Use OpenFOAM to simulate Knocking combustion in IC engine

fcl · March 2, 2018, 04:55

Hello all，
I'm trying to use engineFoam to simulate knock combustion. I have learnt that it use XiFoam to simulate combustion progress, but it seems not able to simulate end mixture auto-ignition. Could any one tell me whether there is a way to simulate knock combustion by engineFoam?
Thanks very much!

kalle · March 5, 2018, 04:19

Hi!

Engine knocking involves some very complicated chemistry with hundreds (perhaps thousands) of species interacting. This even for surrogate fuels. Simulating it means this has to be respected, something which is way beyond the capability of combustion models like XiFoam.

A straight forward method would be to include all these species and a mechanism, perhaps heavily reduced. You could look at sprayEngineFoam, but remove the lagrangian spray part. This will require massive computational power and is probably still out of reach.

A lot cheaper way could be to transport a fictive "ignition specie" with a source term coming from tabulated ignition delays using a detailed surrogate fuel mechanism. Look into the details of the ECFM-3Z or ECFM model how they do it (Colin et al). Prepare for digging into the OpenFOAM code and doing substantial programming to achieve this.

K

fcl · March 6, 2018, 05:02

Thank you kalle, I'll learn about what you said.

March 2, 2018, 04:55	Use OpenFOAM to simulate Knocking combustion in IC engine	#1
fcl New Member Join Date: Oct 2017 Posts: 14 Rep Power: 9	Hello all， I'm trying to use engineFoam to simulate knock combustion. I have learnt that it use XiFoam to simulate combustion progress, but it seems not able to simulate end mixture auto-ignition. Could any one tell me whether there is a way to simulate knock combustion by engineFoam? Thanks very much!

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March 5, 2018, 04:19		#2
kalle Senior Member Karl-Johan Nogenmyr Join Date: Mar 2009 Location: Linköping Posts: 279 Rep Power: 21	Hi! Engine knocking involves some very complicated chemistry with hundreds (perhaps thousands) of species interacting. This even for surrogate fuels. Simulating it means this has to be respected, something which is way beyond the capability of combustion models like XiFoam. A straight forward method would be to include all these species and a mechanism, perhaps heavily reduced. You could look at sprayEngineFoam, but remove the lagrangian spray part. This will require massive computational power and is probably still out of reach. A lot cheaper way could be to transport a fictive "ignition specie" with a source term coming from tabulated ignition delays using a detailed surrogate fuel mechanism. Look into the details of the ECFM-3Z or ECFM model how they do it (Colin et al). Prepare for digging into the OpenFOAM code and doing substantial programming to achieve this. K

March 6, 2018, 05:02		#3
fcl New Member Join Date: Oct 2017 Posts: 14 Rep Power: 9	Thank you kalle, I'll learn about what you said.