diff --git a/docs/picvva/Makefile b/docs/picvva/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..e7af19555098c16253f44b1a5c4e2d1dd8b62ad4
--- /dev/null
+++ b/docs/picvva/Makefile
@@ -0,0 +1,24 @@
+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS ?=
+SPHINXBUILD ?= sphinx-build
+SOURCEDIR = source
+BUILDDIR = build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+ @$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option. $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+ @$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+# move the generated html into webroot with the rest of the html
+all: html
+ mv build/html ../webroot/picvva_html
diff --git a/docs/picvva/source/_static/theme_overrides.css b/docs/picvva/source/_static/theme_overrides.css
new file mode 100644
index 0000000000000000000000000000000000000000..7c1a5202231086af91e2bd4b388d8de4b064f27f
--- /dev/null
+++ b/docs/picvva/source/_static/theme_overrides.css
@@ -0,0 +1,10 @@
+/* override table width restrictions */
+.wy-table-responsive table td, .wy-table-responsive table th {
+ white-space: normal;
+}
+
+.wy-table-responsive {
+ margin-bottom: 24px;
+ max-width: 100%;
+ overflow: visible;
+}
diff --git a/docs/picvva/source/conf.py b/docs/picvva/source/conf.py
new file mode 100644
index 0000000000000000000000000000000000000000..5d2da9b1bfe90398e262ce8d55251d7b88a62b1e
--- /dev/null
+++ b/docs/picvva/source/conf.py
@@ -0,0 +1,175 @@
+# -*- coding: utf-8 -*-
+#
+# amrex documentation build configuration file, created by
+# sphinx-quickstart on Thu Oct 19 14:30:08 2017.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#
+# import os
+# import sys
+# sys.path.insert(0, os.path.abspath('.'))
+
+import sphinx_rtd_theme
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = ['sphinx.ext.mathjax',
+ 'sphinx.ext.githubpages',
+ 'sphinx.ext.viewcode']
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['ytemplates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = u'MFiX-Exa'
+copyright = u'2017-2018, MFiX-Exa Team'
+author = u'MFiX-Exa Team'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+#version =
+# The full version, including alpha/beta/rc tags.
+#release =
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# 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
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This patterns also effect to html_static_path and html_extra_path
+exclude_patterns = []
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+# This is necessary to reference numbered figures
+numfig = True
+
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages. See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'sphinx_rtd_theme'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further. For a list of options available for each theme, see the
+# documentation.
+#
+# html_theme_options = {}
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+html_css_files = ['theme_overrides.css']
+
+# Custom sidebar templates, must be a dictionary that maps document names
+# to template names.
+#
+# This is required for the alabaster theme
+# refs: http://alabaster.readthedocs.io/en/latest/installation.html#sidebars
+html_sidebars = {
+ '**': [
+ 'about.html',
+ 'navigation.html',
+ 'relations.html', # needs 'show_related': True theme option to display
+ 'searchbox.html',
+ 'donate.html',
+ ]
+}
+
+
+# -- Options for HTMLHelp output ------------------------------------------
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'amrexdoc'
+
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+ # The paper size ('letterpaper' or 'a4paper').
+ #
+ # 'papersize': 'letterpaper',
+
+ # The font size ('10pt', '11pt' or '12pt').
+ #
+ # 'pointsize': '10pt',
+
+ # Additional stuff for the LaTeX preamble.
+ #
+ # 'preamble': '',
+
+ # Latex figure (float) alignment
+ #
+ # 'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+# author, documentclass [howto, manual, or own class]).
+latex_documents = [
+ (master_doc, 'mfix.tex', u'MFiX-Exa Documentation',
+ u'MFiX-Exa Team', 'manual'),
+]
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+ (master_doc, 'mfix', u'MFiX-Exa Documentation',
+ [author], 1)
+]
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+# dir menu entry, description, category)
+texinfo_documents = [
+ (master_doc, 'mfix', u'MFiX-Exa Documentation',
+ author, 'MFiX-Exa Term', "MFiX-Exa, it's MFiX... but now with more Exa!",
+ 'Miscellaneous Aardvark'),
+]
diff --git a/docs/picvva/source/index.rst b/docs/picvva/source/index.rst
new file mode 100644
index 0000000000000000000000000000000000000000..a527727727dec59baab26039dae7e5ec1474140b
--- /dev/null
+++ b/docs/picvva/source/index.rst
@@ -0,0 +1,39 @@
+.. MFIX-Exa PIC VVA documentation master file, created by
+ sphinx-quickstart on Wed Jan 11 13:16:04 2023.
+
+Welcome to the MFIX-Exa PIC VVA Manual
+======================================
+
+.. toctree::
+ :maxdepth: 1
+ :caption: Contents:
+
+ intro
+
+Notice
+------
+
+Neither the United States Government nor any agency thereof, nor any of
+their employees, makes any warranty, expressed or implied, or assumes
+any legal liability or responsibility for the accuracy, completeness, or
+usefulness of any information, apparatus, product, or process disclosed
+or represents that its use would not infringe privately owned rights.
+
+- MFIX-Exa is provided without any user support for applications in the
+ user's immediate organization. It should not be redistributed in
+ whole or in part.
+
+- The use of MFIX-Exa is to be acknowledged in any published paper based on
+ computations using this software by citing this MFIX-Exa site.
+
+- The authors would appreciate receiving any reports of bugs or other
+ difficulties with the software, enhancements to the software, and
+ accounts of practical applications of this software.
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
diff --git a/docs/picvva/source/intro.rst b/docs/picvva/source/intro.rst
new file mode 100644
index 0000000000000000000000000000000000000000..cab86ec711b8e51671c1abd4455394110205c1f5
--- /dev/null
+++ b/docs/picvva/source/intro.rst
@@ -0,0 +1,31 @@
+Introduction
+============
+
+MFiX-Exa is a new massively parallel code for computing multiphase
+flow in which solid particles interact with the gas surrounding them. It is
+built on top of `AMReX`_, a publicly available software framework designed for
+building massively parallel block-structured adaptive mesh refinement (AMR)
+applications.
+
+MFiX-Exa relies on the same fundamental physics as in MFiX but the spatial and
+time discretizations differ. Specifically,
+
+- Fluid velocity is defined at cell centers; pressure is defined at nodes.
+- The advection algorithm includes an intermediate MAC projection for
+ face-centered advection velocities
+- Incompressibility of the fluid is imposed through the use of a projection at
+ the end of the time step
+- The representation of the complex geometry includes mesh refinement around
+ the fluid-solid interface, which is represented used the embedded boundary, or
+ cut-cell approach
+- Parallelization via flat MPI, OpenMP, hybrid MPI/OpenMP, or MPI/MPI.
+- Porting of MFiX-Exa to GPUs is in progress.
+- Parallel I/O using AMReX native I/O or HDF5.
+- Plotfile format supported by AmrVis, VisIt, ParaView, and yt.
+
+MFiX-Exa is being developed at NETL and LBNL as part of the U.S. Department of
+Energy's `Exascale Computing Project (ECP) `_
+MFiX-Exa heavily leverages `AMReX`_ which is also supported by ECP as part of
+the AMReX Co-Design Center.
+
+.. _AMReX: https://amrex-codes.github.io/
diff --git a/docs/webroot/index.html b/docs/webroot/index.html
index e44ce1e4d29aec45b1e1ce381211d4cffb5d46d8..e7d64919807f4adf97e02570efa83266a409322c 100644
--- a/docs/webroot/index.html
+++ b/docs/webroot/index.html
@@ -44,6 +44,9 @@
Gallery
+
+ PIC VVA
+