Mesh creation failed in SW simulation

Hello All,

I have a simulation that cannot create a mesh for some parts. 

As you will see in photos these are pipes basically, but whenever SW treats these as beams I have other problems as I don't have standard type joints as these are cut by other parts at the end.


So I converted all of it to solids and also using smaller mesh triangle settings but still, I have missing parts.

Why do you think this might happen and what do you recommend.

As this should be classified document, I cannot share the SW model but I can only share the screenshots anyway.. :)

If you can also just share how to set up a model before the analysis for me to get used to the proper set up it would be also good.

Thanks in advance..