Learning Forum

[mmia1]

Hi

I want to connect pipe to a tank. I was able to create a hole in the tank shell like below using part trim.

Now I need to create another circle around that hole to model a reinforcing plate like below:

The problem is that there remains some gaps and the circle does not actually lies on the curved surface.

 

Does anyone know how I can do that? Thanks again.

[igandiko]

 

Please try “Project” option under “Geometry tool”, as shown in the picture below. The grey curve is original curve (circle) and red curve is the projected curve. 

 

[Alex R.]

Hello, 

Since the shell tank surface is curved, I would recommend creating a cylinder insted of a circle and cutting the surface of the shell tank with it. Please see below example with two cylinders. I have used Intersection tool in Geometry Tool (GeoTol -> Inter) and ended up with circle on the curve surface. 

Let me know if that helps. 

Alex. 

[mmia1]

Thanks for the suggestion. Actually thats not I intended to do. I have two keyword files (one for tank and one for pipe) created by Matlab that I imported in lsdyna. Then I created a spline curve at the intersection of tank and pipe using shell intersection like below:

Then I did part trimming option in tank part and removed the elements to represent hole like below:

Now I need to create another concentric circle which would be twice diameter of the hole created above like below:

[mmia1]

 

Hi

I am planning to make the above model simpler. Could you please tell me how I can create a hole of a certain dia in the following figure. Please take a note, the model is imported as mesh and its  a tank so curved surface. How a hole can be created on the tank surface? Thanks.

 

 

[Alex R.]

Hello, 

The workflow for a FEM simulation usually encapsulates first working on the geometries entities -> meshing -> running simulation. Please consider using geometries and geometry tool in LSPP. It's easier to create a cylinder as a geometry and  use tools like intersect/trim/stitch to end up with final geometry and then mesh it. Please consider below:

 

You can find short intro into LSPP here https://ftp.lstc.com/anonymous/outgoing/lsprepost/Training/Intro/LS-PrePost_Intro.pdf

Alex. 

 

[mmia1]

 

Hi 

Thank you for the reply. The thing is that I have to do a parametric study so I wrote a matlab code that prepares k files. I have a complex geometry of storage fuel tank and pipes together so I thought matlab code to prepare k files would be good for me.

So, is there no option or way available in LSDyna to do the exact operation you showed herein on the mesh part I mean the k file I imported in LSDyna (Fig. below)? If no then I think I have to do this in LSDyna instead of importing k files which will be time consuming. 

Thanks again.