[erikzaba]

Hello,

I am trying to create a simulation where lagrangian particles in a gas continua will collide with a supercooled liquid continua. To do this, I created 2 parts that are in contact, one region for the gas, and one region for the liquid. Then, I made a shell region at the intersection between these parts.

From there, I have one part mesh continua, 2 physics continua (one for the liquid, and the other for the gas where I have lagrangian phase, fluid film, and multiphase interaction model). Using the shell region I can create a fluid film interface (I want to model heat transfer from collisions to liquid region and potentially ice development).

I was wondering if this would be an appropriate method to model the freezing of the liquid continua due to the colder particles colliding with it.

EDIT:

I don't think this is an efficient way to achieve my objective. I am also considering using a baffle interface between the liquid and the gas (this was my initial approach), but the manual does not explicitly state if heat transfer is accounted using the STICK interaction mode between a Lagrangian particle and the baffle. It explicitly states that heat transfer with a wall is not accounted, but I am not fully confident with the difference between a wall and a baffle from just reading the manual.

TO SUMMARIZE:
Is heat transfer accounted (can I monitor it?) between a baffle interface and a lagrangian particle colliding with it using Stick interaction between them? I am using heat conduction between the baffle and the 2 regions.

Sorry for the long post and edit, I am new to forums and Star-CCM+ in general.

Any help is appreciated

[Marc_462]

I’m trying to understand your problem better. Providing more details about the boundary conditions, geometry, and domain would be really helpful. Based on what I can gather, I think that the Lagrangian approach might not be the most suitable for your case. A Dispersed Multiphase (DMP) model could be a better option. This model simulates the flow of dispersed particles in a continuous phase using a Eulerian approach.

That said, more information about your setup would allow for a more precise recommendation. Could you share additional details?

[erikzaba]

Thank you for your reply.

Here I attach a sketch of the setup. The reason I am using a lagrangian particles approach is because I have information of the particle size, temperature, velocity, and location of collision with the liquid-gas interface from other simulations, so my plan is to use a parcels table to inject these particles right above the interface. I would like to know the heat transfer between the interface and the particles, as well as potentially freezing the supercooled fluid, which is why I was initially thinking of using the fluid film approach, but it doesn't seem to be applicable unless there is a solid wall under it, so the baffle interface is my current approach unless suggested otherwise.

[Marc_462]

You can likely model your multiphase problem using a single physics continua.

Regarding heat transfer between the interface and particles, you can monitor particle properties by activating the boundary sampling function in the Lagrangian phase settings. However, with the Stick boundary condition, you might lose the ability to evaluate or visualize particle properties at the interface.

Given this limitation, I am not sure if heat transfer monitoring is possible with the current setup.

[erikzaba]

Thank you for your suggestion. I am using 2 physics continua because I want to have the melting/solidification model for the supercooled fluid. However, I also want to have the thermally conductive option for the baffle to allow heat transfer to/from the supercooled liquid due to collisions . The problem is the melting/solidification model requires segregated flow, and a coupled approach is required for thermal conduction across the baffle. Any suggestions on how I could I approach that?

[Marc_462]

I understand that these are not the exact problems you aim to model. However, the tutorials "VOF: Melting-Solidification" (pag: 9694 UserGuide_16.02) and "Dispersed Multiphase: Airfoil Icing" (pag: 10095 UserGuide_16.02) might offer valuable insights for further developing and monitoring your multiphase interactions.

Best regards,
Marc