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Problem with UDS in two stroke combustion engine with valve motion

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Old   July 10, 2020, 04:18
Question Problem with UDS in two stroke combustion engine with valve motion
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Hubert
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Dear friends,

I am trying to simulate work cycle of a two stroke piston engine, with unusual for them valve placing. I was doing something similar to this for my bachelors engineering thesis, so the basics in Fluent are clear for me, but I have some weird problem.

I have to analyse the charge exchange, so the UDS is very important for me, but unfotunately it's not working how it is "supposed" to. What I mean by this, is the fact that after start of valve motion it is still in "0 to 1" borders, but after some more time steps it starts to rise to enormous values, and Fluent cannot work with that, and gives me back error: "Floating point exception". You can see how it looks like on simulation by clicking the links below (my Google drive):

1) Mesh: https://drive.google.com/file/d/1j2Y...ew?usp=sharing
2) UDS: https://drive.google.com/file/d/1Q9x...ew?usp=sharing

Could anyone help me with this error? Maybe someone had the same problem? I will be very grateful
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charge exchange, two-stroke engine, uds, valve

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