Unable to do tetrahedral mesh for combined sphere

Hamsalekha

Hi,

I constructed a combination of two sphere. Initially, I faced some difficulty to combine two sphere using union but eventually I manage to do it by splitting it. 

In the first step, I initialized two spheres separately. I just combined them by changing the coordinates of the two spheres. 

Then, I used split command for both of the spheres and use union to combine all the spheres.

  

<?xml version="1.0" encoding="UTF-8"?>

 

 

After the split and union process, I set the region for both sphere as dielectric medium and set for FEM computation. However, when I wanted to create mesh, there were both triangular and tetrahedral mesh though I wanted only tetrahedral mesh. 

I also received the error message as shown below. 

 

Please help as I am not which part I have done error. I am not whether the error occur at the split, union process or in the initialization of the dielectric medium for the spherical region.

 

Thank you

 

 

 

 

 

Mel

From your image your still have two parts that touch, Union1 and Union2.

They still have to be Unioned. The model construction can be anything, as long as everything that touches belong the same part.

Hamsalekha

Thanks for your reply. 

After I constructed two combined sphere by changing the coordinate, I can't click the Union option. Now, after reading your reply stating as long as everything that touches belong the same part, I just combined two spheres and didn't modify anything since the two spheres are touching each other.  However, when I meshed them and tried to run the simulation, I receive this error: 

<?xml version="1.0" encoding="UTF-8"?>

Mel

Sphere1 and Sphere2 touch but the mesher does not 'know' this. The two spheres should be in a Union before meshing.

The GetStarted guide and the Example guide in the help folder of your Feko installation have many examples on basic geometry construction and the Union operation.