ansys 做温度场瞬态热分析遇到以下问题

1.加载时能看到扫描热源一点一点移动，但是求解时不能看到，求解总是在第一步中断，提示说：solution not converged at time 1.25e-3（load step 1 substep1）Run terminated 什么原因呢？
2.下面这个可以运行成功的移动热源小例子中，后面j具体指什么呢？
/TITLE,3D moving heat
/PREP7
ET,1,SOLID70
KEYOPT,1,2,0
KEYOPT,1,4,0
KEYOPT,1,7,0
KEYOPT,1,8,0
!*
MPTEMP,1,0
MPDATA,KXX,1,,0.07
MPTEMP,1,0
MPDATA,C,1,,448
MPTEMP,1,0
MPDATA,DENS,1,,7.8e-6
BLOCK,0,50,0,3,0,500,
/VIEW, 1 ,1,1,1
/ANG, 1
/REP,FAST
lesize,all,2
vmesh,all
/psf,hflu,,2,0
/PNUM,LINE,1
sfa,1,,conv,50e-6,25,
sfa,2,,conv,50e-6,25,
sfa,5,,conv,50e-6,25,
sfa,6,,conv,50e-6,25,
finish
/solu
antype,trans
trnopt,full
nropt,auto,,
eqslv,
solcontrol,on
autots,on
kbc,1
outres,all,all,
!load step 1, initial conditions 25 c
time,0.001
deltim,0.001,0.001,0.001
timint,off
tunif,25,
solve
timint,on
j=1 ！问题 J=1
allsel,all
*do,i,10,50,2
time,j !问题TIME , J
deltim,0.001,0.001,0.001,
sfdele,all,hflux
nsel,s,loc,x,22,28
nsel,r,loc,y,3
nsel,r,loc,z,i,i+6
sf,all,hflux,100
ALLSEL,ALL
nsel,s,loc,x,23,27
nsel,r,loc,y,3
nsel,r,loc,z,i+1,i+5
sf,all,hflux,200
ALLSEL,ALL
nsel,s,loc,x,24,26
nsel,r,loc,y,3
nsel,r,loc,z,i+2,i+4
sf,all,hflux,400
ALLSEL,ALL
nsubst,1
outres,all,all
allsel,all
solve
j=j+0.24 !问题 J=J+0.24
*enddo
弄不清这几个 J 是什么意思，其他都懂
请指点下