461 lines
13 KiB
Fortran
461 lines
13 KiB
Fortran
MODULE ysolve
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USE Compact
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IMPLICIT NONE
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PRIVATE
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REAL, PARAMETER :: pi=3.14159265358979323846
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REAL :: hx,dt,vis,sc,diff,pre,ac,bc,tf,t_now,t_uf,dt_uf
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REAL :: rvis,cstar,sigw
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REAL :: c_cut,c_ref,refwr,minf,tar_lo,u0,ctmp,l_0,lo_flm=0.
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REAL :: er_lof=0., erdot=0.,min_wr,prof_wr
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REAL :: pflame,pflold,oldu
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INTEGER :: ncyc=0,int_pr,nx
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REAL, DIMENSION(:,:), ALLOCATABLE :: u,y1,y2,yf
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REAL, DIMENSION(:), ALLOCATABLE :: uxt,duxt
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REAL, DIMENSION(:), ALLOCATABLE :: dm
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INTEGER :: istage
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REAL, DIMENSION(5) :: a=(/ 970286171893./4311952581923., &
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6584761158862./12103376702013., &
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2251764453980./15575788980749., &
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26877169314380./34165994151039., &
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0. /), &
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b=(/ 1153189308089./22510343858157., &
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1772645290293./4653164025191., &
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-1672844663538./4480602732383., &
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2114624349019./3568978502595., &
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5198255086312./14908931495163. /)
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LOGICAL :: read_itape, read_stdin
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CHARACTER(100) :: itape_name
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PUBLIC :: solve, parse
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CONTAINS
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!------------------------------------------------------------------------
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SUBROUTINE parse
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CHARACTER(100) :: num1char
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!First, make sure the right number of inputs have been provided
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IF(COMMAND_ARGUMENT_COUNT().EQ.0)THEN
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! read from itape
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read_itape = .true.
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ELSE IF(COMMAND_ARGUMENT_COUNT().EQ.1)THEN
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CALL GET_COMMAND_ARGUMENT(1,num1char) !first, read in the two values
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ELSE
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WRITE(*,*)'ERROR, TOO MANY COMMAND-LINE ARGUMENTS(MORE THAN ONE). STOPPING'
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STOP
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ENDIF
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read_stdin = (num1char=="-")
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IF(read_itape)THEN
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itape_name = "itape"
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WRITE(*,*) "Read from itape"
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ELSE IF(read_stdin)THEN
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WRITE(*,*) "Read from STDIN"
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ELSE
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itape_name = num1char
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WRITE(*,*) "Read from " // num1char
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END IF
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END SUBROUTINE parse
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!------------------------------------------------------------------------
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SUBROUTINE solve
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INTEGER :: i,j,k,savenum
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REAL :: pflame,pflold,delf=0.
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CALL READ_INTRO
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CALL ludcmp(nx,5,5,1,0,0)
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CALL SET_IC
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t_now=0.; t_uf=0.
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DO
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CALL SET_BC
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CALL RK4
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IF(t_now.ge.tf) EXIT
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IF(t_uf.ge.dt_uf) THEN
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pflold=pflame
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pflame=0.
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DO i=1,nx
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pflame=pflame+y1(i,1)*hx
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uxt(i)=y1(i,1)
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ENDDO
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CALL dfnonp(nx,hx,uxt,duxt,1,1)
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delf=1./MAXVAL(ABS(duxt))
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oldu=u(1,1)
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u=u+0.5*(hx*REAL(nx)*tar_lo-pflame)+0.5*(pflold-pflame)
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t_uf=0.
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WRITE(*,'(a3,f8.3,a10,f6.3,a10,f6.3,a10,f7.4,a10,f7.4,a8,f7.4)') &
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' T:',t_now,' // Tar_L:',l_0*tar_lo,' // cur_L:',pflame/hx/REAL(nx)*l_0, &
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' // Old_U:',oldu,' // New_U:',u(1,1),' // L_f:',delf
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! WRITE(*,'(a7,f7.4,a7,f7.4,a10,f7.4)') ' cur_U:',oldu,' // dU:',u(1,1,1)-oldu,' // new_U:',u(1,1,1)
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! WRITE(*,*)
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ENDIF
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ncyc=ncyc+1
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t_uf=t_uf+dt
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t_now=t_now+dt
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IF (MOD(ncyc,int_pr).eq.0) THEN
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! WRITE(*,'(a2,f8.3,a9,f10.7,a11,i6,a7,f9.5)') &
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! 'T:',t_now,' // dT:',dt,' // NCYC:',ncyc,' // U:',u(1,1,1)
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ENDIF
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ENDDO
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CALL write_sd
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CALL write_pre
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CALL save_final_field
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WRITE(*,*)
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WRITE(*,*) 'Fin.'
