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[LLhtc]

Yes, I am talking about the "flow-time" column (the 13th column , as reported in the user guide). Up to now, that is the test that I reported before, I was using the 2019R1 release. I have now used also the 2019R3 and 2021R1 releases: actually it seems to work, but it is skipping the first interval (from flow-time 0 to flow-time 5e-03[s]). Also, the injection time, that should be at flow-time= 3e-3[s] (and all the other time-steps according to the 5e-03s repetition interval, so 8e-03[s],13e-03[s],18e-03[s],etc.), sometime occurs in the next time-step:
[...
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 0
itertime/iter
Flow time = 0.001000000047497451s, time step = 1
19 more time steps
Updating solution at time level N...
done.
itertime/iter
Flow time = 0.002000000094994903s, time step = 2
18 more time steps
Updating solution at time level N...
done.
itertime/iter
Flow time = 0.003000000026077032s, time step = 3
17 more time steps
Updating solution at time level N...
done.
itertime/iter
Flow time = 0.004000000189989805s, time step = 4
16 more time steps
Updating solution at time level N...
done.
itertime/iter
Flow time = 0.005000000353902578s, time step = 5
15 more time steps
Updating solution at time level N...
done.
itertime/iter
Flow time = 0.006000000052154064s, time step = 6
14 more time steps
Updating solution at time level N...
done.
itertime/iter
Flow time = 0.007000000216066837s, time step = 7
13 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
Injecting 1 particle parcels with mass 1e-11 at t = 0.007
number tracked = 1
itertime/iter
Flow time = 0.00800000037997961s, time step = 8
12 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 1
itertime/iter
Flow time = 0.009000000543892384s, time step = 9
11 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 1
itertime/iter
Flow time = 0.01000000070780516s, time step = 10
10 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 1
itertime/iter
Flow time = 0.01100000087171793s, time step = 11
9 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 1
itertime/iter
Flow time = 0.01200000010430813s, time step = 12
8 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 1
itertime/iter
Flow time = 0.0130000002682209s, time step = 13
7 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
Injecting 1 particle parcels with mass 1e-11 at t = 0.013
number tracked = 2
itertime/iter
Flow time = 0.01400000043213367s, time step = 14
6 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 2
itertime/iter
Flow time = 0.01500000059604645s, time step = 15
5 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 2
itertime/iter
Flow time = 0.01600000075995922s, time step = 16
4 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 2
itertime/iter
Flow time = 0.01700000092387199s, time step = 17
3 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
Injecting 1 particle parcels with mass 1e-11 at t = 0.017
number tracked = 3
itertime/iter
Flow time = 0.01800000108778477s, time step = 18
2 more time steps
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 3
itertime/iter
Flow time = 0.01900000125169754s, time step = 19
1 more time step
Advancing DPM injections ....
Updating solution at time level N...
done.
number tracked = 3
itertime/iter
Flow time = 0.02000000141561031s, time step = 20
Calculation complete.
...]
Note1: when the original cas is read in the new releases, the time step is no more a round number, 1e-3s, but it gains that additional decimals....I am assuming that it does not affect the computation
Note 2: the injection file is now (just to be sure I am not messing up here somewhere):
(z=4 13)
(x y z u v w diameter t parcel-mass mass n-in-parcel time flow-time)
((0.0 0.00000000 5.5e-02 0.0 0.0 1 3.73e-05 400.0 1e-11 2.12406e-11 0.56349 0.0000e+00 3.0000e-03) injection-0:0)

Instead, I missed what you said about "You can use the option STart fol-time in File" to start injection after certain time elapsed: the last column in the injection file will then be used".
Do you mean the "Start flow-time in file [s]" options in the "point properties" dialog box? if I do not use this option "the last column in the injection file" is not used?
thanks for your help