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source: palm/trunk/SOURCE/lpm_droplet_condensation.f90 @ 1350

Last change on this file since 1350 was 1347, checked in by heinze, 11 years ago
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[849]	1	SUBROUTINE lpm_droplet_condensation
	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	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[849]	20	! Current revisions:
	21	! ------------------
[1347]	22	!
	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: lpm_droplet_condensation.f90 1347 2014-03-27 13:23:00Z maronga $
	27	!
[1347]	28	! 1346 2014-03-27 13:18:20Z heinze
	29	! Bugfix: REAL constants provided with KIND-attribute especially in call of
	30	! intrinsic function like MAX, MIN, SIGN
	31	!
[1323]	32	! 1322 2014-03-20 16:38:49Z raasch
	33	! REAL constants defined as wp-kind
	34	!
[1321]	35	! 1320 2014-03-20 08:40:49Z raasch
[1320]	36	! ONLY-attribute added to USE-statements,
	37	! kind-parameters added to all INTEGER and REAL declaration statements,
	38	! kinds are defined in new module kinds,
	39	! comment fields (!:) to be used for variable explanations added to
	40	! all variable declaration statements
[1072]	41	!
[1319]	42	! 1318 2014-03-17 13:35:16Z raasch
	43	! module interfaces removed
	44	!
[1093]	45	! 1092 2013-02-02 11:24:22Z raasch
	46	! unused variables removed
	47	!
[1072]	48	! 1071 2012-11-29 16:54:55Z franke
[1071]	49	! Ventilation effect for evaporation of large droplets included
	50	! Check for unreasonable results included in calculation of Rosenbrock method
	51	! since physically unlikely results were observed and for the same
	52	! reason the first internal time step in Rosenbrock method should be < 1.0E02 in
	53	! case of evaporation
	54	! Unnecessary calculation of ql_int removed
	55	! Unnecessary calculations in Rosenbrock method (d2rdt2, drdt_m, dt_ros_last)
	56	! removed
	57	! Bugfix: factor in calculation of surface tension changed from 0.00155 to
	58	! 0.000155
[849]	59	!
[1037]	60	! 1036 2012-10-22 13:43:42Z raasch
	61	! code put under GPL (PALM 3.9)
	62	!
[850]	63	! 849 2012-03-15 10:35:09Z raasch
	64	! initial revision (former part of advec_particles)
[849]	65	!
[850]	66	!
[849]	67	! Description:
	68	! ------------
	69	! Calculates change in droplet radius by condensation/evaporation, using
	70	! either an analytic formula or by numerically integrating the radius growth
	71	! equation including curvature and solution effects using Rosenbrocks method
	72	! (see Numerical recipes in FORTRAN, 2nd edition, p. 731).
	73	! The analytical formula and growth equation follow those given in
	74	! Rogers and Yau (A short course in cloud physics, 3rd edition, p. 102/103).
	75	!------------------------------------------------------------------------------!
	76
[1320]	77	USE arrays_3d, &
	78	ONLY: hyp, pt, q, ql_c, ql_v, zu
[849]	79
[1320]	80	USE cloud_parameters, &
	81	ONLY: bfactor, curvature_solution_effects, diff_coeff_l, &
	82	eps_ros, l_d_rv, l_v, rho_l, r_v, thermal_conductivity_l
[849]	83
[1320]	84	USE constants, &
	85	ONLY: pi
[849]	86
[1320]	87	USE control_parameters, &