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WRITE(*,*)
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END SUBROUTINE solve
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SUBROUTINE write_sd
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REAL :: c,yr,wrate,dely,sdr,sdd,sd,uu,onelw,dd
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INTEGER :: i,j,k,nd
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REAL, DIMENSION(1,nx) :: ux,dux,d2ux
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REAL, DIMENSION(10,nx) :: sav
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sav=0.
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! refwr=pre*1.*exp(-ac/(1.+bc*c_cut))
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! minf=exp((c_ref-c_cut)*prof_wr)
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refwr=pre*1.*exp(-ac/(1.+bc*c_ref))
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WRITE(500,*) 'VARIABLES = "X","Yr","C","U","Wrate","|DEL(Y)|","Sdr"'
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WRITE(500,*) ' "Sdd","Sd","(1/C)/(dC/dx)","DIV(rho*Dmu*Gra(C))"'
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DO i=1,nx
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ux(1,i)=y1(i,1) ! Yr
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IF (ux(1,i).gt.1.) ux(1,i)=1.
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ENDDO
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nd=1
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CALL dfnonp(nx,hx,ux(1,:),dux(1,:),nd,1)
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nd=1
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CALL d2fnonp(nx,hx,ux(1,:),d2ux(1,:),nd,1)
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DO i=1,nx
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yr=ux(1,i)
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c=1.-yr
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IF (c.lt.0.) c=0.
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wrate=pre*yr*exp(-ac/(1.+bc*(1.-yr))) !wrate
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! IF (c.le.c_cut) THEN
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! wrate=min_wr
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! IF (c.gt.c_ref) wrate= &
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! ((exp((c-c_cut)*prof_wr)-minf)/(1.-minf)*(refwr-min_wr))+min_wr
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! ENDIF
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IF (c.le.c_ref) THEN
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wrate=min_wr
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IF (c.gt.c_cut) wrate=((refwr-min_wr)*exp(prof_wr*(c-c_ref))+ &
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min_wr-refwr*exp(prof_wr*(c_cut-c_ref)))/(1.-exp(prof_wr*(c_cut-c_ref)))
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ENDIF
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dely=ABS(dux(1,i))
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sdr=wrate/dely
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sdd=-dm(i)*d2ux(1,i)/dely
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IF (dely.eq.0.) THEN
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sdr=0.; sdd=0.
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ENDIF
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sd=sdr+sdd
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uu=u(1,1)
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onelw=(-dux(1,i))/c
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dd=-dm(i)*d2ux(1,i)
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if (c.eq.0.) onelw=0.
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sav(1,i)=sav(1,i)+yr
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sav(2,i)=sav(2,i)+c
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sav(3,i)=sav(3,i)+uu
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sav(4,i)=sav(4,i)+wrate
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sav(5,i)=sav(5,i)+dely
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sav(6,i)=sav(6,i)+sdr
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sav(7,i)=sav(7,i)+sdd
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sav(8,i)=sav(8,i)+sd
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sav(9,i)=sav(9,i)+onelw
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sav(10,i)=sav(10,i)+dd
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ENDDO
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DO i=1,nx
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WRITE(500,'(37e30.20)') (i-1)*hx,sav(1:10,i)
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ENDDO
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END SUBROUTINE write_sd
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SUBROUTINE save_final_field
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INTEGER :: i,j,k
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OPEN (305,FILE='sfield.bin',form='unformatted',status='unknown')
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DO i=1,nx
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WRITE (305) y1(i,1)
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ENDDO
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CLOSE (305)
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OPEN (305,FILE='sfield.dat')
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DO i=1,nx
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WRITE (305,'(e30.20)') y1(i,1)
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ENDDO
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CLOSE (305)
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END SUBROUTINE save_final_field
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SUBROUTINE write_pre
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REAL :: yr,c,dy,maxdy=0.,del_f
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REAL :: S_L=0.,wrate
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INTEGER :: i
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REAL, DIMENSION(1,nx) :: ux, dux
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DO i=1,nx
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yr=y1(i,1)
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c=1.-yr
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ux(1,i)=yr
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wrate=pre*yr*exp(-ac/(1.+bc*(1.-yr))) !wrate
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! IF (c.le.c_cut) THEN
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! wrate=min_wr
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! IF (c.gt.c_ref) wrate= &
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! ((exp((c-c_cut)*prof_wr)-minf)/(1.-minf)*(refwr-min_wr))+min_wr
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! ENDIF
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IF (c.le.c_ref) THEN
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wrate=min_wr
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IF (c.gt.c_cut) wrate=((refwr-min_wr)*exp(prof_wr*(c-c_ref))+ &
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min_wr-refwr*exp(prof_wr*(c_cut-c_ref)))/(1.-exp(prof_wr*(c_cut-c_ref)))
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ENDIF
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S_L=S_L+wrate*hx
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ENDDO
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WRITE(*,'(a31,e14.8)') ' INTEGRAL( Wrate x dx ) => Sc :',S_L
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CALL dfnonp(nx,hx,ux(1,:),dux(1,:),1,1)
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DO i=(nx/10),nx-(nx/10)
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dy=dux(1,i)
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maxdy=MAX(ABS(dy),maxdy)
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ENDDO
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del_f=1./maxdy
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WRITE(*,'(a13,e14.8,a25,e14.8)') ' Grid size : ',hx,' / Laminar flame speed : ',u(1,1)
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WRITE(*,'(a19,e14.8,a3,f9.5,a20)') &
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' Flame thickness : ',del_f,' / ',del_f/hx,' grids in the flame.'
