\section{Purpose}
\label{sec:purpose}

This document describes the wind loads that the GMTO Mount Element is providing
to the mount vendor.

\section{Introduction}

Following the mount PDR\cite{MOUNT-PDR}, the CFD telescope model has been updated to take
into account the numerous design changes.
The updated CFD model is described in GMT-DOC--05211\cite{GMT.DOC.05211}.

The mount wind loads are detailed in  chapter~\ref{cfd-wind-loads}.
All the different cases correspond to the telescope pointing at a 30 degree zenith angle.
The telescope azimuth is given with respect to the 30$^o$-NNE predominant wind
direction at the GMT site.
The enclosure configuration is either vents open and wind screen stowed (OS) for the
2m/s and 7m/s cases or vents closed and wind screen deployed (CD) for the 12m/s
cases.
Table~\ref{tab:cases} identifies the CFD cases for the mount wind loads.
\begin{table}
  \centering
  \begin{tabular}{c|ccc}\toprule
    Azimuth [degree]  & 2m/s (OS) & 7m/s (OS) & 12m/s (CD) \\\midrule
      0               & \checkmark& \checkmark& \checkmark \\
     45               & \checkmark& \checkmark& \checkmark \\
     90               & \checkmark& \checkmark& \checkmark \\
    135               & & \checkmark&  \\
    180               & & & \checkmark \\\bottomrule
  \end{tabular}
  \caption{CFD settings for the mount wind loads cases.}
  \label{tab:cases}
\end{table}
The definition of the wind load cases according to the mount nomenclature can be found in Table~\ref{tab:mount-cases}.
\begin{table}
  \centering
  \begin{tabular}{cccc}\toprule
    & Wind speed & Azimuth & Enclosure\\
    & [m/s]       & [deg]   & - \\\midrule
    WLC0023 &  2  &  45     & OS \\
    WLC0024 &  2  &  90     & OS \\
    WLC0025 &  2  &   0     & OS \\
    WLC0026 &  7  &  45     & OS \\
    WLC0027 &  7  &  90     & OS \\
    WLC0028 &  7  & 135     & OS \\
    WLC0029 & 12  &   0     & CD \\
    WLC0030 & 12  &  90     & CD \\
    WLC0031 &  7  &   0     & OS \\
    WLC0032 & 12  & 180     & CD \\
    WLC0033 & 12  &   0     & CD \\
    WLC0034 & 12  &  45     & CD \\
    \bottomrule
  \end{tabular}
  \caption{CFD cases definition according to the mount wind loads nomenclature.}
  \label{tab:mount-cases}
\end{table}



%% Wind load as a function of wind speed:

%% \begin{tabular}{c|ccc}\toprule
%%  Wind [m/s] & 0 deg. & 45 deg. & 90 deg. \\\midrule
%%   \multicolumn{4}{c}{Left shutter} \\\midrule
%%      2  & 233  & 366 & 450 \\
%%      7   & 212  & 362 & 435 \\
%%     12   & 261  & 406 & 555 \\\midrule
%%   \multicolumn{4}{c}{Right shutter} \\\midrule
%%      2   & 226  & 305 & 182 \\
%%      7   & 221  & 336 & 175 \\
%%     12   & 261  & 416 & 191 \\\bottomrule
%%   \end{tabular}
 
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