Changeset 4774


Ignore:
Timestamp:
2014-09-18T14:36:51+02:00 (6 years ago)
Author:
timgraham
Message:

Updated documentation to describe new diagnostics.

Location:
branches/2014/dev_r4650_UKMO12_CFL_diags_take2/DOC/TexFiles
Files:
3 edited

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  • branches/2014/dev_r4650_UKMO12_CFL_diags_take2/DOC/TexFiles/Chapters/Chap_DIA.tex

    r4153 r4774  
    13861386\\ 
    13871387 
     1388\section{Courant numbers} 
     1389Courant numbers provide a theoretical indication of the model's numerical stability. The advective Courant numbers can be calculated according to 
     1390\begin{equation} 
     1391\label{eq:CFL} 
     1392C_u = |u|\frac{\rdt}{e_{1u}}, \quad C_v = |v|\frac{\rdt}{e_{2v}}, \quad C_w = |w|\frac{\rdt}{e_{3w}} 
     1393\end{equation} 
     1394in the zonal, meridional and vertical directions respectively. The vertical component is included although it is not strictly valid as the vertical velocity is calculated from the continuity equation rather than as a prognostic variable. Physically this represents the rate at which information is propogated across a grid cell. Values greater than 1 indicate that information is propagated across more than one grid cell in a single time step. 
     1395 
     1396The variables can be activated by setting the \np{nn\_diacfl} namelist parameter to 1 in the \ngn{namctl} namelist. The diagnostics will be written out to an ascii file named cfl\_diagnostics.ascii. In this file the maximum value of $C_u$, $C_v$, and $C_w$ are printed at each timestep along with the coordinates of where the maximum value occurs. At the end of the model run the maximum value of $C_u$, $C_v$, and $C_w$ for the whole model run is printed along with the coordinates of each. The maximum values from the run are also copied to the ocean.output file.  
    13881397 
    13891398 
  • branches/2014/dev_r4650_UKMO12_CFL_diags_take2/DOC/TexFiles/Chapters/Chap_DYN.tex

    r4560 r4774  
    795795%>   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   >   > 
    796796\begin{figure}[!t]    \begin{center} 
    797 \includegraphics[width=0.7\textwidth]{./TexFiles/Figures/Fig_time_split.pdf} 
     797\includegraphics[width=0.7\textwidth]{./TexFiles/Figures/Fig_DYN_dynspg_ts.pdf} 
    798798\caption{  \label{Fig_DYN_dynspg_ts} 
    799799Schematic of the split-explicit time stepping scheme for the external  
  • branches/2014/dev_r4650_UKMO12_CFL_diags_take2/DOC/TexFiles/Namelist/namctl

    r4147 r4774  
    1313                           !     (no physical validity of the results) 
    1414   nn_timing   =    0      !  timing by routine activated (=1) creates timing.output file, or not (=0) 
     15   nn_diacfl   =    0      !  Write out cfl diagnostics (=1) in cfl_diagnostics.ascii, or not (=0) 
    1516/ 
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