[newtoansys12]

Hi everyone,

I am relatively new to ANSYS software and am currently using the student version it for a university project and would like to seek some advice on the problems I am facing.

I have tried to model the air cooling by drawing a box surrounding my cylindrical cell, including an inlet and outlet side. I tried a few inlet velocity between 5 - 15m/s with temperature of air and cell at 298K, a discharge rate of 3C and convective heat transfer of 15W/m^2K. However, after the simulations, I realised that the temperature of my cell is not lowered even with air cooling.

I figured maybe it is because the fluid domain and the solid domain is not interacting with each other because ANSYS workbench does not support volume meshing so I switched over to using ANSYS Fluent 2022 R2 to volume mesh it instead. However, the convection tab isn't there under boundary conditions and I can't proceed. I am not even sure if I am supposed to use this as the options seem really complicated.

I would really appreciate it if there is someone who can give me some advice on how to carry out the modelling / meshing of this. It would be great if this could be done under ANSYS workbench.

Thank you so much in advance!

[AlexanderZ]

-> in ansys design modeler put all bodies into 1 part.
-> Now in mesher you will created conformal mesh automatically
-> which will pushes fluent to create shadow walls on the boundary between fluid and solid regions
-> which guarantees heat transfer between fluid and solid parts

other options is to create interface manually

[newtoansys12]

Hi AlexanderZ,

Thank you for the reply, I followed your steps and I think it worked however the boundary conditions only have heat flux, temperature and coupled. There are also two walls now including the shadow wall. If I want to simulate a initial battery temperature of 298K, do I set it on the shadow wall or the other wall and leave the other wall as coupled? Thank you!

[AlexanderZ]

if you need heat transfer from solid to fluid you need shadows (it has coupled boundary condition inside)
-> so you can't specify temperature on this boundary, otherwise no heat transfer will be considered

if you need to set initial temperature use PATCH to your solid zone (available after initialization)
if you want to define constant temperature of any part go to that part, turn on fixed values, in fixed tab define your temperature (available if energy equation is ON)

[poltushima]

Just wanna add that, with your air cooling model, it's crucial to ensure the fluid and solid domains are properly interfaced for heat transfer to occur effectively. The absence of temperature drop suggests there might be an issue with the boundary conditions or the interaction between the domains.
Since you're working with lifepo4 cylindrical cells, which is known for its stable thermal characteristics, accurate simulation is key. Have you checked the mesh independence to ensure the results aren't affected by the mesh size? Sometimes refining the mesh around the contact surfaces can help.