[8a65cb0] | 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 | subroutine re_initialize_particle(zp,ust,wst,h,sigmaw,wp,nrand,ol) |
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| 23 | ! i i i i i io io i |
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| 24 | !=============== CBL skewed vertical profiles and formulation of LHH 1996 with profile of w3 from lHB 2000 ====== |
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| 25 | !=============== LHH formulation has been modified to account for variable density profiles and backward in time or forward in time simulations ====== |
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| 26 | !=============== this routine re-initiaalize particle velocity if a numerical instability in the cbl scheme generated a NaN value ====== |
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| 27 | !=============== the particle velocity is extracted from the updraft and downdraft distribution as required ====== |
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| 28 | !=============== the re-initialization si not perfect see e.g. Cassiani et al(2015) BLM ====== |
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| 29 | !====================================================================================================================================================== |
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| 30 | !====================================================================================================================================================== |
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| 31 | use par_mod, only:pi |
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| 32 | use com_mod, only:ldirect,rannumb |
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| 33 | |
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| 34 | implicit none |
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| 35 | |
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| 36 | |
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| 37 | real :: usurad2,usurad2p,C0,costluar4,eps |
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| 38 | parameter (usurad2=0.7071067812,usurad2p=0.3989422804,C0=2,costluar4=0.66667,eps=0.000001) |
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| 39 | |
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| 40 | integer idum,nrand |
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| 41 | real :: wp,zp,ust,wst,h,dens,ddens,sigmaw,dsigmawdz,tlw,dcas,dcas1 !,ran3,gasdev |
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| 42 | real :: w3,w2 |
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| 43 | real :: z, & |
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| 44 | skew, & |
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| 45 | skew2, & |
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| 46 | radw2, & |
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| 47 | fluarw,fluarw2, & |
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| 48 | rluarw, & |
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| 49 | xluarw, & |
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| 50 | aluarw, & |
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| 51 | bluarw, & |
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| 52 | sigmawa, & |
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| 53 | sigmawb, & |
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| 54 | ath, & |
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| 55 | bth, & |
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| 56 | wb,wa |
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| 57 | real timedir |
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| 58 | real ol,transition |
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| 59 | |
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| 60 | !--------------------------------------------------------------------------- |
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| 61 | !timedir direction of time forward (1) or backward(-1) |
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| 62 | nrand=nrand+1 |
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| 63 | dcas1=rannumb(nrand) |
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| 64 | timedir=ldirect |
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| 65 | z=zp/h |
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| 66 | transition=1. |
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| 67 | |
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| 68 | if (-h/ol.lt.15) transition=((sin((((-h/ol)+10.)/10.)*pi)))/2.+0.5 |
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| 69 | |
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| 70 | w2=sigmaw*sigmaw |
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| 71 | w3=(((1.2*z*((1.-z)**(3./2.)))+eps)*wst**3)*transition |
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| 72 | skew=w3/(w2**1.5) |
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| 73 | skew2=skew*skew |
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| 74 | radw2=sqrt(w2) !sigmaw |
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| 75 | |
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| 76 | fluarw=costluar4*skew**0.333333333333333 |
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| 77 | fluarw2=fluarw*fluarw |
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| 78 | rluarw=(1.+fluarw2)**3.*skew2/((3.+fluarw2)**2.*fluarw2) !-> r |
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| 79 | xluarw=rluarw**0.5 !(1.+fluarw2)**1.5*skew/((3.+fluarw2)*fluarw) !----> r^1/2 |
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| 80 | |
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| 81 | aluarw=0.5*(1.-xluarw/(4.+rluarw)**0.5) |
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| 82 | bluarw=1.-aluarw |
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| 83 | |
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| 84 | sigmawa=radw2*(bluarw/(aluarw*(1.+fluarw2)))**0.5 |
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| 85 | sigmawb=radw2*(aluarw/(bluarw*(1.+fluarw2)))**0.5 |
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| 86 | |
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| 87 | wa=(fluarw*sigmawa) |
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| 88 | wb=(fluarw*sigmawb) |
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| 89 | |
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| 90 | |
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| 91 | |
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| 92 | if ((sign(1.,wp)*timedir).gt.0) then !updraft |
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| 93 | 100 wp=(dcas1*sigmawa+wa) |
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| 94 | if (wp.lt.0) then |
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| 95 | nrand=nrand+1 |
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| 96 | dcas1=rannumb(nrand) |
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| 97 | goto 100 |
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| 98 | end if |
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| 99 | wp=wp*timedir |
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| 100 | else if ((sign(1.,wp)*timedir).lt.0) then !downdraft |
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| 101 | 101 wp=(dcas1*sigmawb-wb) |
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| 102 | if (wp.gt.0) then |
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| 103 | nrand=nrand+1 |
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| 104 | dcas1=rannumb(nrand) |
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| 105 | goto 101 |
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| 106 | end if |
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| 107 | wp=wp*timedir |
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| 108 | end if |
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| 109 | |
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| 110 | return |
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| 111 | end subroutine re_initialize_particle |
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