/[MITgcm]/manual/s_examples/rotating_tank/tank.tex
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revision 1.11 by edhill, Sat Oct 16 03:40:15 2004 UTC revision 1.17 by jmc, Fri Aug 27 13:25:32 2010 UTC
# Line 19  Line 19 
19  \begin{rawhtml}  \begin{rawhtml}
20  <!-- CMIREDIR:eg-tank: -->  <!-- CMIREDIR:eg-tank: -->
21  \end{rawhtml}  \end{rawhtml}
22    \begin{center}
23  This section illustrates an example of MITgcm simulating a laboratory  (in directory: {\it verification/rotating\_tank/})
24  experiment on much smaller scales than those commonly considered in    \end{center}
 geophysical  
 fluid dynamics.  
25    
26  \subsection{Overview}  \subsection{Overview}
27  \label{www:tutorials}  \label{www:tutorials}
28                                                                                                                                                              
29                                                                                    This example configuration demonstrates using the MITgcm to simulate a
30  This example configuration demonstrates using the MITgcm to simulate  laboratory demonstration using a differentially heated rotating
31  a laboratory demonstration using a rotating tank of water with an ice  annulus of water.  The simulation is configured for a laboratory scale
32  bucket in the center. The simulation is configured for a laboratory  on a $3^{\circ}\times1\mathrm{cm}$ cyclindrical grid with twenty-nine
33  scale on a  vertical levels of 0.5cm each.  This is a typical laboratory setup for
34  $3^{\circ}$ $\times$ 20cm  illustration principles of GFD, as well as for a laboratory data
35  cyclindrical grid with twenty-nine vertical  assimilation project. The files for this experiment can be found in
36  levels.  the verification directory under rotating\_tank.
37  \\  \\
38    
39  example illustration from GFD lab here  example illustration from GFD lab here
40  \\  \\
41    
# Line 51  example illustration from GFD lab here Line 50  example illustration from GFD lab here
50  \subsection{Discrete Numerical Configuration}  \subsection{Discrete Numerical Configuration}
51  \label{www:tutorials}  \label{www:tutorials}
52    
53   The domain is discretised with   The domain is discretised with a uniform cylindrical grid spacing in
54  a uniform cylindrical grid spacing in the horizontal set to  the horizontal set to $\Delta a=1$~cm and $\Delta \phi=3^{\circ}$, so
55   $\Delta a=1$~cm and $\Delta \phi=3^{\circ}$, so  that there are 120 grid cells in the azimuthal direction and
56  that there are 120 grid cells in the azimuthal direction and thirty-one grid cells in the radial. Vertically the  thirty-one grid cells in the radial, representing a tank 62cm in
57  model is configured with twenty-nine layers of uniform 0.5cm thickness.  diameter.  The bathymetry file sets the depth=0 in the nine lowest
58    radial rows to represent the central of the annulus.  Vertically the
59    model is configured with twenty-nine layers of uniform 0.5cm
60    thickness.
61  \\  \\
62  something about heat flux  something about heat flux
63    
# Line 89  are Line 91  are
91    
92  \begin{itemize}  \begin{itemize}
93    
94  \item Line 10, \begin{verbatim} viscAh=5.0E-6, \end{verbatim} this line sets  \item Lines 9-10, \begin{verbatim}
95  the Laplacian friction coefficient to $6 \times 10^{-6} m^2s^{-1}$,  viscAh=5.0E-6,
96  which is ususally  viscAz=5.0E-6,
97  low because of the small scale, presumably.... qqq  \end{verbatim}
98    
99  \item Line 19, \begin{verbatim}f0=0.5 , \end{verbatim} this line sets the  
100  coriolis term, and represents a tank spinning at 2/s  These lines set the Laplacian friction coefficient in the horizontal
101  \item Line 20, \begin{verbatim} beta=1.E-11, \end{verbatim} this line sets  and vertical, respectively.  Note that they are several orders of
102  $\beta$ (the gradient of the coriolis parameter, $f$) to $10^{-11} s^{-1}m^{-1}$  magnitude smaller than the other examples due to the small scale of
103    this example.
104    
105    \item Lines 13-16, \begin{verbatim}
106     diffKhT=2.5E-6,
107     diffKzT=2.5E-6,
108     diffKhS=1.0E-6,
109     diffKzS=1.0E-6,
110    
111    \end{verbatim}
112    
113    
114    These lines set horizontal and vertical diffusion coefficients for
115    temperature and salinity.  Similarly to the friction coefficients, the
116    values are a couple of orders of magnitude less than most
117     configurations.
118    
119  \item Lines 27 and 28  
120    \item Line 17, \begin{verbatim}f0=0.5 , \end{verbatim} this line sets the
121    coriolis term, and represents a tank spinning at about 2.4 rpm.
122    
123    \item Lines 23 and 24
124  \begin{verbatim}  \begin{verbatim}
125  rigidLid=.TRUE.,  rigidLid=.TRUE.,
126  implicitFreeSurface=.FALSE.,  implicitFreeSurface=.FALSE.,
127  \end{verbatim}  \end{verbatim}
128    
129  qqq these lines do the opposite of the following:  These lines activate  the rigid lid formulation of the surface
130  suppress the rigid lid formulation of the surface  pressure inverter and suppress the implicit free surface form
 pressure inverter and activate the implicit free surface form  
131  of the pressure inverter.  of the pressure inverter.
132    
133  \item Line 44,  \item Line 40,
134  \begin{verbatim}  \begin{verbatim}
135  nIter=0,  nIter=0,
136  \end{verbatim}  \end{verbatim}
137  this line indicates that the experiment should start from $t=0$  This line indicates that the experiment should start from $t=0$ and
138  and implicitly suppresses searching for checkpoint files associated  implicitly suppresses searching for checkpoint files associated with
139  with restarting an numerical integration from a previously saved state.  restarting an numerical integration from a previously saved state.
