WRF Dynamics
============

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WRF Dynamics Contents
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`Dynamics Overview`_ |br|
`Hybrid Vertical Coordinate`_ |br|
Diffusion_ |br|
Damping_ |br|
Advection_ |br|
`Other Dynamics Options`_ |br|
`Lateral Boundary Conditions`_

.. _`Dynamics Overview`: dynamics.html
.. _`Hybrid Vertical Coordinate`: hybrid_vert_coord.html
.. _Diffusion: diffusion.html
.. _Damping: damping.html
.. _Advection: advection.html
.. _`Other Dynamics Options`: other_dynamics.html
.. _`Lateral Boundary Conditions`: lat_bdy_conditions.html 

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Dynamics Overview
-----------------

The Advanced Research WRF (WRF-ARW) model uses a dynamical solver to perform time and space integration of the equations of motion. The equations are integrated forward in time to produce a forecast. Since the equations cannot be solved analytically, they are discretized on a grid and computed for approximate solutions. The accuracy of solutions depends on the numerical method and mesh spacing (i.e., the grid). The WRF model uses a hybrid terrain-following mass coordinate system and a 3rd-order Runge-Kutta time integration scheme. Grid-staggering is done on a C-grid, where U and V are calculated on the west/east (U) and south/north (V) intersections of each grid cell. Vertical motion is calculated at the bottom and top intersections of grid cells. All other variables are processed in the center (mass) point of each grid. Several dynamical filters are available as run-time options. 

For additional details regarding the equations that drive the model, see the latest version of the `WRF-ARW Technical Note`_ and/or the WRF Tutorial `WRF Tutorial Dynamics presentation`_. 

.. _`WRF-ARW Technical Note`: https://www2.mmm.ucar.edu/wrf/users/docs/technote/contents.html
.. _`WRF Tutorial Dynamics presentation`: https://www2.mmm.ucar.edu/wrf/users/tutorial/presentation_pdfs/202101/skamarock_dynamics.pdf

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