Engine Simulation: Help with Physics Models
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Hey everyone,
I am working on a simple simulation for a final project, and am a bit stumped with setting up my simulation. I am comparing the average density in two cylinders, one with a single intake valve, and one with two (to compare a 2-valve vs. 4-valve cylinder head). I am trying to make it as simple as possible, so there are no moving components etc. Nonetheless, I am rather stumped while trying to figure out an effective setup for my physics model. In terms of regions, there is only an inlet and walls, as I only want to measure density after a certain amount of time. It is a grossly simple simulation/ comparison, but will work for the project if I can get it to run properly. I have tried a stagnation inlet and a velocity inlet over a period of time and I am running into continuous problems. Residuals are all over the place and very high, and I have yet to see a density that looks reasonable. Currently I am using the following physics models: 3-D, steady, coupled, ideal gas, k-omega turbulence and cell quality remediation. I've attached a picture of the model I am using, if I am leaving out important info let me know, I'm just not sure where to look or what to change at this point so any advice would be appreciated. Thanks everyone. |
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I never did Engine Simulations, only external vehicle flow, but are you sure that the K-Omega is the adequate Turbulence model for internal combustion?
While I was searching for the turbulence model to use in my project I came across some references that would indicate that K-Epsilon and K-Omega SST is good for external flow, but for Internal Combustion you would need a more robust (and heavier) turbulence. I'm not saying it needs to be another one, but maybe you would like to do a search and find if that turbulence model will actually give you reasonable results in your problem type? Because the turbulence model is actually one of the most important settings in a CFD simulation! Also, what mesh are you using? in the inlet and outlet, you can use Trimmer as the flow should be pretty linear, but inside the combustion chamber i think you should use Polyhedral as its a highly turbulent environment! Also, your image is all black, so we can't really have a look what you shared or what does it look like your problem! |
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