Water to ice
 

Assume a pipe with fluid inside eg -5 degrees centigrade. Passing through a slab.

Above slab a layer of water eg 10 millimeters, and above the water layer air at eg 15 degrees centigrade.

Meshed every thing, selected; fluids, solids temps, .. k-epsilon, ... Can not see any ice?

What have I missed, please?

Fluent please, or CFX.

hi
did you activate the solidification or melting model?
did you define the melting or solidification tepreature and so on?
regards
ali

Dear Al

Thank you for your response.

1. Have activated Solidification and Melting. This is by simply selecting this model, in the Models menu.

2. Can not see where I can define the melting & solidification temperature. Please explain how I can do this?

Thanks.

Hi visitor
in the material panel you can find the solidification and melting temperature and also the latent heat which is required for the melting or solidification
best regards
Ali

Thank you for your reply.

I have entered 0C for solidification and melting, and 330kJ/kg for latent heat.

The ice layer is now formed, but almost constant at 0C. Where as the slab below the ice layer is at lower temperature, and the immediate air layer above ice is also lower.

Would expect the ice layer to be lower than just 0C, nothing changed, even when the slab temp was lowered further.

Thanks again for your clarifications.

HI VISITOR
would you post some detailed picture so that i can understand what is the difficulty?
thank you very much
best regards
Ali

Dear friend

Thank you for your response.

Please see attached file. It is upside down, but can be corrected.

Ice temp appears fixed at 273K, while temps below ice layer and above, in the air layer, the temps are lower.

thanks

setting intial starting body temperature
 

Another Q?

I assume that setting up initial start body temperature condition is done through the cell zone>Operating conditions, and then choose a temperature, in this case the beginning concrete slab temperature.

Fluent will then start calculations and find the new starting temperature.

The Q; Is there another way of doing this?

Got back to work, but now divergence !
 

Divergence has occurred because of temperature !

Will further lower URF to 0.6, & continue with k e- realizable - near wall treatment.

Hope this will work.

The solver actually run fine 80% through the transient simulation. But suddenly sharp diversion. This sudden divergence could be due to ice forming.

Will share with what ever I will come with, thanks.

hi dear ali
I have similar problem, energy and melting is one; however, there is no melting temp option or latent heat in material panel. How can I fix this problem??