	88	ONLY: atmos_ocean_sign, dt_3d, dz, message_string, &
	89	molecular_viscosity, rho_surface
	90	USE cpulog, &
	91	ONLY: cpu_log, log_point_s
[849]	92
[1320]	93	USE grid_variables, &
	94	ONLY: dx, ddx, dy, ddy
[1071]	95
[1320]	96	USE lpm_collision_kernels_mod, &
	97	ONLY: rclass_lbound, rclass_ubound
[849]	98
[1320]	99	USE kinds
	100
	101	USE particle_attributes, &
	102	ONLY: hall_kernel, number_of_particles, offset_ocean_nzt, &
	103	offset_ocean_nzt_m1, particles, radius_classes, &
	104	use_kernel_tables, wang_kernel
	105
	106
	107	IMPLICIT NONE
	108
	109	INTEGER(iwp) :: i !:
	110	INTEGER(iwp) :: internal_timestep_count !:
	111	INTEGER(iwp) :: j !:
	112	INTEGER(iwp) :: jtry !:
	113	INTEGER(iwp) :: k !:
	114	INTEGER(iwp) :: n !:
	115	INTEGER(iwp) :: ros_count !:
	116
	117	INTEGER(iwp), PARAMETER :: maxtry = 40 !:
	118
	119	LOGICAL :: repeat !:
	120
	121	REAL(wp) :: aa !:
	122	REAL(wp) :: afactor !:
	123	REAL(wp) :: arg !:
	124	REAL(wp) :: bb !:
	125	REAL(wp) :: cc !:
	126	REAL(wp) :: dd !:
	127	REAL(wp) :: ddenom !:
	128	REAL(wp) :: delta_r !:
	129	REAL(wp) :: drdt !:
	130	REAL(wp) :: drdt_ini !:
	131	REAL(wp) :: dt_ros !:
	132	REAL(wp) :: dt_ros_next !:
	133	REAL(wp) :: dt_ros_sum !:
	134	REAL(wp) :: dt_ros_sum_ini !:
	135	REAL(wp) :: d2rdtdr !:
	136	REAL(wp) :: errmax !:
	137	REAL(wp) :: err_ros !:
	138	REAL(wp) :: g1 !:
	139	REAL(wp) :: g2 !:
	140	REAL(wp) :: g3 !:
	141	REAL(wp) :: g4 !:
	142	REAL(wp) :: e_a !:
	143	REAL(wp) :: e_s !:
	144	REAL(wp) :: gg !:
	145	REAL(wp) :: new_r !:
	146	REAL(wp) :: p_int !:
	147	REAL(wp) :: pt_int !:
	148	REAL(wp) :: pt_int_l !:
	149	REAL(wp) :: pt_int_u !:
	150	REAL(wp) :: q_int !:
	151	REAL(wp) :: q_int_l !:
	152	REAL(wp) :: q_int_u !:
	153	REAL(wp) :: r_ros !:
	154	REAL(wp) :: r_ros_ini !:
	155	REAL(wp) :: sigma !:
	156	REAL(wp) :: t_int !:
	157	REAL(wp) :: x !:
	158	REAL(wp) :: y !:
	159	REAL(wp) :: re_p !:
	160
[849]	161	!-- Parameters for Rosenbrock method
[1322]	162	REAL(wp), PARAMETER :: a21 = 2.0 !:
	163	REAL(wp), PARAMETER :: a31 = 48.0/25.0_wp !:
	164	REAL(wp), PARAMETER :: a32 = 6.0/25.0_wp !:
	165	REAL(wp), PARAMETER :: b1 = 19.0/9.0_wp !:
	166	REAL(wp), PARAMETER :: b2 = 0.5 !:
	167	REAL(wp), PARAMETER :: b3 = 25.0/108.0_wp !:
	168	REAL(wp), PARAMETER :: b4 = 125.0/108.0_wp !:
	169	REAL(wp), PARAMETER :: c21 = -8.0 !:
	170	REAL(wp), PARAMETER :: c31 = 372.0/25.0_wp !:
	171	REAL(wp), PARAMETER :: c32 = 12.0/5.0_wp !:
	172	REAL(wp), PARAMETER :: c41 = -112.0/125.0_wp !:
	173	REAL(wp), PARAMETER :: c42 = -54.0/125.0_wp !:
	174	REAL(wp), PARAMETER :: c43 = -2.0/5.0_wp !:
	175	REAL(wp), PARAMETER :: errcon = 0.1296 !:
	176	REAL(wp), PARAMETER :: e1 = 17.0/54.0_wp !:
	177	REAL(wp), PARAMETER :: e2 = 7.0/36.0_wp !:
	178	REAL(wp), PARAMETER :: e3 = 0.0 !:
	179	REAL(wp), PARAMETER :: e4 = 125.0/108.0_wp !:
	180	REAL(wp), PARAMETER :: gam = 0.5 !:
	181	REAL(wp), PARAMETER :: grow = 1.5 !:
	182	REAL(wp), PARAMETER :: pgrow = -0.25 !:
	183	REAL(wp), PARAMETER :: pshrnk = -1.0/3.0_wp !:
	184	REAL(wp), PARAMETER :: shrnk = 0.5 !:
[849]	185
	186
[1320]	187
[849]	188	CALL cpu_log( log_point_s(42), 'lpm_droplet_condens', 'start' )
	189
	190	DO n = 1, number_of_particles
	191	!