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WRITE(*,*)
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END SUBROUTINE write_pre
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SUBROUTINE SET_BC
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y1(1,1)=1.-ctmp
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END SUBROUTINE SET_BC
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SUBROUTINE SET_IC
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INTEGER :: i, ifl, si
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REAL :: xi
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ifl=INT(2.0*pi*0.1/hx)
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u=u0; si=INT(nx*(1.-tar_lo))
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DO i=1,nx
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IF(i< nx-(si+ifl/2)) THEN
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xi=0.+ctmp
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ELSE IF(i> nx-(si-ifl/2)) THEN
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xi=1.
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ELSE
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xi=0.5+REAL(i-nx+si)/REAL(ifl)
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ENDIF
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! y1(i,1,1)=(1.-xi)*1.
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y1(i,1)=(1.-xi) ! reactant mass fraction
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ENDDO
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y1(:,2) = 1.0 - y1(:,1)
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pflame=0.
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DO i=1,nx
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pflame=pflame+y1(i,1)*hx
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ENDDO
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END SUBROUTINE SET_IC
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SUBROUTINE READ_INTRO
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CHARACTER(LEN=8) :: cdum
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INTEGER :: itape=300,otape=301,ierr
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INTEGER :: i
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IF (read_stdin) THEN
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itape=5
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ELSE
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OPEN(itape,FILE=itape_name)
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END IF
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OPEN(otape,FILE='otape')
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READ(itape,*) cdum,nx
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WRITE(otape,*) cdum,nx
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READ(itape,*) cdum,l_0
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WRITE(otape,*) cdum,l_0
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READ(itape,*) cdum,int_pr
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WRITE(otape,*) cdum,int_pr
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READ(itape,*) cdum,tar_lo
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WRITE(otape,*) cdum,tar_lo
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READ(itape,*) cdum,dt
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WRITE(otape,*) cdum,dt
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READ(itape,*) cdum,sc
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WRITE(otape,*) cdum,sc
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READ(itape,*) cdum,vis
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WRITE(otape,*) cdum,vis
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READ(itape,*) cdum,pre
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WRITE(otape,*) cdum,pre
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READ(itape,*) cdum,ac
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WRITE(otape,*) cdum,ac
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READ(itape,*) cdum,bc
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WRITE(otape,*) cdum,bc
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READ(itape,*) cdum,u0
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WRITE(otape,*) cdum,u0
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READ(itape,*) cdum,tf
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WRITE(otape,*) cdum,tf
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READ(itape,*) cdum,dt_uf
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WRITE(otape,*) cdum,dt_uf
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READ(itape,*) cdum,ctmp
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WRITE(otape,*) cdum,ctmp
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READ(itape,*) cdum,c_cut
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WRITE(otape,*) cdum,c_cut
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! READ(itape,*) cdum,cs
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! WRITE(otape,*) cdum,cs
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READ(itape,*) cdum,c_ref
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WRITE(otape,*) cdum,c_ref
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READ(itape,*) cdum,min_wr
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WRITE(otape,*) cdum,min_wr
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READ(itape,*) cdum,prof_wr
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WRITE(otape,*) cdum,prof_wr
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READ(itape,*) cdum,rvis
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WRITE(otape,*) cdum,rvis
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READ(itape,*) cdum,cstar
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WRITE(otape,*) cdum,cstar
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READ(itape,*) cdum,sigw
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WRITE(otape,*) cdum,sigw
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DO i = 0,100
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WRITE(*,*) diffusivity_T076(i / 100.)
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END DO
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IF (.not.read_stdin) THEN
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CLOSE(itape)
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END IF
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! hx=l_0*pi/REAL(nx)
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hx=l_0*pi/REAL(nx-1)
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cdum='hx'
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WRITE(otape,*) cdum,hx
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cdum='Ta/Tu'
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WRITE(otape,*) cdum,ac
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cdum='Tb/Tu'
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WRITE(otape,*) cdum,bc+1
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diff=vis/sc
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cdum='diff'
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WRITE(otape,*) cdum,diff
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! refwr=pre*1.*exp(-ac/(1.+bc*c_cut))
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! minf=exp((c_ref-c_cut)*prof_wr)
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refwr=pre*1.*exp(-ac/(1.+bc*c_ref))
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l_0=l_0*pi
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ALLOCATE( u(nx,1),STAT=ierr) ; u=0.
