Is Solid Geometry Mandatory to Define Young’s Modulus in Fluent?

[trytobeanas]

Hi,

I am working in ANSYS Fluent and exploring options to model compliant wall behavior under fluid pressure loading.

One possible approach appears to be intrinsic FSI within Fluent. However, my understanding is that intrinsic FSI requires defining a solid domain (i.e., creating an actual solid geometry region) where material properties such as Young’s modulus can be assigned.

My questions are:

1. Is it mandatory to define a solid geometry zone to use intrinsic FSI in Fluent?

2. Is there any way to introduce Young’s modulus or elastic wall behavior as wall boundary conditions without explicitly modeling a solid domain?

3. Can compliant behavior be implemented using dynamic mesh, spring-based boundary conditions, or a UDF without full structural coupling to ANSYS Mechanical?

My goal is to capture pressure-induced wall deformation while avoiding full two-way FSI and structural solution if possible.

I would appreciate clarification on the correct workflow and limitations.

Thanks

[Rob]

Once you switch on Intrinisic FSI the solid properties panels expand to cover the various bendy material properties (Young's Ratio, Poisson's Modulus etc). I can't remember if you need a solid zone or not, but suspect you do because otherwise there may not be a way to prevent surface contact. 

It should be covered in the Documentation, and there may be additional content in Help (Tutorials & video) or in Learning.