	192	!-- Interpolate temperature and humidity.
	193	!-- First determine left, south, and bottom index of the arrays.
	194	i = particles(n)%x * ddx
	195	j = particles(n)%y * ddy
	196	k = ( particles(n)%z + 0.5 * dz * atmos_ocean_sign ) / dz &
	197	+ offset_ocean_nzt ! only exact if equidistant
	198
	199	x = particles(n)%x - i * dx
	200	y = particles(n)%y - j * dy
	201	aa = x2 + y2
	202	bb = ( dx - x )2 + y2
	203	cc = x2 + ( dy - y )2
	204	dd = ( dx - x )2 + ( dy - y )2
	205	gg = aa + bb + cc + dd
	206
	207	pt_int_l = ( ( gg - aa ) * pt(k,j,i) + ( gg - bb ) * pt(k,j,i+1) &
	208	+ ( gg - cc ) * pt(k,j+1,i) + ( gg - dd ) * pt(k,j+1,i+1) &
	209	) / ( 3.0 * gg )
	210
	211	pt_int_u = ( ( gg-aa ) * pt(k+1,j,i) + ( gg-bb ) * pt(k+1,j,i+1) &
	212	+ ( gg-cc ) * pt(k+1,j+1,i) + ( gg-dd ) * pt(k+1,j+1,i+1) &
	213	) / ( 3.0 * gg )
	214
	215	pt_int = pt_int_l + ( particles(n)%z - zu(k) ) / dz * &
	216	( pt_int_u - pt_int_l )
	217
	218	q_int_l = ( ( gg - aa ) * q(k,j,i) + ( gg - bb ) * q(k,j,i+1) &
	219	+ ( gg - cc ) * q(k,j+1,i) + ( gg - dd ) * q(k,j+1,i+1) &
	220	) / ( 3.0 * gg )
	221
	222	q_int_u = ( ( gg-aa ) * q(k+1,j,i) + ( gg-bb ) * q(k+1,j,i+1) &
	223	+ ( gg-cc ) * q(k+1,j+1,i) + ( gg-dd ) * q(k+1,j+1,i+1) &
	224	) / ( 3.0 * gg )
	225
	226	q_int = q_int_l + ( particles(n)%z - zu(k) ) / dz * &
	227	( q_int_u - q_int_l )
	228
	229	!
	230	!-- Calculate real temperature and saturation vapor pressure
	231	p_int = hyp(k) + ( particles(n)%z - zu(k) ) / dz * ( hyp(k+1)-hyp(k) )
	232	t_int = pt_int * ( p_int / 100000.0 )**0.286
	233
	234	e_s = 611.0 * EXP( l_d_rv * ( 3.6609E-3 - 1.0 / t_int ) )
	235
	236	!
	237	!-- Current vapor pressure
	238	e_a = q_int * p_int / ( 0.378 * q_int + 0.622 )
	239
	240	!
	241	!-- Thermal conductivity for water (from Rogers and Yau, Table 7.1),
	242	!-- diffusivity for water vapor (after Hall und Pruppacher, 1976)
	243	thermal_conductivity_l = 7.94048E-05 * t_int + 0.00227011
	244	diff_coeff_l = 0.211E-4 * ( t_int / 273.15 )*1.94 &
	245	( 101325.0 / p_int)
	246	!
	247	!-- Change in radius by condensation/evaporation
[1071]	248	IF ( particles(n)%radius >= 4.0E-5 .AND. e_a/e_s < 1.0 ) THEN
[849]	249	!
[1071]	250	!-- Approximation for large radii, where curvature and solution effects
	251	!-- can be neglected but ventilation effect has to be included in case of
	252	!-- evaporation.
	253	!-- First calculate the droplet's Reynolds number
	254	re_p = 2.0 * particles(n)%radius * ABS( particles(n)%speed_z ) / &
	255	molecular_viscosity
	256	!
	257	!-- Ventilation coefficient after Rogers and Yau, 1989
	258	IF ( re_p > 2.5 ) THEN
	259	afactor = 0.78 + 0.28 * SQRT( re_p )
	260	ELSE
	261	afactor = 1.0 + 0.09 * re_p
	262	ENDIF
	263
	264	arg = particles(n)%radius*2 + 2.0 dt_3d * afactor * &
	265	( e_a / e_s - 1.0 ) / &
	266	( ( l_d_rv / t_int - 1.0 ) * l_v * rho_l / t_int / &
	267	thermal_conductivity_l + &
	268	rho_l * r_v * t_int / diff_coeff_l / e_s )
	269
	270	new_r = SQRT( arg )
	271
	272	ELSEIF ( particles(n)%radius >= 1.0E-6 .OR. &
	273	.NOT. curvature_solution_effects ) THEN
	274	!
