[ghorrocks]

This sounds like you need a good thermal model as well, and this will require the latent heat correctly modelled, this will be a challenge. Also you will need to develop some model for solid material, presumably this will be a high viscosity fluid. You will need to make the viscosity high enough that the solid material does not move significantly but low enough that the simulation converges. This is not always possible.

[Danial Q]

yeah it is true that this problem is quite tricky and needs some special treatment and concentration along with skills. I have value for latent heat but i dint get your point about solid and its viscosity. because solid is going to be defined as separate domain here ,if you are talking about the solid which is substrate (steel) also. Becuase its viscosity is no where mentioned in the code i am following or trying to redevelop.it is tretaed as separate entity or domain on material properties given in ANSYS library.THe heat transfer model for solid domain is used" thermal energy".
If you are talking about the solid which will be treated as droplet in molten form and solid ( after cooling/solidification process) then it is treated as two components (liquid Ni and Solid Ni) along with Air in Fluid pair system, and then modelled.
i hope if i understood your point right, otherwise please mention it.
My point is >>should i consider it as moving mesh?? and how should i define the interface so that i could develop a relation b/w contact angle and time?
Thanks

[ghorrocks]

I did not understand your last post, but that is not important now. I recommend you do tutorials about conjugate heat transfer (CHT), multiphase flow and moving mesh so you understand these models before going any further.

[Danial Q]

Thanks for ur recommendations, i will go through them again. My last point was about the interface which is developed b/w Ni (when it is solidified) and substrate.As theoretically there exist an interface which should be mentioned in simulation after hitting and solidification. The previous student mentioned it by adding domian interface and then modelled it. What is ur thought abt moving mesh, if this problem lies in this category??

[ghorrocks]

I asked about this many posts ago. You can model the solid with an interface at the solidification front but this is very tricky to actually implement and even harder to get to run. Modelling the solid as a fluid with a very high viscosity is easier if it works - if you can get the large range of viscosities to converge that is.

[Danial Q]

so , u think defining a domain interface b/w substrate (steel) and molten droplet (Ni) is gonna be a tricky approcah to the problem. Yes convergence has been a big deal earlier. But i ave to follow it as i have to prepare a replica first, for the later work.
" Modelling the solid as a fluid with a very high viscosity is easier if it works - if you can get the large range of viscosities to converge that is".which solid r u talkin abt here?? its steel if i am right but i dont think it would would work for me.thanks

[ghorrocks]

The steel plate (which I assume does not move, just gets hot) should be modelled as a solid, this is straight forward. It is the solid region in the Nickel which is tricky.

[Danial Q]

Yea got it. ofc substrate is not moving ,its only nickle. i need suggestion about another point that is " another approach used was about using one of steel boundary ( on which Ni hits, infcat top of steel) can be defined as interface b/w Ni and Steel? rather defining the domain interface separately.
And one more thing about fluid and particle definition part, should i define splat (Ni); as liquid Ni and Solid Ni separately as components, by adding them as new materials in library. Or i should only use library material Ni and there is some other option available later in setup to use them as component? i am confused abt it bcz i did'nt find anything about defining them as components later .
Thanks a lot

[ghorrocks]

The way you set it up depends on the approach you are going to use. If you are going to use the moving mesh interface tracking approach then you have one domain with air and liquid Ni, and another domain with solid Ni. If you are going to use the high viscosity approach you have a domain with air, liquid Ni and solid Ni (modelled as a liquid with high viscosity).

[Danial Q]

can u plz explain this error;

"In Analysis 'Flow Analysis 1' - Domain 'splat' - Fluid 'user Ni': Equilibrium phase change in one phase in an MPF run is not supported by the solver".

What is the MPF ERROR?

[ghorrocks]

Not sure, maybe multi-phase flow. You would have to ask support.