vtk
    ├── Powcal_powx.vtk
    └── Powcal_powx_Temperatures.vtk

Result
------

After the computation has finished, one has to move to Paraview. See
figure :numref:`paraviewnavigation`.

.. _paraviewnavigation:	
.. figure:: images/paraview_module_navigation.png
   :align: center

   To go to ParaVis module, click on ParaVis icon.

Then move to ``Pipeline browser`` and right-click on ``built-in`` and
select ``open``. See figure :numref:`paraviewpipelineopen`.

.. _paraviewpipelineopen:	
.. figure:: images/paraview_pipeline_open.png
   :align: center

   Import results via pipeline browser.

The navigate to the compute folder and select file
*Powcal_powx_Temperatures.vtk*. The file will be imported into
Paraview and seen in the Pipeline Browser.

To change colormap preset, move to Color Map Editor and click on set
preset icon, as shown in figure :numref:`colormap_selection`.

.. _colormap_selection:
.. figure:: images/paraview_colormap_selection.png
   :align: center

The following window (see figure :numref:`colormap_window`) will
appear. Select **Black-Body radiation** colormap and click apply.

.. _colormap_window:
.. figure:: images/paraview_colormap_window.png
   :align: center

   Colormap presets.


The result is a full first wall panel with temperatures, as
shown in the figure :numref:`temperatures_nf_55`.

.. _temperatures_nf_55:
.. figure:: images/elmerPanel4OnlyTemperatures.png
   :align: center

   Temperature results of nf_55 case with **Black-Body radiation** colormap.