	275	!-- Approximation for larger radii in case that curvature and solution
	276	!-- effects are neglected and ventilation effects does not play a role
[849]	277	arg = particles(n)%radius*2 + 2.0 dt_3d * &
	278	( e_a / e_s - 1.0 ) / &
	279	( ( l_d_rv / t_int - 1.0 ) * l_v * rho_l / t_int / &
	280	thermal_conductivity_l + &
	281	rho_l * r_v * t_int / diff_coeff_l / e_s )
	282	IF ( arg < 1.0E-16 ) THEN
	283	new_r = 1.0E-8
	284	ELSE
	285	new_r = SQRT( arg )
	286	ENDIF
	287	ENDIF
	288
	289	IF ( curvature_solution_effects .AND. &
	290	( ( particles(n)%radius < 1.0E-6 ) .OR. ( new_r < 1.0E-6 ) ) ) &
	291	THEN
	292	!
	293	!-- Curvature and solutions effects are included in growth equation.
	294	!-- Change in Radius is calculated with 4th-order Rosenbrock method
	295	!-- for stiff o.d.e's with monitoring local truncation error to adjust
	296	!-- stepsize (see Numerical recipes in FORTRAN, 2nd edition, p. 731).
	297	!-- For larger radii the simple analytic method (see ELSE) gives
	298	!-- almost the same results.
[1071]	299
	300	ros_count = 0
	301	repeat = .TRUE.
[849]	302	!
[1071]	303	!-- Carry out the Rosenbrock algorithm. In case of unreasonable results
	304	!-- the switch "repeat" will be set true and the algorithm will be carried
	305	!-- out again with the internal time step set to its initial (small) value.
	306	!-- Unreasonable results may occur if the external conditions, especially the
	307	!-- supersaturation, has significantly changed compared to the last PALM
	308	!-- timestep.
	309	DO WHILE ( repeat )
[849]	310
[1071]	311	repeat = .FALSE.
	312	!
	313	!-- Surface tension after (Straka, 2009)
	314	sigma = 0.0761 - 0.000155 * ( t_int - 273.15 )
[849]	315
[1071]	316	r_ros = particles(n)%radius
	317	dt_ros_sum = 0.0 ! internal integrated time (s)
	318	internal_timestep_count = 0
[849]	319
[1071]	320	ddenom = 1.0 / ( rho_l * r_v * t_int / ( e_s * diff_coeff_l ) + &
	321	( l_v / ( r_v * t_int ) - 1.0 ) * &
	322	rho_l * l_v / ( thermal_conductivity_l * t_int )&
	323	)
	324
	325	afactor = 2.0 * sigma / ( rho_l * r_v * t_int )
	326
[849]	327	!
[1071]	328	!-- Take internal time step values from the end of last PALM time step
	329	dt_ros_next = particles(n)%rvar1
	330
[849]	331	!
[1071]	332	!-- Internal time step should not be > 1.0E-2 in case of evaporation
	333	!-- because larger values may lead to secondary solutions which are
	334	!-- physically unlikely
	335	IF ( dt_ros_next > 1.0E-2 .AND. e_a/e_s < 1.0 ) THEN
	336	dt_ros_next = 1.0E-3
	337	ENDIF
[849]	338	!
[1071]	339	!-- If calculation of Rosenbrock method is repeated due to unreasonalble
	340	!-- results during previous try the initial internal time step has to be
	341	!-- reduced
	342	IF ( ros_count > 1 ) THEN
	343	dt_ros_next = dt_ros_next - ( 0.2 * dt_ros_next )
	344	ELSEIF ( ros_count > 5 ) THEN
[849]	345	!
[1071]	346	!-- Prevent creation of infinite loop
	347	message_string = 'ros_count > 5 in Rosenbrock method'
	348	CALL message( 'lpm_droplet_condensation', 'PA0018', 2, 2, &
	349	0, 6, 0 )
	350	ENDIF
	351
[849]	352	!
