Learning Forum

[Rizvi Arefin Rinik]

its a simple hollow twisted pipe having fluid domain inside. this is showing below error.....in my another design(flow inside tube) also same issue.... i used boolean substract in between solid pipe and fluid domain but still showing this.... what can i do to fix this????????? 

Note: zone-surface: cannot create surface from sliding interface zone.

Creating empty surface.

Note: zone-surface: cannot create surface from sliding interface zone.

Creating empty surface.

Note: zone-surface: cannot create surface from sliding interface zone.

[Rob]

The warning is simply telling you the solver can't display the walls that are created as part of a non-conformal interface.  Is there a reason you shouldn't have non-conformal interface zones? 

[Rizvi Arefin Rinik]

[Rizvi Arefin Rinik]

here is the cross section and front view of my mesh.....

i am a beginner in ansys...so if you could help me!

[Rob]

With what? You have a mesh and two zones. Share Topology (SpaceClaim) would be a good idea to avoid the interface.

I suggest you update to a more recent version (you're a fair way out of date) and then you'll also find Tutorials in the Help system. 

[Rizvi Arefin Rinik]

which one should i choose in share topology....none/merge/group??

[Rob]

Ah, the old options. Merge or Group ought to work, but if you update the software it's significantly better. Check options in the Workbench tab too: I nolonger have pre-2019Rx installed to check when the methods were updated. 

[Rizvi Arefin Rinik]

problem solved as i used shear topology......but i dont undestand the reason .....in some cases using boolean substract this types of issue can be resolved...but this time it didnt work...any way thank you.....but using shear topology is there will any effect on solver?? as from fluid heat transfer will take place into the shell.

[Rob]

Boolean is a CAD operation to create the bodies. However, in CAD we don't consider surface connectivity. Share Topology is the the modelling step to tell the geometry that the two (or more) coincident faces are connected and therefore flow/heat/stuff should be passed across the surface. Alternatively an non-conformal interface is created which sort of does the same thing but is computationally less efficient: we use them when they're needed but they're not needed here. 

[Rizvi Arefin Rinik]

so each time i need to use shear topology while i am creating fluid inside tube/pipe?

[Rizvi Arefin Rinik]

as you can see 2 parts here so when its on file name it shows share and also in pipe it shows shear... but in volume it shows none....do i need to set all of them in share?

[Rob]

You need to read the documentation. Share Topo is done just before transfer to meshing, and you need to use the options in the Workbench tab now you're in 22R1. 

[Rizvi Arefin Rinik]

yes i got you....thanks for the help.