[Water]

I am simulating an open channel flow using VOF model. I divide fluid domain into different zones and I use different tet mesh sizes for each zone. When I plot the free surface it shows a gap at zone interfaces (see attached). The mesh sizes of these zones are 0.8m and 0.5m.

Are there any ways to plot the continuous free surface in this case?

Thanks in advance!

[SPH_CFD]

Originally Posted by Water

I am simulating an open channel flow using VOF model. I divide fluid domain into different zones and I use different tet mesh sizes for each zone. When I plot the free surface it shows a gap at zone interfaces (see attached). The mesh sizes of these zones are 0.8m and 0.5m.

Are there any ways to plot the continuous free surface in this case?

Thanks in advance!

First, you must make sure that your geometry is continuous.
After that, when you open 2 zones, yous must choose "merge"

[Water]

I used Rhino to created the geometry and DesignModeller to slice it into different zones and applied different mesh sizes to each zone, so it should be continuous.

What do you mean by "merge 2 zones"?

[oozcan]

Originally Posted by Water

I used Rhino to created the geometry and DesignModeller to slice it into different zones and applied different mesh sizes to each zone, so it should be continuous.

What do you mean by "merge 2 zones"?

you can do ''joining'' two bodies into only by using ''merge'' button. Do not forget making merge boundary zone as ''yes''.

Kind Regards,

[Water]

Can you tell me where the "merge function" is? In Fluent - Mesh Interface - I used "matching" for mesh interface, is this the one you're talking about?

[oozcan]

Originally Posted by Water

Can you tell me where the "merge function" is? In Fluent - Mesh Interface - I used "matching" for mesh interface, is this the one you're talking about?

merge is not function !.It is a operation that is found in DM. Your problem is disconitunity from two bodies that you have splitted. Right ? !


You can find the solution by merging them.!

[SPH_CFD]

Originally Posted by Water

I used Rhino to created the geometry and DesignModeller to slice it into different zones and applied different mesh sizes to each zone, so it should be continuous.

What do you mean by "merge 2 zones"?

Please, upload picture of your geometry before generating mesh. I just want to make sure your geometry is continuous. After that, I can show you more

[Water]

But if I merge two bodies, can I still apply two different mesh sizes for each?

[Water]

Here is the part of geometry where I applied "slice" operation. If my geometry wasn't continuous, how fluid can flow from one zone to another?

[Water]

This image should give a better visualization of zone interfaces.

[oozcan]

Originally Posted by Water

But if I merge two bodies, can I still apply two different mesh sizes for each?

you can do it by using split edges in DM in ''a part''