This is typical when importing STEP files specially from CATIA V5, terrible patched, not problem, if I run GEOMETRY > SOLID > CLEANUP command I get the following:
Solid Cleanup 1 Solid(s) Selected... Beginning Cleanup of Solid 1... Removing Redundant Geometry... Found 87 Redundant Point(s). Found 71 Redundant Curve(s). Cleaning Geometry... No Cleaning Performed on Geometry. Removing Small Features... 14 Small Edge Chain(s) Found. Small Feature Removal Complete. Optimizing Geometry... Geometry Optimization Complete. Saving Updated Geometry... Checking Geometry... Self-intersection near (-53.07134, -0.5, -41.71004). Self-intersection near (-52.69658, -0.5, -41.5631). Curve 2921 is invalid or corrupt. Failed Geometry Checking. Cleanup of Solid 1 is Complete.
The workflow always is the following:
To learn more take a look to the following videos:
Firstly very much thank you for quick reply.
can you help with doing this , You are an expert and can do it quickly than me. I have to submit my thesis tomorrow and struggling to complete this.
Please can you clean the cad and send me.
I will appreciate your help for life time.
Depending on what you are looking for and the areas that are "bad", you might simply try running Mesh->Geometry Preparation. It can often allow you to mesh over problem areas and still get a valid tetrahedral mesh.