[saisanthoshm88]

I have a query regarding the radiation model to be used in cases where Fluid-solid interfaces are involved.
Here is an excerpt from the Ansys CFX solver modelling guide that tends to clarify upon this -
"For domain interfaces using the Conservative Interface Flux option, the radiation model must be the same
on both sides of the interface. That is, for Fluid-Solid, Solid-Solid, or Porous-Solid domain interfaces, the
Monte Carlo model is the only available option."

However, in a workshop for electronics cooling from the Ansys CFX Introductory training material, a discrete transfer model is used on the Fluid side of the Fluid-solid interface and the solid side of that interface is left to Monte carlo.

Could someone please provide a clarification on this.

[Opaque]

You are not giving a complete description of the model, and it is subject to misinterpretations.

You can have different radiation models setup across a domain interface as long as the boundary condition is NOT "Conservative Interface Flux" as described in the documentation.

From the statement above, and because Monte Carlo is the only available model for solid domains, the reverse is that a domain interface can only use the "Conservative Interface Flux" option for Fluid-Solid, Solid-Solid, Porous-Solid if Monte Carlo is used on both sides.

If another option is used, i.e. opaque boundary, the models on either side are independent.

To clarify your electronics example, you need the following information:

Radiation Model Fluid Side = ??
Radiation Model Solid Side = ??
Thermal Radiation Boundary Condition Option = ??

It is impossible to answer if the setup makes sense, w/o those 3 answers, you only described the first 2.

As far as I know, it is not possible in the ANSYS CFX-Pre interface to setup a case with

Radiation Model Fluid Side = DTM
Radiation Model Solid Side = MC
Thermal Radiation Boundary Condition Option = ConservativeInterfaceFlux

Hope the above helps,