# Mesh generation for surface bodies

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• Last Post 27 January 2019
• Topic Is Solved
rrathishubham posted this 26 January 2019

Hello everyone,

I'm trying to model a cooling tower as surface in which thickness of cooling tower varies with height. So I've created nearly 70 surfaces since I want to take into consideration the varying thickness. After this I tried to mesh the cooling tower but I'm getting distorted mesh. Following image shows the mesh I get

But I want the mesh as shown below:

I want 10 degrees interval between 2 consecutive lines.

I tried to combined those surface in spaceclaim and tried to mesh it but I got a warning,

I can get mesh as I want when I combines the surfaces but it does not consider varying thickness. Now, how do I mesh the tower with 10 degrees requirement.

sathya posted this 26 January 2019

Hi, Make sure the number of edges on the opposite side of the critical surface(and also for all) is same. Also add sizing and mapped meshing if needed.

rrathishubham posted this 26 January 2019

Hi, can you explain that what does that warning mean?

peteroznewman posted this 26 January 2019

Don't combine the surfaces in SpaceClaim.

Do use Shared Topology on the top level assembly in SpaceClaim.

In Mechanical, use Face Meshing on all the surfaces. This will force quad elements on each ring, and Shared Topology will force nodes to be shared.

rrathishubham posted this 27 January 2019

Sir, I tried to mesh as you said. But I'm getting mesh like this,

And these are the details of mesh

How do I convert the triangular mesh to quadrilateral mesh?

Also, I get a warning.

peteroznewman posted this 27 January 2019

Use a Face Meshing control to force Quad elements.

Make the first height of surface a little taller to try to avoid triangle elements.

I recommend you create beam elements for the columns under the tower.

Don't worry about a little skewness in the shell elements.

If you use a circular cross-section for the beams, then you don't have to orient them!