Learning Forum

[ahmedshafie]

doing external flow with fluent , we supress geometry nso what is difference between making geometry region dead and solid ?n

[Keyur Kanade]

The dead region will not be refined with final sizes and will not be transferred to solution mode. nSolids will be refined as per sizes and will be transferred to solution mode. nPlease see help manual for more details about these commands. nRegards,nKeyurnGuidelines for Posting on Ansys Learning ForumnHow to access ANSYS help linksnn

[ahmedshafie]

so for external flow , solid region will have mesh while dead wont , does that affect study ?n

[Rob]

It depends. If you don't want heat transfer through the solid part then dead is fine. n

[ahmedshafie]

thanks for your answer , so heat transfer , also stresses applied to body right ? can i do fluid solid interaction afterwards if i select DEAD region ? n

[Rob]

You would need to map surface data to Mech and re-calculate the temperature field. If you want a temperature field in the metal bit(s) use Solid. n

[ahmedshafie]

Thanks alot , also Dead option has advantage that no solid mesh will be generated so less mesh elements used n

[Rob]

Correct. Dead is void (effectively) where as solid is meshed and part of the model & solution. nFor info, dead was originally the designation for non-fluid cells when we had full cartesian meshes and needed to fit the geometry into a cuboid (last needed in Fluent 4). Those cells were included in the cell count, but didn't use much RAM. The term was retained for voids in Fluent Meshing. n

[Mert Can]

Let's say I extract a flow volume for an internal flow problem and solve it. In the post-processing section, I want to show the external geometry from which I extracted the flow volume as a transparent solid model. how can I do that ? I can't see this geometry in the post processing section because I didn't include this geometry in the analysis (because I didn't create a mesh) while I was setting up the analysis.

[Rob]

In Fluent you can append mesh files, so it may be easiest to put a mesh onto the casing and read it into the solved model.