116 lines
3.7 KiB
C++
116 lines
3.7 KiB
C++
/**********************************************************************
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FILENAME: uiuc_getwind.cpp
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----------------------------------------------------------------------
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DESCRIPTION: sets V_airmass_north, _east, _down for use in LaRCsim
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STATUS: alpha version
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REFERENCES:
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HISTORY: 03/26/2003 initial release
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AUTHOR(S): Glen Dimock <dimock@uiuc.edu>
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Michael Selig <m-selig@uiuc.edu>
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VARIABLES:
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INPUTS:
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OUTPUTS:
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CALLED BY: uiuc_wrapper
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CALLS TO: none
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----------------------------------------------------------------------
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COPYRIGHT: (C) 2003 by Michael Selig
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**********************************************************************/
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/*
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UIUC wind gradient test code v0.1
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Returns wind vector as a function of altitude for a simple
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parabolic gradient profile
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Glen Dimock
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Last update: 020227
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*/
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#include "uiuc_getwind.h"
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#include "uiuc_aircraft.h"
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void uiuc_getwind()
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{
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/* Wind parameters */
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double zref = 300.; //Reference height (ft)
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double uref = 0; //Horizontal wind velocity at ref. height (ft/sec)
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// double uref = 11; //Horizontal wind velocity at ref. height (ft/sec)
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// double uref = 13; //Horizontal wind velocity at ref. height (ft/sec)
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// double uref = 20; //Horizontal wind velocity at ref. height (ft/sec), 13.63 mph
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// double uref = 22.5; //Horizontal wind velocity at ref. height (ft/sec), 15 mph
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// double uref = 60.; //Horizontal wind velocity at ref. height (ft/sec), 40 mph
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double ordref =-64.; //Horizontal wind ordinal from north (degrees)
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double zoff = 300.; //Z offset (ft) - wind is zero at and below this point
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double zcomp = 0.; //Vertical component (down is positive)
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/* double zref = 300.; //Reference height (ft) */
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/* double uref = 0.; //Horizontal wind velocity at ref. height (ft/sec) */
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/* double ordref = 0.; //Horizontal wind ordinal from north (degrees) */
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/* double zoff = 15.; //Z offset (ft) - wind is zero at and below this point */
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/* double zcomp = 0.; //Vertical component (down is positive) */
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/* Get wind vector */
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double windmag = 0; //Wind magnitude
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double a = 0; //Parabola: Altitude = a*windmag^2 + zoff
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a = zref/pow(uref,2.);
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if (Altitude >= zoff)
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windmag = sqrt(Altitude/a);
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else
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windmag = 0.;
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V_north_airmass = windmag * cos(ordref*3.14159/180.); //North component
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V_east_airmass = windmag * sin(ordref*3.14159/180.); //East component
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V_down_airmass = zcomp;
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return;
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}
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