/[MITgcm]/manual/s_examples/rotating_tank/tank.tex

Diff of /manual/s_examples/rotating_tank/tank.tex

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-revision 1.5 by afe,
Mon Jul 26 18:41:32 2004 UTC
+revision 1.7 by afe,
Mon Jul 26 21:09:47 2004 UTC
 Line 219 
 are
  \begin{itemize}
- \item Line 7, \begin{verbatim} viscAh=4.E2, \end{verbatim} this line sets
+ \item Line X, \begin{verbatim} viscAh=5.0E-6, \end{verbatim} this line sets
- the Laplacian friction coefficient to $400 m^2s^{-1}$
+ the Laplacian friction coefficient to $0.000006 m^2s^{-1}$, which is ususally
+ low because of the small scale, presumably.... qqq
+ \item Line X, \begin{verbatim}f0=0.5 , \end{verbatim} this line sets the
+ coriolis term, and represents a tank spinning at qqq
  \item Line 10, \begin{verbatim} beta=1.E-11, \end{verbatim} this line sets
  $\beta$ (the gradient of the coriolis parameter, $f$) to $10^{-11} s^{-1}m^{-1}$
  \item Lines 15 and 16
  \begin{verbatim}
- rigidLid=.FALSE.,
+ rigidLid=.TRUE.,
- implicitFreeSurface=.TRUE.,
+ implicitFreeSurface=.FALSE.,
  \end{verbatim}
- these lines suppress the rigid lid formulation of the surface
+ these lines do the opposite of the following:
+ suppress the rigid lid formulation of the surface
  pressure inverter and activate the implicit free surface form
  of the pressure inverter.
-Line 241 
 this line indicates that the experiment
+Line 247 
 this line indicates that the experiment
  and implicitly suppresses searching for checkpoint files associated
  with restarting an numerical integration from a previously saved state.
- \item Line 29,
- \begin{verbatim}
- endTime=12000,
- \end{verbatim}
- this line indicates that the experiment should start finish at $t=12000s$.
- A restart file will be written at this time that will enable the
- simulation to be continued from this point.
  \item Line 30,
  \begin{verbatim}
- deltaTmom=1200,
+ deltaT=0.1,
  \end{verbatim}
- This line sets the momentum equation timestep to $1200s$.
+ This line sets the integration timestep to $0.1s$.  This is an unsually
+ small value among the examples due to the small physical scale of the
+ experiment.
  \item Line 39,
  \begin{verbatim}
- usingCartesianGrid=.TRUE.,
+ usingCylindricalGrid=.TRUE.,
  \end{verbatim}
  This line requests that the simulation be performed in a
- Cartesian coordinate system.
+ cylindrical coordinate system.
- \item Line 41,
+ \item Line qqq,
  \begin{verbatim}
- delX=60*20E3,
+ dXspacing=3,
  \end{verbatim}
- This line sets the horizontal grid spacing between each x-coordinate line
+ This line sets the azimuthal grid spacing between each x-coordinate line
  in the discrete grid. The syntax indicates that the discrete grid
- should be comprise of $60$ grid lines each separated by $20 \times 10^{3}m$
+ should be comprise of $120$ grid lines each separated by $3^{\circ}$.
- ($20$~km).
- \item Line 42,
+ \item Line qqq,
  \begin{verbatim}
- delY=60*20E3,
+ dYspacing=0.01,
  \end{verbatim}
- This line sets the horizontal grid spacing between each y-coordinate line
+ This line sets the radial grid spacing between each $\rho$-coordinate line
- in the discrete grid to $20 \times 10^{3}m$ ($20$~km).
+ in the discrete grid to $1cm$.
  \item Line 43,
  \begin{verbatim}
- delZ=5000,
+ delZ=29*0.005,
  \end{verbatim}
  This line sets the vertical grid spacing between each z-coordinate line
  in the discrete grid to $5000m$ ($5$~km).
  \item Line 46,
  \begin{verbatim}
- bathyFile='topog.box'
+ bathyFile='bathyPol.bin',
  \end{verbatim}
  This line specifies the name of the file from which the domain
- bathymetry is read. This file is a two-dimensional ($x,y$) map of
+ ``bathymetry'' (tank depth) is read. This file is a two-dimensional
+ ($x,y$) map of
  depths. This file is assumed to contain 64-bit binary numbers
- giving the depth of the model at each grid cell, ordered with the x
+ giving the depth of the model at each grid cell, ordered with the $x$
  coordinate varying fastest. The points are ordered from low coordinate
