[kinni]

Dear all!
I am very new to fluent & Ansys too
I am modelling a component of diesel engine exhaust system(diesel particulate filter) with some gas compositions along with particulates.
in my case i have plenty of channels(nearly 4000). the material is porous(cordierite or SiC). my BC's are MFR:38kg/sec, P(in):108054pa, P(out):atm or 104023.
i have decided to simulate a small sector of whole component and considering 9 channels flow for my reference.
i am considering DPM modelling for injections of particulates & species transport to define exhaust gas compositions in mass fractions.
MY QuEsTion is???
**am i going in right way?(all are frozens; 10 bodies as one part)
**How can i reduce that BC to small domain which i considered(for 9 channels)?

why i am asking because, when i reduced MFR to small geometry ie., 0.038/530(say 530th part)=7.2e-5. the pressur contours are very high upto e+13 and velocity also high as e-08 which are undesirable.
I need pressure contours in the range of e+5. i have attached some snaps for reference.
Please help me out, it helps me lot to go further.
Any suggestions are appreciable..
Many thanks in advance