[pancard]

hi, friends, i try to simulate the welding process using VOF + melting/solidification models in FLUENT. it is a simple principle that metal is solid and won't move below solidus temperature.
However, i found the situation was not like that.
let's look a simple test case.
this is initial state; constant ambient temperature; the whole region is considered as fluid domain. of course the melting/solidification model is used.
001.png

after 0.02s
002.png

metal material is apparently moving, which is wrong.

any one have a idea about what is going on here? is it because the solid is a fake solid in VOF model?