Modeling Solidification - Tutorial - Doubt

Neethu_N · December 23, 2017, 07:41

In the Fluent tutorial describing a solidification problem (http://www.engr.uconn.edu/~barbertj/...2012/tut22.pdf) the steady state solution solution is first calculated and its solution is used as the initial condition for transient solution.
Can someone please help me understand why this was done so? What was the necessity of calculating steady solution and not the transient solution directly?

I am attempting the melting of a metal, and I have observed that the melting happens faster when the steady solution is calculated first, with all other conditions the same. But I do not understand the practical significance of this. Please help me out.

Badler · December 28, 2017, 09:35

This is due to fluid initialization.
If you start transient solution correctly, , fluid properties like pressure, temperature, velocity etc. are not initialized well in certain regions of the fluid and are not converged to certain values.
Therefore, in that regions results that you obtained are mostly wrong until fluid properties converge to some points.

December 23, 2017, 07:41	Modeling Solidification - Tutorial - Doubt	#1
Neethu_N New Member Neethu N Join Date: Nov 2017 Posts: 8 Rep Power: 9	In the Fluent tutorial describing a solidification problem (http://www.engr.uconn.edu/~barbertj/...2012/tut22.pdf) the steady state solution solution is first calculated and its solution is used as the initial condition for transient solution. Can someone please help me understand why this was done so? What was the necessity of calculating steady solution and not the transient solution directly? I am attempting the melting of a metal, and I have observed that the melting happens faster when the steady solution is calculated first, with all other conditions the same. But I do not understand the practical significance of this. Please help me out.

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December 28, 2017, 09:35		#2
Badler New Member Kürşat Join Date: Jul 2015 Posts: 2 Rep Power: 0	This is due to fluid initialization. If you start transient solution correctly, , fluid properties like pressure, temperature, velocity etc. are not initialized well in certain regions of the fluid and are not converged to certain values. Therefore, in that regions results that you obtained are mostly wrong until fluid properties converge to some points.