Learning Forum

[Pinal]

[Rob]

The solidus/liquidus temperature is for a FLUID material only. Any nominally flowing materials such as "frozen" liquids and granular phases are still fluids regardless of their thermodynamic state. The solid materials are used for regions such as walls and blocks where only thermal conduction is solved.

[Pinal]

Agreed, but when a material (solid) is heated above the melting point in that case solidus and liquidus temperature is required for solidification and melting or to see melt pool.

[YasserSelima]

Array
In this case you define two fluids ... one describing the properties of liquid state, and one defining the properties of solid state. And in your model, you need to include a mechanism for mass transfer between these two materials.

[Pinal]

Array
Thank you for the answer. Could you please guide me on how can I incorporate mass transfer in ANSYS?

[YasserSelima]

From models, select multiphase ... then select your model .. VOF, or mixture ... then define your two phases. Select the materials you created ... and then go to phase interaction tab .. there you will find three tabs .. second one is for mass transfer. Increase the number of mass transfer modes to 1. then you can select melting,-solidification.

[Pinal]

[Rob]

To clarify, the "solid" in Fluent is something that can only move my mesh deformation. The solidification/melting model works on the fluid only and "freezes" that fluid so it doesn't move, it does not turn the frozen material into a solid.
In simulation phases and other definitions are slightly different. So oil and water would be considered as two phases even though they're both liquids. Similarly two different sized grannular particles of the same material would be set as two distinct granular phases, and they're be a fluid material type as they "flow" and move with the carrier fluid phase.

[Pinal]

As per your suggestion, instead of solid I have considered the material in the fluid stage. Now when I follow these steps (From models, select multiphase ... then select your model .. VOF, or a mixture ... then define your two phases. Select the materials you created ... and then go to the phase interaction tab .. there you will find three tabs .. the second one is for mass transfer. Increase the number of mass transfer modes to 1. then you can select melting,-solidification.) instead of melting and solidification, I can see the option of evaporation and condensation, which is obvious because of how can liquid melt further, did we miss something?

[YasserSelima]

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Sorry, my bad .. I was wrong.

The procedure is explained in Chapter 28 in the user guide manual, you can access it from here

Press the help button in Fluent, this will open your browser. Copy and paste this link in the same browser

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v202/en/flu_ug/flu_ug_chp_melt_freeze.html?q=melting

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[Pinal]

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Can we measure stresses in the ANSYS fluent? If yes can you please share some related materials?

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[Rob]

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Shear stress or do you mean on the solids? There's an intrinsic FSI model in Fluent but as melting materials are defined as fluids it'll not be applicable.

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[Pinal]

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I have simulated the melting and resolidification of the material. I want to simulate induced thermal stresses during solidification in ANSYS fluent.

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[Rob]

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We can export the solid surface position (stl option in the Design Tool panel)

To get the solid skin. You'll then need to create a solid mesh. It's also possible to export the temperature for the domain, but you may need to trim that to suit the Mechanical model. Then you need to update this every some time steps as the solid grows and cools to find the stressy stuff in Mechanical. So, in theory it's possible, but as a Fluids specialist I'm not sure how. Steve might have some ideas from the FSI side of the solvers.

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