source: palm/trunk/SOURCE/init_cloud_physics.f90 @ 1095

Last change on this file since 1095 was 1066, checked in by hoffmann, 12 years ago

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[1]1 SUBROUTINE init_cloud_physics
2
[1036]3!--------------------------------------------------------------------------------!
4! This file is part of PALM.
5!
6! PALM is free software: you can redistribute it and/or modify it under the terms
7! of the GNU General Public License as published by the Free Software Foundation,
8! either version 3 of the License, or (at your option) any later version.
9!
10! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
11! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
12! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
13!
14! You should have received a copy of the GNU General Public License along with
15! PALM. If not, see <http://www.gnu.org/licenses/>.
16!
17! Copyright 1997-2012  Leibniz University Hannover
18!--------------------------------------------------------------------------------!
19!
[484]20! Current revisions:
[1]21! -----------------
[1054]22!
23! Former revisions:
24! ------------------
25! $Id: init_cloud_physics.f90 1066 2012-11-22 17:52:43Z raasch $
26!
[1066]27! 1065 2012-11-22 17:42:36Z hoffmann
28! The Courant number of sedimentation can be controlled with c_sedimentation.
29!
[1054]30! 1053 2012-11-13 17:11:03Z hoffmann
[1053]31! calculation of the maximum timestep according to the terminal velocity of rain
32! drops in the two moment cloud scheme
[1]33!
[1053]34! calculation of frequently used constants (pirho_l, dpirho_l, schmidt_p_1d3,
35! hyrho)
36!
[1037]37! 1036 2012-10-22 13:43:42Z raasch
38! code put under GPL (PALM 3.9)
39!
[826]40! 824 2012-02-17 09:09:57Z raasch
41! calculation of b_cond replaced by calculation of bfactor
42!
[226]43! 221 2009-01-12 15:32:23Z raasch
44! Bugfix: abort in case that absolute temperature is below zero
45!
[98]46! 95 2007-06-02 16:48:38Z raasch
47! hydro_press renamed hyp
48!
49! February 2007
[3]50! RCS Log replace by Id keyword, revision history cleaned up
51!
[1]52! Revision 1.5  2005/06/26 19:55:58  raasch
53! Initialization of cloud droplet constants, gas_constant renamed r_d,
54! latent_heat renamed l_v
55!
56! Revision 1.1  2000/04/13 14:37:22  schroeter
57! Initial revision
58!
59!
60! Description:
61! ------------
62! Initialization of parameters for handling cloud-physics
63!------------------------------------------------------------------------------!
64
65    USE arrays_3d
66    USE cloud_parameters
[824]67    USE constants
[1]68    USE control_parameters
69    USE grid_variables
70    USE indices
71
72    IMPLICIT NONE
73
74    INTEGER ::  k
75    REAL    ::  t_surface
76
[1053]77    ALLOCATE( hyp(nzb:nzt+1), pt_d_t(nzb:nzt+1), t_d_pt(nzb:nzt+1),  &
78              hyrho(nzb:nzt+1) )
[1]79
80!
[824]81!-- Calculate frequently used parameters
[1]82    l_d_cp = l_v / cp
83    l_d_r  = l_v / r_d
84    l_d_rv = l_v / r_v
[1053]85
86    schmidt_p_1d3 = schmidt**( 1.0 / 3.0 )
87
88    pirho_l  = pi * rho_l / 6.0
89    dpirho_l = 1.0 / pirho_l 
[1]90!
[1053]91!-- Calculate timestep according to precipitation
92    IF ( icloud_scheme == 0  .AND.  precipitation )  THEN
[1065]93       dt_precipitation = c_sedimentation * MINVAL( dzu(nzb+2:nzt) ) /        &
94                          w_precipitation
[1053]95    ENDIF
96!
[824]97!-- Calculate factor used in equation for droplet growth by condensation
98    bfactor = 3.0 * vanthoff * mass_of_solute * molecular_weight_of_water &
99              / ( 4.0 * pi * rho_l * molecular_weight_of_solute )
[1]100!
101!-- Calculate:
102!-- pt / t : ratio of potential and actual temperature (pt_d_t)
103!-- t / pt : ratio of actual and potential temperature (t_d_pt)
[95]104!-- p_0(z) : vertical profile of the hydrostatic pressure (hyp)
[1]105    t_surface = pt_surface * ( surface_pressure / 1000.0 )**0.286
106    DO  k = nzb, nzt+1
[221]107!
108!--    Check temperature in case of too large domain height
109       IF ( ( t_surface - g/cp * zu(k) ) < 0.0 )  THEN
110          WRITE( message_string, * )  'absolute temperature < 0.0 at zu(', k, &
111                                      ') = ', zu(k)
[226]112          CALL message( 'init_cloud_physics', 'PA0142', 1, 2, 0, 6, 0 )
[221]113       ENDIF
[95]114       hyp(k)    = surface_pressure * 100.0 * &
115                   ( (t_surface - g/cp * zu(k)) / t_surface )**(1.0/0.286)
116       pt_d_t(k) = ( 100000.0 / hyp(k) )**0.286
[1053]117       t_d_pt(k) = 1.0 / pt_d_t(k)
118       hyrho(k)  = hyp(k) / ( r_d * t_d_pt(k) * pt_init(k) )       
[1]119    ENDDO
120
121!
122!-- Compute reference density
123    rho_surface = surface_pressure * 100.0 / ( r_d * t_surface )
124
125
126 END SUBROUTINE init_cloud_physics
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