[6] | 1 | !********************************************************************** |
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| 2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
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| 3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
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| 4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
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| 5 | ! * |
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| 6 | ! This file is part of FLEXPART. * |
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| 7 | ! * |
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| 8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
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| 9 | ! it under the terms of the GNU General Public License as published by* |
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| 10 | ! the Free Software Foundation, either version 3 of the License, or * |
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| 11 | ! (at your option) any later version. * |
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| 12 | ! * |
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| 13 | ! FLEXPART is distributed in the hope that it will be useful, * |
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| 14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 16 | ! GNU General Public License for more details. * |
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| 17 | ! * |
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| 18 | ! You should have received a copy of the GNU General Public License * |
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| 19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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| 20 | !********************************************************************** |
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| 21 | |
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| 22 | ! Function calculates dynamic viscosity of air (kg/m/s) as function of |
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| 23 | ! temperature (K) using Sutherland's formula |
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| 24 | |
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| 25 | real function viscosity(t) |
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| 26 | |
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| 27 | implicit none |
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| 28 | |
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| 29 | real :: t |
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| 30 | real,parameter :: c=120.,t_0=291.15,eta_0=1.827e-5 |
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| 31 | |
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| 32 | viscosity=eta_0*(t_0+c)/(t+c)*(t/t_0)**1.5 |
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| 33 | |
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| 34 | return |
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| 35 | |
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| 36 | end function viscosity |
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