Learning Forum

[mercypham]

Dear all,

I am performing fluent with VOF to simulate the heat transfer. However, after heating, the material cool down till the liquidus temperature and keep remained at the temperature. It did not cool down to room temperature even I set the long time for cooling. Do anyone have idea to solve this problem?

Thank you so much

[Rob]

What boundary conditions have you got set?

[mercypham]

Thank you for your reply,

I have set convection and radiation for boundary condition.

[Rob]

Check what values you put on those. 

[mercypham]

I use the value from a journal paper, with heat transfer coefficient of 100 and the emission of 0.4

[Rob]

And the free stream convection and radiation temperature?

[mercypham]

I set 300K for that. 

[Rob]

And your domain cools to 300K?

[mercypham]

My domain didn't cool down to 300K, it cools down to liquidus temperature and keep unchanged at this temperature (1670K)

[Rob]

There will be a reason for this, what else is set? 

[mercypham]

I set the wall BC (radiation and convection) for all domain.

[Rob]

If you've set all boundaries to 300K the fluid must cool to 300K. However, if you've missed a setting, fixed something or added energy from somewhere else you may find it won't behave as expected.