Thermal expansion coefficient

Hello

How can I define the thermal expansion coefficient for natural convection problem?

Hi Samah. I’m fairly certain that none of the MFiX models handle thermal expansion. Can you tell us a bit more about what you are trying to do?

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I am trying to simulate the natural convection in a partially heated rectangular enclosure, I need to add the body force term in y-momentum equation highlighted in the red box.
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Looks like a duplicate of Define body force term in y-momentum equation

Please see my answer at the bottom of this post.

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Dear Jeff,

Thank you so much for your response. I believe I phrased the question in the improper way. I posted my question another way.

I am sorry for asking a lot. I am a beginner and a little bit confused and facing difficulty deciding how to proceed.