ansys simulations for the vacuum system

Nick Gazis, CERN-BE/RF & NTU-Athens 1

ANSYS simulations for the Vacuum System

17 January 2011

Nick Gazis, CERN-BE/RF & NTU-Athens 2

Case Study Model Results

Summary & Future Steps

17 January 2011

Index

Nick Gazis, CERN-BE/RF & NTU-Athens 317 January 2011

Case Study – Subassemblies for analysis

CLIC prototype module Type 0

Case 1: Vacuum Tank

Case 3: RF NetworkCase 2: Vacuum Network

Nick Gazis, CERN-BE/RF & NTU-Athens 4

Case 1: Vacuum Tank

17 January 2011

Previously analyzed model (Z.Shah)

Differences to the previous analysis: i. Complete subassembly modelization;ii. Vacuum forces introduced;iii. Different element and meshing

options integrated;iv. Realistic modelization/simplification

of the bellows;v. No remote extrapolated forces;vi. Realistic supporting conditions.

Nick Gazis, CERN-BE/RF & NTU-Athens 5

Case 1: Vacuum Tank

17 January 2011

In need of bellow model simplification due to the complexity of the geometry:

i. Vacuum Force (via the mean diameter);ii. Bellow stiffness.

Before mentioned sizes calculated for the realistic bellow modelization (input form A. Samochkine & C. Garion).

Bellow convoluted part Equivalent Pipe Dm: diameter, Ep: thickness, Lb: length, E: material modulus of elasticityDm=Internal diameter+Height

convolution=(ID+OD)/2Crosse section: Sint=π*(Dm^2)/4Kax: Axial stiffness Section: Seq= π*Dm*Ep=Kax*Lb/E Thickness: Ep=(Kax*Lb)/(E*Dm*π)

Nick Gazis, CERN-BE/RF & NTU-Athens 6

Case 1: Vacuum Tank

17 January 2011

No use of “advanced size function” and “fine

meshing”

Different meshing settings were tested so as to succeed realistic results.

Use of “advanced size function” and “medium meshing”

~ 100 000 nodes ~40 000 elements

Model Built-up

Nick Gazis, CERN-BE/RF & NTU-Athens 717 January 2011

Deformations

Case 1: Simulation Results

17.5 μm of deformation, only due to vacuum forces

Equivalent model stresses < 50 MPa on the max deformation region

Nick Gazis, CERN-BE/RF & NTU-Athens 8

Summary of Accomplished Tasks:•Calculation of bellows simplification;•Simulation of the overall subassembly of case 1 (vacuum tank) for the vacuum forces.

Future Tasks & Testing:•Update of case 1 (vacuum tank) analysis with pump loads and vacuum network loads;•Simulation of case 2 (vacuum network) and case 3 (RF network);•Simulation of the overall model of the three presented cases (vacuum tank, vacuum network and RF network).

Summary & Future Steps

17 January 2011

Comments are always welcome!

Nick Gazis, CERN-BE/RF & NTU-Athens 9

Thank you!

9Nick Gazis, CERN-BE/RF & NTU-Athens17 January 2011