140    Instead, the file thetaPol.bin will be loaded to initialized the
141    temperature fields as indicated below, and other variables will be
142    initialized to their defaults.
143    
144  \item Line 47,  
145    \item Line 43,
146  \begin{verbatim}  \begin{verbatim}
147  deltaT=0.1,  deltaT=0.1,
148  \end{verbatim}  \end{verbatim}
149  This line sets the integration timestep to $0.1s$.  This is an unsually  This line sets the integration timestep to $0.1s$.  This is an
150  small value among the examples due to the small physical scale of the  unsually small value among the examples due to the small physical
151  experiment.  scale of the experiment.  Using the ensemble Kalman filter to produce
152    input fields can necessitate even shorter timesteps.
153    
154  \item Line 58,  \item Line 56,
155  \begin{verbatim}  \begin{verbatim}
156  usingCylindricalGrid=.TRUE.,  usingCylindricalGrid=.TRUE.,
157  \end{verbatim}  \end{verbatim}
158  This line requests that the simulation be performed in a  This line requests that the simulation be performed in a
159  cylindrical coordinate system.  cylindrical coordinate system.
160    
161  \item Line 60,  \item Line 57,
162  \begin{verbatim}  \begin{verbatim}
163  dXspacing=3,  dXspacing=3,
164  \end{verbatim}  \end{verbatim}
165  This line sets the azimuthal grid spacing between each $x$-coordinate line  This line sets the azimuthal grid spacing between each $x$-coordinate line
166  in the discrete grid. The syntax indicates that the discrete grid  in the discrete grid. The syntax indicates that the discrete grid
167  should be comprise of $120$ grid lines each separated by $3^{\circ}$.  should be comprised of $120$ grid lines each separated by $3^{\circ}$.
168                                                                                                                                                                  
169    
170    \item Line 58,
 \item Line 61,  
171  \begin{verbatim}  \begin{verbatim}
172  dYspacing=0.01,  dYspacing=0.01,
173  \end{verbatim}  \end{verbatim}
 This line sets the radial cylindrical grid spacing between each $a$-coordinate line  
 in the discrete grid to $1cm$.  
174    
175  \item Line 62,  This line sets the radial cylindrical grid spacing between each
176    $a$-coordinate line in the discrete grid to $1cm$.
177    
178    \item Line 59,
179  \begin{verbatim}  \begin{verbatim}
180  delZ=29*0.005,  delZ=29*0.005,
181  \end{verbatim}  \end{verbatim}
 This line sets the vertical grid spacing between each z-coordinate line  
 in the discrete grid to $5000m$ ($5$~km).  
182    
183  \item Line 68,  This line sets the vertical grid spacing between each of 29
184    z-coordinate lines in the discrete grid to $0.005m$ ($5$~mm).
185    
186    \item Line 64,
187  \begin{verbatim}  \begin{verbatim}
188  bathyFile='bathyPol.bin',  bathyFile='bathyPol.bin',
189  \end{verbatim}  \end{verbatim}
# Line 173  experiment, a depth of $0m$ indicates an Line 199  experiment, a depth of $0m$ indicates an
199  and a depth  and a depth
200  f $-0.145m$ indicates the tank itself.  f $-0.145m$ indicates the tank itself.
201    
202  \item Line 67,  \item Line 65,
203  \begin{verbatim}  \begin{verbatim}
204  hydrogThetaFile='thetaPol.bin',  hydrogThetaFile='thetaPol.bin',
205  \end{verbatim}  \end{verbatim}
# Line 183  are read. This file is a three-dimension Line 209  are read. This file is a three-dimension
209  ($x,y,z$) map and is enumerated and formatted in the same manner as the  ($x,y,z$) map and is enumerated and formatted in the same manner as the
210  bathymetry file.  bathymetry file.
211    
212  \item Line qqq  \item Lines 66 and 67
213  \begin{verbatim}  \begin{verbatim}
214   tCyl  = 0   tCylIn  = 0
215     tCylOut  = 20
216  \end{verbatim}  \end{verbatim}
217  This line specifies the temperature in degrees Celsius of the interior  These line specify the temperatures in degrees Celsius of the interior
218  wall of the tank -- usually a bucket of ice water.  and exterior walls of the tank -- typically taken to be icewater on
219    the inside and room temperature on the outside.
220    
221    
222  \end{itemize}  \end{itemize}
223    
224  \noindent other lines in the file {\it input/data} are standard values  \noindent Other lines in the file {\it input/data} are standard values
225  that are described in the MITgcm Getting Started and MITgcm Parameters  that are described in the MITgcm Getting Started and MITgcm Parameters
226  notes.  notes.
227    
228  \begin{small}  \begin{small}
229  \input{part3/case_studies/rotating_tank/input/data}  \input{s_examples/rotating_tank/input/data}
230  \end{small}  \end{small}
231    
232  \subsubsection{File {\it input/data.pkg}}  \subsubsection{File {\it input/data.pkg}}
# Line 251  axis aligned with the y-coordinate. Line 279  axis aligned with the y-coordinate.
279  \end{itemize}  \end{itemize}
280    
281  \begin{small}  \begin{small}
282  \input{part3/case_studies/rotating_tank/code/SIZE.h}  \input{s_examples/rotating_tank/code/SIZE.h}
283  \end{small}  \end{small}
284    
285  \subsubsection{File {\it code/CPP\_OPTIONS.h}}  \subsubsection{File {\it code/CPP\_OPTIONS.h}}
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