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IC engine valve dynamic mesh modelling

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Old   April 14, 2018, 10:27
Default IC engine valve dynamic mesh modelling
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Hello. I have a problem regarding valve modelling in ANSYS FLUENT for IC engine sim. I figured modeling the valve is the most difficult part so I just gonna concentrate on the valve aspect first.

ic engine valve.jpg

As seen in the top picture (initial state), i would like to extend the valve
to the middle of the domain as simulation progresses (middle picture). Its kindda like a wall is being extruded to extend the valve stem.

I have separated the valve into 2 (valve stem and valve head) and assign dynamic mesh to stem and valve head as rigid to move to the right. The domain meanwhile is set as deforming.

However as calculation progresses, the stem was disconnected from inlet (bottom picture) and calculation stops due to negative volume.

Anybody has any idea how to "extrude" the valve stem as it moves?
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