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ALLOCATE(y1(nx,2),STAT=ierr) ; y1=0.
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ALLOCATE(y2(nx,2),STAT=ierr) ; y2=0.
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ALLOCATE(yf(nx,2),STAT=ierr) ; yf=0.
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ALLOCATE(uxt(nx),STAT=ierr) ; uxt=0.
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ALLOCATE(duxt(nx),STAT=ierr) ; duxt=0.
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ALLOCATE(dm(nx),STAT=ierr) ; dm=diff
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END SUBROUTINE READ_INTRO
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SUBROUTINE RK4
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istage=1; CALL substep(y1,y1,y2,yf)
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istage=2; CALL substep(y1,y2,y1,yf)
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istage=3; CALL substep(y2,y1,y2,yf)
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istage=4; CALL substep(y1,y2,y1,yf)
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istage=5; CALL substep(y2,y1,y2,yf)
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END SUBROUTINE RK4
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!------------------------------------------------------------------------
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SUBROUTINE substep(ri,r1,r2,f)
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REAL, INTENT(INOUT),DIMENSION(:,:) :: ri,r1,r2
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REAL, INTENT(OUT),DIMENSION(:,:) :: f
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INTEGER :: i,j,k
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REAL :: at,bt
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CALL fns(ri,f)
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IF(istage<5) THEN
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at=a(istage)*dt
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bt=(b(istage)-a(istage))*dt
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r1=r1+at*f
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r2=r1+bt*f
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ELSE
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bt=b(istage)*dt
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r1=r1+bt*f
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ENDIF
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END SUBROUTINE substep
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!------------------------------------------------------------------------
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SUBROUTINE fns(r1,f)
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REAL, INTENT(IN),DIMENSION(:,:) :: r1
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REAL, INTENT(OUT),DIMENSION(:,:) :: f
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REAL, DIMENSION(2,nx) :: ux, dux, d2ux
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INTEGER :: i,j,k
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REAL :: wrate,Ly,Dy
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! x-direction
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DO i=1,nx
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ux(1,i)=r1(i,1) ! Y
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ux(2,i)=r1(i,2) ! T
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ENDDO
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CALL dfnonp(nx,hx,ux(:,:),dux(:,:),2,1)
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CALL d2fnonp(nx,hx,ux(:,:),d2ux(:,:),2,1)
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DO i=1,nx
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wrate=pre*ux(1,i)*exp(-ac/(1.+bc*(1.-ux(1,i)))) !wrate
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IF ((1.-ux(1,i)).le.c_ref) THEN
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wrate=min_wr
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IF ((1.-ux(1,i)).gt.c_cut) wrate=((refwr-min_wr)*exp(prof_wr*(1.-ux(1,i)-c_ref))+ &
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min_wr-refwr*exp(prof_wr*(c_cut-c_ref)))/(1.-exp(prof_wr*(c_cut-c_ref)))
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ENDIF
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! -0.5*( d(u*Y)/dx + u*dY/dx + Y*du/dx ) + D*d2Y/d2x
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f(i,1) = - ( u(i,1)*dux(1,i) ) + diff * d2ux(1,i) - wrate
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IF (i.eq.nx) THEN
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Ly=u(nx,1)*dux(1,nx) ! Ly = u*dYr/dx
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f(nx,1)=-wrate
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ENDIF
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ENDDO
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! Boundary conditionS
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f(1,1)=0.
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Dy=Ly
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f(nx,1)=f(nx,1)-Dy
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END SUBROUTINE fns
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!------------------------------------------------------------------------
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REAL FUNCTION sigmoid(x)
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REAL, INTENT(IN) :: x
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sigmoid = 1. / (1 + exp(-x))
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END FUNCTION sigmoid
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!------------------------------------------------------------------------
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REAL FUNCTION diffusivity_sigmoid(c)
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REAL, INTENT(IN) :: c
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diffusivity_sigmoid = 1. + (rvis - 1.) * sigmoid(sigw*(c-cstar))
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END FUNCTION diffusivity_sigmoid
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!------------------------------------------------------------------------
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REAL FUNCTION diffusivity_T076(c)
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REAL, INTENT(IN) :: c
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diffusivity_T076 = ((1.0 + bc * c) ** 0.76)
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END FUNCTION diffusivity_T076
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!------------------------------------------------------------------------
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END MODULE ysolve
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