Unverified Commit c2c2395d authored by Roberto Porcu's avatar Roberto Porcu Committed by GitHub
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Merge pull request #31 from rporcu/master 

add deposition schemes to the interphase coupling section
parents 87b9c28c a039c1f5

docs/picvva/source/conf.py

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@@ -66,7 +66,7 @@ author = u'MFIX-Exa Team' 
#

# This is also used if you do content translation via gettext catalogs.

# Usually you set "language" from the command line for these cases.

language = None

language = 'en'



# List of patterns, relative to source directory, that match files and

# directories to ignore when looking for source files.

docs/source_docs/conf.py

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@@ -67,7 +67,7 @@ author = u'MFIX-Exa Team' 
#

# This is also used if you do content translation via gettext catalogs.

# Usually you set "language" from the command line for these cases.

language = None

language = 'en'



# List of patterns, relative to source directory, that match files and

# directories to ignore when looking for source files.

docs/source_docs/inputs/InputsCoupling.rst

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Interphase Coupling

===================



Deposition scheme

-----------------



The following inputs must be preceded by "mfix."



+----------------------------+---------------------------------------------------+--------+-------------+

|                            | Description                                       |   Type | Default     |

+============================+===================================================+========+=============+

| deposition_scheme          | The algorithm that will be used to deposit        | String | 'trilinear' |

|                            | particles quantities to the Eulerian grid         |        |             |

|                            | Available methods are:                            |        |             |

|                            |                                                   |        |             |

|                            | * 'centroid'                                      |        |             |

|                            | * 'trilinear'                                     |        |             |

|                            | * 'true-dpvm' divided particle volume method      |        |             |

|                            | * 'trilinear-dpvm-square' dpvm with square filter |        |             |

+----------------------------+---------------------------------------------------+--------+-------------+

| deposition_scale_factor    | The deposition scale factor. Only applies to      | Real   | 1.0         |

|                            | 'true-dpvm' and 'trilinear-dpvm-square' methods.  |        |             |

|                            | Its value must be in the interval [0, dx/2],      |        |             |

|                            | where dx is the cell edge size.                   |        |             |

+----------------------------+---------------------------------------------------+--------+-------------+

| deposition_diffusion_coeff | If a positive value is set, a diffusion equation  | Real   | -1.0        |

|                            | with this diffusion coefficient is solved to      |        |             |

|                            | smooth deposited quantities.                      |        |             |

+----------------------------+---------------------------------------------------+--------+-------------+



In the following subsections, the four possible deposition methods are briefly

described and illustrated.





Centroid

~~~~~~~~

In the centroid deposition scheme, particles' quantities are deposited only to

the Eulerian grid cell to which the particle's center belongs.



.. raw:: latex



   \begin{center}



   .. _fig:basics:amrgrids:



.. figure:: ./figures/centroid.jpg

   :height: 2in



   Example of centroid deposition.



.. raw:: latex



   \end{center}





Trilinear

~~~~~~~~~

In the trilinear deposition scheme, particles' quantities are deposited linearly

to the eight Eulerian grid cells that surround its center.



.. raw:: latex



   \begin{center}



   .. _fig:basics:amrgrids:



.. figure:: ./figures/trilinear.jpg

   :height: 2in



   Example of trilinear deposition.



.. raw:: latex



   \end{center}





Divided Particle Volume Method (DPVM)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In the DPVM method, particles' quantities are deposited to the Eulerian grid

cells that they intersect, and the deposition weights are equal to the

percentage of the particle' volume that intersects the given cell.



.. raw:: latex



   \begin{center}



   .. _fig:basics:amrgrids:



.. figure:: ./figures/dpvm.jpg

   :height: 2in



   Example of dpvm deposition.



.. raw:: latex



   \end{center}





Square DPVM

~~~~~~~~~~~

In the square DPVM method, particles' quantities are deposited to the Eulerian

grid similarly to the DPVM method, but with a filter applied to the deposition

scheme.



.. raw:: latex



   \begin{center}



   .. _fig:basics:amrgrids:



.. figure:: ./figures/square_dpvm.jpg

   :height: 2in



   Example of square dpvm deposition.



.. raw:: latex



   \end{center}





Drag

----
@@ -12,7 +129,7 @@ The following inputs must be preceded by "mfix." 
| drag_type         | Which drag model to use                                               | String      | None      |

+-------------------+-----------------------------------------------------------------------+-------------+-----------+



The options currently supported in mfix are :cpp:`WenYu`, :cpp:`Gidaspow`, :cpp:`BVK2`, or :cpp:`UserDrag`.

The options currently supported in mfix are :c++:`WenYu`, :c++:`Gidaspow`, :c++:`BVK2`, or :c++:`UserDrag`.



If one of these is not specified, the code will abort with
@@ -26,7 +143,7 @@ The drag models are defined in src/src_des/des_drag_K.H 


If the user wishes to use their own drag model, they must



  * specify :cpp:`mfix.drag_type = UserDrag` in the inputs file

  * specify :c++:`mfix.drag_type = UserDrag` in the inputs file



  * provide the code in the ComputeDragUser routine in a local usr_drag.cpp file.

    An example can be found in tests/DEM06-x.
@@ -145,7 +262,7 @@ The following inputs must be preceded by "mfix." 
| convection_type   | Which HTC model to use          | String      | RanzMarshall |

+-------------------+---------------------------------+-------------+--------------+



The options currently supported in mfix are :cpp:`RanzMarshall` (default) and :cpp:`Gunn`. 

The options currently supported in mfix are :c++:`RanzMarshall` (default) and :c++:`Gunn`. 

In both models the HTC is determined from a Nusslet number corelation. 



The RanzMarshall Nusselt number correlation is defined as:

docs/source_docs/inputs/figures/centroid.jpg

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docs/source_docs/inputs/figures/dpvm.jpg

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