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What to do with upper fluid surface of fluid in open microchannel heat sink?

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Old   January 9, 2024, 09:29
Default What to do with upper fluid surface of fluid in open microchannel heat sink?
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Greetings,
So I was working on validating a paper with an open microchannel heatsink configuration. Now I was successfully able to make the model and prepare the mesh etc and imported it to FLUENT. The model is given here.
Screenshot (106).png

Now in this model, the upper part of the channel is kept empty and the entire area will be filled with fluid as per figure. Screenshot (107).png
Inlet has velocity assigned to it. My question is, will the upper wall of the fluid be considered a moving wall with the same velocity as inlet?

Screenshot (108).png
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