Learning Forum

[MohamedKhaled1]

Howdy;

I am trying to mesh two pipes connected together (first pipe has an angle 50 degrees and second pipe has an angle 70 degrees) and have an inner shaft (pipe) with Eccentricity=50%. Fluid will flow between inner and outer pipe

I successfully build a structural mesh with this configuration (attached). But when i tried to change the inner pipe eccentricity to be 30% or concentric; i always got an error message "Multi zone blocking decomposition failed" . After many trials of trouble shooting, i found that the problem occurred when i split the inner wall into four equal division.

I mainly Split the face, outer and inner wall to make a good structural mesh and when i do not split the inner shaft, i got a very poor quality mesh.

Can anyone suggest how can i solve this problem

Thanks;

MS

[MohamedKhaled1]

Here are some pictures

 

[MohamedKhaled1]

[Rob]

Did you select hard sizing on those edges? If so set as soft and try again. 

[MohamedKhaled1]

Thanks for your reply

I tried soft and hard sizing. The best combination, i find to get this structural mesh with E=0.5 are:

1- Split the faces, inner and outer walls in four planes

2- Hard sizing on the edge of the outer pipe

3- Soft sizing on the radial division between two pipes

When ever i applied these procedures without split the inner wall into four planes (to avoid Multi zone blocking decomposition failed error occurred with Eccentricity less than 0.5); i got a very poor quality meshes (attached before)

[Rob]

You might want to look at whether you can use an unstructured mesh on the end faces so you have a more uniform cell size. 

[MohamedKhaled1]

Thanks i will try that