[usamaubk]

I am constantly getting this printed in Converge status. I am running CI engine simulation with blended fuel. This is being repeated for almost all the main injection events and after.

[ 57.81%] ncyc 40962; Crank 364.341 (deg); dt= 1.250000000e-08 (dt_grow)
recovering .... because dt_chem too large: t_chem= 5.135885e-01 dt= 1.250000e-08 mult_dt_chem= 5.000000e-01 dt_chem= 2.846167e-09
[ 57.81%] ncyc 40963; Crank 364.341 (deg); dt= 1.250000000e-08 (dt_grow)
recovering .... because dt_chem too large: t_chem= 5.125824e-01 dt= 1.250000e-08 mult_dt_chem= 5.000000e-01 dt_chem= 2.890790e-09
[ 57.81%] ncyc 40964; Crank 364.341 (deg); dt= 1.250000000e-08 (dt_grow)
recovering .... because dt_chem too large: t_chem= 5.115406e-01 dt= 1.250000e-08 mult_dt_chem= 5.000000e-01 dt_chem= 2.938424e-09
[ 57.81%] ncyc 40965; Crank 364.341 (deg); dt= 1.250000000e-08 (dt_grow)
recovering .... because dt_chem too large: t_chem= 5.049359e-01 dt= 1.250000e-08 mult_dt_chem= 5.000000e-01 dt_chem= 2.946903e-09
[ 57.81%] ncyc 40966; Crank 364.341 (deg); dt= 1.250000000e-08 (dt_grow)
recovering .... because dt_chem too large: t_chem= 5.039253e-01 dt= 1.250000e-08 mult_dt_chem= 5.000000e-01 dt_chem= 2.999713e-09

This has caused the simulation too slow down a lot. By slowing down i mean in order of weeks. The simulation is stuck (progressing very slow) when the injection is happening. I decreased the mult_dt_chem from 0.5(default) to 0.1. but still no effect on speed (it is still being printed). The time step settings are default with min. time step of 1e-8 ( at some CAD this minimum time step is also forced as dt=dtmin forced by recover_chem). Any idea how to speed up the simulation? and get rid of this?My case setup is fine and I used the same for pure diesel. I am injecting 70000 parcels/nozzle with min cell size of 0.25 at nozzle having total mass of around 40mg. It would be appreciated. Thanks