Complex multiphase melting problem
Hi,
The problem i'm dealing with involves the pouring of molten steel into enclosure which contains an aluminum block. I would like to simulate the melt process of the aluminum block by the molten steel. In such case, it becomes a 3 liquids problem (molten steel, molten aluminum and air). Is ANSYS CFX capable of performing such calculations? I would appreciate your help a lot!! Thanks |
Yes, but you will have to do a lot of development in melting models. This sort of stuff is not built in. CFX support might have some examples of melting to get you started, but expect to do a lot of model development before it is accurate.
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Hi Redpoko,
The case you presented seems to be much simpler than mine. Would you like to model the pouring process also or is it enough to start from a filled pool? For the first case, it would be a 2-phase problem (mine is 3). Try google for commercial casting problems. Several codes such as FLOW3D, MAGMA, etc. are designed especially for casting problem. In the second case, it would be a simple 1 phase problem, which I don't think is an issue. |
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ghorrocks! Thanks for the reply! Could you please extend your reply on which models I would have to develop(in CFX programing language, right?) ? As a first step I was thinking to model to the molten steel and air as liquids only. The Aluminum would be a solid, and I'm interested in obtaining the heating of it, without becoming liquid nor absorbing latent heat. Would it still require development of melting models? Thanks again! :) |
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The tricky bit will be the phase change of the aluminium melting. That will require development. |
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However, during the iteration the energy imbalance is always 100%. Finally simulation is terminated by fatal errors after 3000 steps. I am still working on it to figure out what's wrong with it. If you have any ideas, i am very glad to be informed. :) |
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To model the evolution of latent heat, you have two options: 1- Define two different materials for the liquid and solid phases of aluminum. Make sure that the difference between the reference enthalpies of solid and liquid phases at the melting temperature is equal to latent heat of fusion. 2- Take the derivative of the enthalpy curve of your material to obtain the c_p curve, which must have a peak at the melting temperature. Use it as the specific heat of your material. To model the solid phase, you have to add a dominant source term in momentum equation to overwrite the CFX calculated velocity field. You can also use a high value for the viscosity of the solid phase. |
AL and Si casting
My Dear Friends i want to simulate a problem where in have to casting for al and si liquids in a single jar with rotating. i want to find the volume of aluminium and silica after getting solidified. silica is 15% and al is 85%.
Please help me |
Sounds like you need casting simulation software, not a general CFD code like CFX. CFX does not have models to do what you want to do.
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no dudue i feel we can do it in FLUENT but exactly how i dont know
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You can do it in CFX as well but you are going to have the develop a lot of models to get it to work. If you are not experienced in CFD development then I recommend you use software specifically written to model casting, such as http://www.transvalor.com/en/cmspages/thercast.6.html or https://www.esi-group.com/software-s...turing/casting
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