Shell problem - meshing an opening

[Anonymous]

Hello.

I've sucessfully created an opening on a shell along with the opening stiffener (basically the panel around the opening).

The problem is that the mesh seems to be a low quality one. Any ideas on how you can create a good quality mesh?

[Rafal.Gaweda]

Try to decrease FE size or define it this way: cylinder containing two parts - one big, another - strip \ extruded arc a little bit bigger then openinig.

[Anonymous]

Hello Mr. Gaweda.

Well, decreasing the FE size doesn't help. And i'm afraid I didn't quite understand the second part of your sugestion.. could you explain it a little bit clearer for me?

Thanks!

[Anonymous]

Any ideas? 🙂

[Rafal.Gaweda]

I meant this. Ant the hole in red panel.

[harrison.gloyne]

Good Morning @Rafal.Gaweda

I have a query somewhat related to the thread above.

Context of Problem

Maintenance is required inside a steel tank (8thick steel shell). In order to gain access the following is required:

1 - Weld steel structure surrounding tank (ie - Weld the PFC bands to tank shell)

2 - Place 12 jacks around circumference of tank that are connected to this band

3 - Cut base of tank (at tank floor) and jack tank up approx. 0.7m

4 - Replace jacks (one-by-one) with 168CHS members and weld in place + install baseplate (See image 2)

5 - Cut hole in tank to allow access for maintenance inside tank 

I am trying to provide an opening to the shell as indicated in attached image. I have tried everything but i am unable to get the opening within the shell. Opening = 2.0m H by 1.5m wide (approx)

Any suggestions are greatly appreciated. 

For your information the Shell has been modelled as the following:

- Circle created on tank floor plane

- extrusion of circle (14.3m) in increments on 100mm (ie -143mm increments)

- discretization of 120 (ie - every 3 degrees of circle)

[harrison.gloyne]

Please see model attached (Robot 2022 Version)

*** I have tried uploading model but this error is appearing ***

[Romanich]

Hi @harrison.gloyne ,

zip the model first