Learning Forum

[dhaya400]

Hi,

My geometry contains 2 fluid domains separated by a interface. During the simulations, I convert one of the fluid zone into solid. Hence a shadow wall is automatically created.

But when I bring back the solid zone into fluid zone, the shadow wall is not getting deleted automatically. Even I tried to delete manually, but it is not possible.

Would anyone suggest a method to delete the shadow wall?

[Amine Ben Hadj Ali]

Verify if that "name-shadow" is still interpreted as a wall: if yes try to change it to interior (if mesh is conform otherwise an interface is required).

[dhaya400]

Hi DrAmine Thank you for the reply.
Still it is interpreted as wall. and no option available to change.
While importing the fluid zones into the fluent, the interface is automatically created. But, when change the one of fluid zones to solid, shadow wall is created.
When I bring the back zones again to fluid, the shadow wall is not removed or changed to interior.

[Rob]

That may be linked to how the interface condition is assigned to the fluid:fluid and fluid:solid system. What does the interface setting look like?

[dhaya400]

Hi Rob Thank you for the reply. The interface is created automatically when I import mesh into fluent.

[Rob]

Is there a reason for needing a nonconformal mesh, or just that you didn't know to share topology? What do you see if you edit "contact_region"?

[dhaya400]

Hi Rob By selecting the edit "contact_region" in the mesh interface. (below window pops up)
I want to have a interface where flow has to travel form one fluid zone to another fluid zone. For that which interface option I have to choose?
The mesh look like below

[Rob]

Leave them blank, if you click on Help it'll explain what they're for and they're not needed for a fluid-fluid interface most of the time. That mesh looks to be about the same so I'm slightly confused why you didn't use share topology to give a conformal mesh. Interfaces are really useful but I only use them if I need them.

[dhaya400]

Hi Rob Then why the shadow wall is created? How to remove the wall? Because of the shadow wall, fluid is not entering into the fluid zone.

[Rob]

The wall should only do anything if the interface isn't connecting (ie there's no overlap). However, as you've set the zone to be fluid from solid you may have confused the solver. Delete the interface and see what boundaries are left, display these to see where they are & post the results.