- to high coordinate for both axes. The units and orientation of the
+ to high coordinate for both axes.  The units and orientation of the
  depths in this file are the same as used in the MITgcm code. In this
- experiment, a depth of $0m$ indicates a solid wall and a depth
+ experiment, a depth of $0m$ indicates an area outside of the tank
- of $-5000m$ indicates open ocean. The matlab program
+ and a depth
- {\it input/gendata.m} shows an example of how to generate a
+ f $-0.145m$ indicates the tank itself.
- bathymetry file.
  \item Line 49,
  \begin{verbatim}
- zonalWindFile='windx.sin_y'
+ hydrogThetaFile='thetaPol.bin',
  \end{verbatim}
- This line specifies the name of the file from which the x-direction
+ This line specifies the name of the file from which the initial values
- surface wind stress is read. This file is also a two-dimensional
+ of $\theta$
- ($x,y$) map and is enumerated and formatted in the same manner as the
+ are read. This file is a three-dimensional
- bathymetry file. The matlab program {\it input/gendata.m} includes example
+ ($x,y,z$) map and is enumerated and formatted in the same manner as the
- code to generate a valid {\bf zonalWindFile} file.
+ bathymetry file.
+ \item Line qqq
+ \begin{verbatim}
+  tCyl  = 0
+ \end{verbatim}
+ This line specifies the temperature in degrees Celsius of the interior
+ wall of the tank -- usually a bucket of ice water.
  \end{itemize}
-Line 334 
 customizations for this experiment.
+Line 342 
 customizations for this experiment.
  This file uses standard default values and does not contain
  customizations for this experiment.
- \subsubsection{File {\it input/windx.sin\_y}}
+ \subsubsection{File {\it input/thetaPol.bin}}
  \label{www:tutorials}
- The {\it input/windx.sin\_y} file specifies a two-dimensional ($x,y$)
+ The {\it input/thetaPol.bin} file specifies a three-dimensional ($x,y,z$)
- map of wind stress ,$\tau_{x}$, values. The units used are $Nm^{-2}$.
+ map of initial values of $\theta$ in degrees Celsius.
- Although $\tau_{x}$ is only a function of $y$n in this experiment
- this file must still define a complete two-dimensional map in order
- to be compatible with the standard code for loading forcing fields
- in MITgcm. The included matlab program {\it input/gendata.m} gives a complete
- code for creating the {\it input/windx.sin\_y} file.
- \subsubsection{File {\it input/topog.box}}
+ \subsubsection{File {\it input/bathyPol.bin}}
  \label{www:tutorials}
- The {\it input/topog.box} file specifies a two-dimensional ($x,y$)
+ The {\it input/bathyPol.bin} file specifies a two-dimensional ($x,y$)
  map of depth values. For this experiment values are either
- $0m$ or {\bf -delZ}m, corresponding respectively to a wall or to deep
+ $0m$ or {\bf -delZ}m, corresponding respectively to outside or inside of
- ocean. The file contains a raw binary stream of data that is enumerated
+ the tank. The file contains a raw binary stream of data that is enumerated
  in the same way as standard MITgcm two-dimensional, horizontal arrays.
- The included matlab program {\it input/gendata.m} gives a complete
- code for creating the {\it input/topog.box} file.
  \subsubsection{File {\it code/SIZE.h}}
  \label{www:tutorials}
-Line 365 
 Two lines are customized in this file fo
+Line 366 
 Two lines are customized in this file fo
  \begin{itemize}
  \item Line 39,
- \begin{verbatim} sNx=60, \end{verbatim} this line sets
+ \begin{verbatim} sNx=120, \end{verbatim} this line sets
  the lateral domain extent in grid points for the
  axis aligned with the x-coordinate.
  \item Line 40,
- \begin{verbatim} sNy=60, \end{verbatim} this line sets
+ \begin{verbatim} sNy=31, \end{verbatim} this line sets
  the lateral domain extent in grid points for the
  axis aligned with the y-coordinate.
  \end{itemize}
  \begin{small}
- \input{part3/case_studies/barotropic_gyre/code/SIZE.h}
+ \input{part3/case_studies/rotating_tank/code/SIZE.h}
  \end{small}
  \subsubsection{File {\it code/CPP\_OPTIONS.h}}

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