!********************************************************************** ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * ! * ! This file is part of FLEXPART. * ! * ! FLEXPART is free software: you can redistribute it and/or modify * ! it under the terms of the GNU General Public License as published by* ! the Free Software Foundation, either version 3 of the License, or * ! (at your option) any later version. * ! * ! FLEXPART is distributed in the hope that it will be useful, * ! but WITHOUT ANY WARRANTY; without even the implied warranty of * ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * ! GNU General Public License for more details. * ! * ! You should have received a copy of the GNU General Public License * ! along with FLEXPART. If not, see . * !********************************************************************** subroutine re_initialize_particle(zp,ust,wst,h,sigmaw,wp,nrand,ol) ! i i i i i io io i !=============== CBL skewed vertical profiles and formulation of LHH 1996 with profile of w3 from lHB 2000 ====== !=============== LHH formulation has been modified to account for variable density profiles and backward in time or forward in time simulations ====== !=============== this routine re-initiaalize particle velocity if a numerical instability in the cbl scheme generated a NaN value ====== !=============== the particle velocity is extracted from the updraft and downdraft distribution as required ====== !=============== the re-initialization si not perfect see e.g. Cassiani et al(2015) BLM ====== !====================================================================================================================================================== !====================================================================================================================================================== use par_mod, only:pi use com_mod, only:ldirect,rannumb implicit none real :: usurad2,usurad2p,C0,costluar4,eps parameter (usurad2=0.7071067812,usurad2p=0.3989422804,C0=2,costluar4=0.66667,eps=0.000001) integer idum,nrand real :: wp,zp,ust,wst,h,dens,ddens,sigmaw,dsigmawdz,tlw,dcas,dcas1 !,ran3,gasdev real :: w3,w2 real :: z, & skew, & skew2, & radw2, & fluarw,fluarw2, & rluarw, & xluarw, & aluarw, & bluarw, & sigmawa, & sigmawb, & ath, & bth, & wb,wa real timedir real ol,transition !--------------------------------------------------------------------------- !timedir direction of time forward (1) or backward(-1) nrand=nrand+1 dcas1=rannumb(nrand) timedir=ldirect z=zp/h transition=1. if (-h/ol.lt.15) transition=((sin((((-h/ol)+10.)/10.)*pi)))/2.+0.5 w2=sigmaw*sigmaw w3=(((1.2*z*((1.-z)**(3./2.)))+eps)*wst**3)*transition skew=w3/(w2**1.5) skew2=skew*skew radw2=sqrt(w2) !sigmaw fluarw=costluar4*skew**0.333333333333333 fluarw2=fluarw*fluarw rluarw=(1.+fluarw2)**3.*skew2/((3.+fluarw2)**2.*fluarw2) !-> r xluarw=rluarw**0.5 !(1.+fluarw2)**1.5*skew/((3.+fluarw2)*fluarw) !----> r^1/2 aluarw=0.5*(1.-xluarw/(4.+rluarw)**0.5) bluarw=1.-aluarw sigmawa=radw2*(bluarw/(aluarw*(1.+fluarw2)))**0.5 sigmawb=radw2*(aluarw/(bluarw*(1.+fluarw2)))**0.5 wa=(fluarw*sigmawa) wb=(fluarw*sigmawb) if ((sign(1.,wp)*timedir).gt.0) then !updraft 100 wp=(dcas1*sigmawa+wa) if (wp.lt.0) then nrand=nrand+1 dcas1=rannumb(nrand) goto 100 end if wp=wp*timedir else if ((sign(1.,wp)*timedir).lt.0) then !downdraft 101 wp=(dcas1*sigmawb-wb) if (wp.gt.0) then nrand=nrand+1 dcas1=rannumb(nrand) goto 101 end if wp=wp*timedir end if return end subroutine re_initialize_particle