source: trunk/src/dynamic_viscosity.f90 @ 28

Last change on this file since 28 was 4, checked in by mlanger, 9 years ago
File size: 1.7 KB
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1!**********************************************************************
2! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010         *
3! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa,             *
4! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann   *
5!                                                                     *
6! This file is part of FLEXPART.                                      *
7!                                                                     *
8! FLEXPART is free software: you can redistribute it and/or modify    *
9! it under the terms of the GNU General Public License as published by*
10! the Free Software Foundation, either version 3 of the License, or   *
11! (at your option) any later version.                                 *
12!                                                                     *
13! FLEXPART is distributed in the hope that it will be useful,         *
14! but WITHOUT ANY WARRANTY; without even the implied warranty of      *
15! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the       *
16! GNU General Public License for more details.                        *
17!                                                                     *
18! You should have received a copy of the GNU General Public License   *
19! along with FLEXPART.  If not, see <http://www.gnu.org/licenses/>.   *
20!**********************************************************************
21
22! Function calculates dynamic viscosity of air (kg/m/s) as function of
23! temperature (K) using Sutherland's formula
24
25real function viscosity(t)
26
27  implicit none
28
29  real :: t
30  real,parameter :: c=120.,t_0=291.15,eta_0=1.827e-5
31
32  viscosity=eta_0*(t_0+c)/(t+c)*(t/t_0)**1.5
33
34  return
35
36end function viscosity
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