# EGR mixing case

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 February 26, 2013, 07:17 EGR mixing case #1 New Member   Join Date: Feb 2013 Posts: 9 Rep Power: 4 Hiii.. In this case i am simulating air and EGR mixing in this nozzle. i am not willing to give mass flow inlet for EGR (although i have mass flow rates for EGR1 and EGR2 inlets). I want to drive the EGR due to pressure difference in this convergent divergent nozzle. I have attached the BC's i want to simulate. Would like you to help me with the what exact BC's to be used. If i give mass flow then pressure dsnt matches and vice versa.I have used the following BC's but of no use a) Inlet - Mass flow , EGR's inlet - stagnation inlet, Outlet - Pressure outlet b) Inlet - Stagnation inlet, EGR's inlet - Pressure outlet ( with target mass flow) , Outlet - pressure outlet Physics i have used are as follows: Ideal gas, K-e turbulence, passive scalars, segregated temp, segregated energy, all y+ etc Help me out with this Regards RD egr case1.JPG

 February 26, 2013, 07:32 #2 Senior Member     siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 218 Rep Power: 9 Have you tried to use pressure outlet for both inlet and outlet? __________________ Good luck Siamak

 February 26, 2013, 07:45 #3 New Member   Join Date: Feb 2013 Posts: 9 Rep Power: 4 yes i have done that too...i have mentioned the specified pressure given in the attachmnt for EGR inlet also along with this i have tried the target mass flow rate but of no use...m not getting the results as such

 February 14, 2014, 14:20 #4 New Member   paul Join Date: Dec 2011 Posts: 1 Rep Power: 0 Hi, I have the same problem, I need to set pressure + masss flow inlet and pressure outlet. I try: 1) Inlet - Stagnation pressure (16 atm) Outlet - mass flow rate I get solution, where i have the same total pressure on the whole computational domain, it's wrong result 2) Inltet - Pressure outlet (16 atm) Outlet - Pressure outlet (0 atm) with target mass flow rate I get solution with wrong mass flow rate Help me please with advise Regards Paul

 February 14, 2014, 17:03 #5 Senior Member   Join Date: Nov 2010 Posts: 418 Rep Power: 8 IMO the target mass flow option is not very good in STAR-CCM+, you can get better results by coding in the BC using Newton's method in Java.

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