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February 26, 2013, 06:17 |
EGR mixing case
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#1 |
New Member
Join Date: Feb 2013
Posts: 10
Rep Power: 13 |
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 |
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February 26, 2013, 06:32 |
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#2 |
Senior Member
siamak rahimi ardkapan
Join Date: Jul 2010
Location: Copenhagen, Denmark
Posts: 220
Rep Power: 17 |
Have you tried to use pressure outlet for both inlet and outlet?
__________________
Good luck Siamak |
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February 26, 2013, 06:45 |
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#3 |
New Member
Join Date: Feb 2013
Posts: 10
Rep Power: 13 |
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
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February 14, 2014, 13:20 |
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#4 |
New Member
paul
Join Date: Dec 2011
Posts: 5
Rep Power: 14 |
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 |
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February 14, 2014, 16:03 |
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#5 |
Senior Member
Join Date: Nov 2010
Location: USA
Posts: 1,232
Rep Power: 24 |
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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