dieselEngineFoam: no compression

yvyan · November 20, 2011, 09:39

Hello everybody,

this is my first post then, sorry if I wrong something!!!

I have the following problem:
I am trying to simulate a diesel engine sector (51°) with the solver dieselEngineFoam and solving the chemical properties with Chemkin.
I have generated three wall boundaries: (piston, liner and cylinderHead) and a cyclic boundary to define the sector.
My simulation start for now from Bottom Death Center (BDC) (I will change the start of simulation to Intake Valve Closing (IVC) later) I have setted-up the simulation but when I run it the pressure doesn't rise (just few pascal):
p@-180 = 100000 Pa (BDC)
p@0 = 101000 Pa (TDC)

then the combustion does not begin.
Have you got any idea on what could be the error?

kalle · November 21, 2011, 02:35

Did you set U to be movingWall at the piston patch?

yvyan · November 21, 2011, 18:05

Quote:

Originally Posted by kalle

Did you set U to be movingWall at the piston patch?

Emmm.... NO!

I forgot it! Thank you. I have controlled the initial condition at least 1000 times without to find the error!
Now it seems to work.
Thank you again.
All the best,

Giuseppe.

November 20, 2011, 09:39	dieselEngineFoam: no compression	#1
yvyan New Member virelli giuseppe Join Date: Nov 2011 Posts: 14 Rep Power: 15	Hello everybody, this is my first post then, sorry if I wrong something!!! I have the following problem: I am trying to simulate a diesel engine sector (51°) with the solver dieselEngineFoam and solving the chemical properties with Chemkin. I have generated three wall boundaries: (piston, liner and cylinderHead) and a cyclic boundary to define the sector. My simulation start for now from Bottom Death Center (BDC) (I will change the start of simulation to Intake Valve Closing (IVC) later) I have setted-up the simulation but when I run it the pressure doesn't rise (just few pascal): p@-180 = 100000 Pa (BDC) p@0 = 101000 Pa (TDC) then the combustion does not begin. Have you got any idea on what could be the error?

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November 21, 2011, 02:35		#2
kalle Senior Member Karl-Johan Nogenmyr Join Date: Mar 2009 Location: Linköping Posts: 279 Rep Power: 21	Did you set U to be movingWall at the piston patch?