[1071]	353	!-- Internal time step must not be larger than PALM time step
	354	dt_ros = MIN( dt_ros_next, dt_3d )
	355	!
	356	!-- Integrate growth equation in time unless PALM time step is reached
	357	DO WHILE ( dt_ros_sum < dt_3d )
[849]	358
[1071]	359	internal_timestep_count = internal_timestep_count + 1
[849]	360
	361	!
[1071]	362	!-- Derivative at starting value
	363	drdt = ddenom / r_ros * ( e_a / e_s - 1.0 - afactor / r_ros + &
	364	bfactor / r_ros**3 )
	365	drdt_ini = drdt
	366	dt_ros_sum_ini = dt_ros_sum
	367	r_ros_ini = r_ros
[849]	368
	369	!
[1071]	370	!-- Calculate radial derivative of dr/dt
	371	d2rdtdr = ddenom * ( ( 1.0 - e_a/e_s ) / r_ros**2 + &
	372	2.0 * afactor / r_ros**3 - &
	373	4.0 * bfactor / r_ros**5 )
[849]	374	!
[1071]	375	!-- Adjust stepsize unless required accuracy is reached
	376	DO jtry = 1, maxtry+1
[849]	377
[1071]	378	IF ( jtry == maxtry+1 ) THEN
	379	message_string = 'maxtry > 40 in Rosenbrock method'
	380	CALL message( 'lpm_droplet_condensation', 'PA0347', 2, 2, &
	381	0, 6, 0 )
	382	ENDIF
[849]	383
[1071]	384	aa = 1.0 / ( gam * dt_ros ) - d2rdtdr
	385	g1 = drdt_ini / aa
	386	r_ros = r_ros_ini + a21 * g1
	387	drdt = ddenom / r_ros * ( e_a / e_s - 1.0 - &
	388	afactor / r_ros + &
	389	bfactor / r_ros**3 )
[849]	390
[1071]	391	g2 = ( drdt + c21 * g1 / dt_ros )&
	392	/ aa
	393	r_ros = r_ros_ini + a31 * g1 + a32 * g2
	394	drdt = ddenom / r_ros * ( e_a / e_s - 1.0 - &
	395	afactor / r_ros + &
	396	bfactor / r_ros**3 )
[849]	397
[1071]	398	g3 = ( drdt + &
	399	( c31 * g1 + c32 * g2 ) / dt_ros ) / aa
	400	g4 = ( drdt + &
	401	( c41 * g1 + c42 * g2 + c43 * g3 ) / dt_ros ) / aa
	402	r_ros = r_ros_ini + b1 * g1 + b2 * g2 + b3 * g3 + b4 * g4
[849]	403
[1071]	404	dt_ros_sum = dt_ros_sum_ini + dt_ros
[849]	405
[1071]	406	IF ( dt_ros_sum == dt_ros_sum_ini ) THEN
	407	message_string = 'zero stepsize in Rosenbrock method'
	408	CALL message( 'lpm_droplet_condensation', 'PA0348', 2, 2, &
	409	0, 6, 0 )
	410	ENDIF
[849]	411	!
[1071]	412	!-- Calculate error
	413	err_ros = e1g1 + e2g2 + e3g3 + e4g4
	414	errmax = 0.0
	415	errmax = MAX( errmax, ABS( err_ros / r_ros_ini ) ) / eps_ros
[849]	416	!
[1071]	417	!-- Leave loop if accuracy is sufficient, otherwise try again
	418	!-- with a reduced stepsize
	419	IF ( errmax <= 1.0 ) THEN
	420	EXIT
	421	ELSE
	422	dt_ros = SIGN( MAX( ABS( 0.9 * dt_ros * errmax**pshrnk ), &
	423	shrnk * ABS( dt_ros ) ), dt_ros )
	424	ENDIF
	425
	426	ENDDO ! loop for stepsize adjustment
	427
	428	!
	429	!-- Calculate next internal time step
	430	IF ( errmax > errcon ) THEN
	431	dt_ros_next = 0.9 * dt_ros * errmax**pgrow
[849]	432	ELSE
[1071]	433	dt_ros_next = grow * dt_ros
[849]	434	ENDIF
	435
[1071]	436	!
	437	!-- Estimated time step is reduced if the PALM time step is exceeded
	438	IF ( ( dt_ros_next + dt_ros_sum ) >= dt_3d ) THEN
	439	dt_ros = dt_3d - dt_ros_sum
	440	ELSE
	441	dt_ros = dt_ros_next
	442	ENDIF
[849]	443
[1071]	444	ENDDO
[849]	445	!
