Learning Forum

[zss]

Hello! Trying to solve an external fluid problem I've faced a bug I guess. If at the initial position the imported geometry is faced to the flow with its blue side - everything works fine. After reversing faceted body everything remains the same. But if you delete one facet from reversed body the flow starts passing through whole body. Then after recovering the hole flow still pass through the body. The only way to make everything works fine is to reverse body with its blue side towards to the flow then hide body and show it again.

[Subashni Ravichandran]

Hello Zagrebelny

Could you please check if the surface in the middle is added to the Simulation bodies? You can right-click on the surface and select 'Add to simulation bodies' and refresh the simulation. 

Here are the steps I followed to re-create your issue.

1.  Created a geometry similar to yours and run the simulation with default settings.
    
2. Reversed the surface in the middle and refreshed the simulation.
    
3. Deleted the third surface and refreshed the simulation.
   

Hope I have followed the steps as per your suggestion. As you can see, I'm unable to reproduce your issue.
 

Does this issue occur with one specific model or is it reproducible with other models as well? If it is specific to this model could you please share the model with us?

[zss]

Subashni thank you for reply!

Try importing body faced its red side to the flow

or

Reverce initially blue side faced body to face the flow with its red side. Then delete one part of the body (make a hole in it).

Just in case everything will work fine, i share my test model.

🛈 This post originally contained file attachments which have been removed in compliance with the updated Ansys Learning Forum Terms & Conditions

[ERab]

Hi Zagrebelny Since Discovery Live is only meant to work on closed volumes, and as Subashni mentioned its treating them as such.  If not, in the Facets tab at the top (need to expand menu) there is autofix or holes tool to cap off the ends, or a thicken tool to add enough thickness for the fluid to not pass through.  Thickness has a direction option relative to the normal direction of the facets...pink should always be on the inside.

 

[Subashni Ravichandran]

Zagrebelny

Thank you for sharing the model. I will check from my end and keep you updated

[Subashni Ravichandran]

Zagrebelny

I had a discussion with my team on your model and we could reproduce some inconsistency in the results.

Ideally, Discovery Live should work only with closed STL bodies. In the example shared by you, Discovery Live is considering the cylinders to be a closed body. As a confirmation to this, you will see that there is no flow passing through the hollow region of the cylinder.

As to the thin curved sheet, ideally, it should not be recognised for simulation in Discovery Live but the fact that it is being considered sometimes in your example and in the example provided by me is rather confusing. 

This issue will be reported to the development team.