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source: palm/trunk/SOURCE/lpm_droplet_condensation.f90 @ 1322

Last change on this file since 1322 was 1322, checked in by raasch, 10 years ago
REAL functions and a lot of REAL constants provided with KIND-attribute, some small bugfixes
Property svn:keywords set to `Id`
File size: 21.6 KB

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

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