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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › Coupling two Fluent Simulations with System Coupling › Reply To: Coupling two Fluent Simulations with System Coupling

October 7, 2024 at 2:27 pm
marco.adorno
Subscriber

Hi Rob, thank you for your answer. 

I'm not doing it because by using a single domain to simulate both hot gas and porous material we have two option:

1) Use the LTE (Local Thermal Equilibrium), so assuming that fluid and solid (inside porous domain) are always locally at the same T. This is not valid generally, and additionally, this doesn't allow me to model the interface as a wall, meaning that the interface gradients will not be the correct ones. 

2) Use the LTNE (Local Thermal Non Equilibrium), so solving two coincident domains in the porous material: one fluid domain, in which we solve continuity momentum and energy eq, and one solid domain in which we solve only the energy equation. This is closer to reality, but Fluent doesn't allow me to thermally couple the solid interface with the hot gas domain. 

This is why I need to couple them externally.