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April 3, 2011, 13:17 
compressible solver for engine simulations

#1  
Senior Member
Join Date: Oct 2009
Posts: 136
Rep Power: 8 
Hello Foamers
I ve a problem with a compressible solver for mesh motion and topological changes. Basically, it is the dieselEngineFoam solver with some minor modifications. I would like to use with this solver the engineTopoChangerMesh classes. So far it runs, but only when i comment out the turbulent time scale, part for the combustion model. Since I do not have a lot of experiences with this kind of solver, i would appreciate if some of you could have a look on it. The spray seems to work. I can upload the solver if you are interested. I have a version for 1.5dev and 1.6ext. Quote:
Peter 

May 17, 2011, 05:40 

#2 
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Join Date: Nov 2010
Posts: 86
Rep Power: 6 
Hi Peter,
I got engine simulation working with turbulence model but using sonicTurbDyMEngineFoam, and the simpleEngineFvMesh class, I think u already have the example maybe it would be easier to adapt that software. I have a question for you, I also want to use the engineTopoChanger class, Im using verticalValves, but still don't know what the valveHeadPatch entry in engineGeometry stands for. What patch is it? I tried to set it to "none" or "empty", but what happens is that the cylinderHead part just above the valves moves down together with the valves!! :S Any ideas?? Would appreciate it 

May 17, 2011, 06:46 

#3 
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Posts: 136
Rep Power: 8 
Hi,
yes I got it Thx again a lot for it. I suppose the valveHeadPatch will be the upper part of your valve. Basically, you can split your valve in a bottom part, an upper part and the stem. Try to create different patches for your valve. I can imagine, since you don t specify any valveHeadpatch, the solver takes all upper cells as ValveHeadPatches and move them with the same speed as the valve. How many patches do you have for one valve? Best reagards Peter 

May 17, 2011, 07:09 

#4 
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Join Date: Nov 2010
Posts: 86
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No prob well the thing is that in engineGeometry it must also be specified a bottomPatch and poppetPatch for the valve, so I have this two patches for one valve, and I thought the poppetPatch was the top part of the valve, I'm quite confused now, so if I set the valveHeadPatch to the upper part of the valve, then what should the poppetPatch be?


May 19, 2011, 09:57 

#5 
New Member
Arun
Join Date: Mar 2009
Posts: 25
Rep Power: 8 
Hi,
Just wondering have you tried changing the kappa to be unity which increases the stability of the solution by assuming the reactor perfectly mixed (PSR)? I am not sure will this solve the problem or not but you can try. You can do this just by assigning the value as shown below: { //volScalarField tk = //Cmix*sqrt(turbulence>muEff()/rho/turbulence>epsilon()); //volScalarField tc = chemistry.tc(); //Chalmers PaSR model //kappa = (runTime.deltaT() + tc)/(runTime.deltaT() + tc + tk); kappa = 1.0; } Regards A 

May 20, 2011, 03:42 

#6 
Senior Member
Join Date: Oct 2009
Posts: 136
Rep Power: 8 
Hi arun,
thank you for the hint. I will try it. Regards peter 

June 9, 2011, 13:40 

#7  
Member
Walter Schostak
Join Date: May 2011
Posts: 35
Rep Power: 6 
Where can I find where
Quote:
Any help is much appreciated, Walter 

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