[1071]	446	!-- Store internal time step value for next PALM step
	447	particles(n)%rvar1 = dt_ros_next
[849]	448
[1071]	449	new_r = r_ros
[849]	450	!
[1071]	451	!-- Radius should not fall below 1E-8 because Rosenbrock method may
	452	!-- lead to errors otherwise
[1346]	453	new_r = MAX( new_r, 1.0E-8_wp )
[1071]	454	!
	455	!-- Check if calculated droplet radius change is reasonable since in
	456	!-- case of droplet evaporation the Rosenbrock method may lead to
	457	!-- secondary solutions which are physically unlikely.
	458	!-- Due to the solution effect the droplets may grow for relative
	459	!-- humidities below 100%, but change of radius should not be too large.
	460	!-- In case of unreasonable droplet growth the Rosenbrock method is
	461	!-- recalculated using a smaller initial time step.
	462	!-- Limiting values are tested for droplets down to 1.0E-7
	463	IF ( new_r - particles(n)%radius >= 3.0E-7 .AND. &
	464	e_a/e_s < 0.97 ) THEN
	465	ros_count = ros_count + 1
	466	repeat = .TRUE.
[849]	467	ENDIF
	468
[1071]	469	ENDDO ! Rosenbrock method
[849]	470
	471	ENDIF
	472
	473	delta_r = new_r - particles(n)%radius
	474
	475	!
	476	!-- Sum up the change in volume of liquid water for the respective grid
	477	!-- volume (this is needed later in lpm_calc_liquid_water_content for
	478	!-- calculating the release of latent heat)
	479	i = ( particles(n)%x + 0.5 * dx ) * ddx
	480	j = ( particles(n)%y + 0.5 * dy ) * ddy
	481	k = particles(n)%z / dz + 1 + offset_ocean_nzt_m1
	482	! only exact if equidistant
	483
	484	ql_c(k,j,i) = ql_c(k,j,i) + particles(n)%weight_factor * &
	485	rho_l * 1.33333333 * pi * &
	486	( new_r3 - particles(n)%radius3 ) / &
	487	( rho_surface * dx * dy * dz )
	488	IF ( ql_c(k,j,i) > 100.0 ) THEN
	489	WRITE( message_string, * ) 'k=',k,' j=',j,' i=',i, &
	490	' ql_c=',ql_c(k,j,i), ' &part(',n,')%wf=', &
	491	particles(n)%weight_factor,' delta_r=',delta_r
	492	CALL message( 'lpm_droplet_condensation', 'PA0143', 2, 2, -1, 6, 1 )
	493	ENDIF
	494
	495	!
	496	!-- Change the droplet radius
	497	IF ( ( new_r - particles(n)%radius ) < 0.0 .AND. new_r < 0.0 ) &
	498	THEN
	499	WRITE( message_string, * ) '#1 k=',k,' j=',j,' i=',i, &
	500	' e_s=',e_s, ' e_a=',e_a,' t_int=',t_int, &
	501	' &delta_r=',delta_r, &
	502	' particle_radius=',particles(n)%radius
	503	CALL message( 'lpm_droplet_condensation', 'PA0144', 2, 2, -1, 6, 1 )
	504	ENDIF
	505
	506	!
	507	!-- Sum up the total volume of liquid water (needed below for
	508	!-- re-calculating the weighting factors)
	509	ql_v(k,j,i) = ql_v(k,j,i) + particles(n)%weight_factor * new_r**3
	510
	511	particles(n)%radius = new_r
	512
	513	!
	514	!-- Determine radius class of the particle needed for collision
	515	IF ( ( hall_kernel .OR. wang_kernel ) .AND. use_kernel_tables ) &
	516	THEN
	517	particles(n)%class = ( LOG( new_r ) - rclass_lbound ) / &
	518	( rclass_ubound - rclass_lbound ) * &
	519	radius_classes
	520	particles(n)%class = MIN( particles(n)%class, radius_classes )
	521	particles(n)%class = MAX( particles(n)%class, 1 )
	522	ENDIF
	523
	524	ENDDO
	525
	526	CALL cpu_log( log_point_s(42), 'lpm_droplet_condens', 'stop' )
	527
	528
	529	END SUBROUTINE lpm_droplet_condensation

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