Learning Forum

[Taro Nojiri]

Hello, 

  I am a zoologist who tries to apply ANSYS for bioacoustic analyses such as simulation of the on/outgoing sound signal propagation in animal bones.   
  Especially I am struggling to conduct harmonic acoustic analysis and modal analysis for visualization of the in situ sound pressure level in animals. 
  To this end, I obtained the whole skull .stl data of a snake with micro-CT and Amira (3D visualization software) and imported it into workbench as the geometry file. 

 However, when I tried to generate mesh, the error "The mesh generation did not complete due to poor quality elements or incorrect input. Please try meshing with another mesh method or different mesh options. " is shown. Would anyone be able to point me to free software or a specific method to improve quality in mesh generation?

 

[Rob]

Assuming you're trying to create a volume mesh can you check in the segmentation software that all of the volumes have a finite thickness and no surface contact within a region? I've not tried small animal, but from human scans at 0.5mm voxel resolution sinuses become very corrupted and may need manual clean up: the segmentation tools typically have some good functionality for this. 

[Taro Nojiri]

Dear Rob,

 Thank you for your prompt reply.
 I used Amira 5.2 and manually segmented a 3D model of the entire skull of the snake, but I do not know how to check for surface contact in this software.
 Do you know of any software to check for the points you mentioned? I wonder if spaceclaim or MeshLab would be helpful.
 I would appreciate it if you could give me some feedback.

Best, 
Taro

[Rob]

You may be better checking with the Amira team. I know the Mech team do some checks in Mechanical, but that assumes you have a mesh! 

[Ashish Khemka]

Hello,

One suggestion is to go one by one and check which geometry is giving you issue while meshing.

Regards,

Ashish Khemka

[Rob]

And having asked one of the Discovery team, 

Repair > Check Geometry 

Prepare > Detect 

May be of some use. 

[Taro Nojiri]

Dear both, 

Much appreciated for your constructive suggestions. 
Thanks to your helps, I repaired mesh data with check geometry tool and successfully generated mesh.