Hi
I am trying to make a simulation of a melting process of a square of Silicon 0.5m x 0.5m fixed temperature of 1941K to the left wall and 1687 K (melting point of silicon) to the right wall ( this with the intention to have a clear and observable liquid/solid interface). I was using the physics heat transfer in fluids (ht) and Laminar Flow (spf). I select (spf) because I wanted to see the effect of gravity on the melted material, then it suppose to show a nice melting front from left to right, but with a higher speed of melting in the upper part of my square of Silicon due to the clockwise flow of melted Silicon at the left side of the interface (analitical solution). However, no matter what it ALWAYS was showing error, error, error and error. One day I decided to disable the Laminar Flow node and finally it was working with a solution very nice and very similar to the analitical solution(upper part melting faster). After a few days the comsol software was updated to the latest version 5.0 and now it is showing a completely different results (uniform melting front).
Why they have different results ?
Why Laminar flow never reach a solution (convergence) ?
heat transfer by itself is enoguh to simulate that melting front or not ?
the last thing is....sometimes when I am running a model and it shows me error as result, I change the model for a model that I know perfectly works, but it still shows me the same error..... why ?
I appreciate any help on this topic that is very frustrating.
thanks........Michael........ file attached (properties are defined as variables in function on temperature by the equations in the analytic node)
now I am trying to attach the file, but the website is saying also error error.....
I am trying to make a simulation of a melting process of a square of Silicon 0.5m x 0.5m fixed temperature of 1941K to the left wall and 1687 K (melting point of silicon) to the right wall ( this with the intention to have a clear and observable liquid/solid interface). I was using the physics heat transfer in fluids (ht) and Laminar Flow (spf). I select (spf) because I wanted to see the effect of gravity on the melted material, then it suppose to show a nice melting front from left to right, but with a higher speed of melting in the upper part of my square of Silicon due to the clockwise flow of melted Silicon at the left side of the interface (analitical solution). However, no matter what it ALWAYS was showing error, error, error and error. One day I decided to disable the Laminar Flow node and finally it was working with a solution very nice and very similar to the analitical solution(upper part melting faster). After a few days the comsol software was updated to the latest version 5.0 and now it is showing a completely different results (uniform melting front).
Why they have different results ?
Why Laminar flow never reach a solution (convergence) ?
heat transfer by itself is enoguh to simulate that melting front or not ?
the last thing is....sometimes when I am running a model and it shows me error as result, I change the model for a model that I know perfectly works, but it still shows me the same error..... why ?
I appreciate any help on this topic that is very frustrating.
thanks........Michael........ file attached (properties are defined as variables in function on temperature by the equations in the analytic node)
now I am trying to attach the file, but the website is saying also error error.....