Learning Forum

[abhishekkumar2r0]

As I am refining it, the doodled part only has straight lines forming long elements, no small hexahedral elements like in the other parts of the image. How to resolvethis

[Rob]

What have you set the various sizing options as? Why do you need a butterfly mesh? 

[abhishekkumar2r0]

The model is of CFD and it is hollow cylinder and fluid part is divided into 5 parts to creat uniform hexahedral meshing. I had done automatic method for the whole body and edge sizing of the edges dividing the fluid domain by choosing number of division as 100. And the result I am getting is in one sliced part of fluid domain long elements are formed instead of small ones. So how to resolve this or this can be solved as I am solving it for natural convection process when the tube is heated with a constant heat flux and nusselt number is to be calculated 

[Rob]

I'm aware of what a O-grid/butterfly mesh is, I'm just wondering why anyone would bother doing it now. 

You've set a cell size on the centre body. Have you set any sizing on the surrounding bodies? I'd favour using a single volume, inflate the boundary (read up on Sweep method) and pave the end face. It's far quicker and will likely result in a higher quality mesh. 

[abhishekkumar2r0]

Hey Rob

Can you suggest me some methods with which I can increase element quality aspect ratio skewness without opting for o-grid technique to do a structured mesh.

[abhishekkumar2r0]

And what metrics display should I follow for simulation in fluent 

[Rob]

On a circle? No, there's a reason for pave mesh and decomposition. 

[abhishekkumar2r0]

Yes on the circle so that I can get a structured mesh without going for o gird method

[Rob]

How do you propose putting a square into a circle without either decomposition or very skew cells? 

[abhishekkumar2r0]

Just followed you tube videos to create this mesh

[Rob]

Have you done the courses/lectures and tutorials available in Help?