25th May 2005 – EDMS 591490 1

TS/CV/DC CFD Team

M. Battistin

TS/CV/Detector Cooling - CFD TeamTS workshop

Archamps, France, May 24 – May 26, 2005

Michele Battistin

A future for Computational Fluid Dynamic at CERN (?)

25th May 2005 – EDMS 591490 2

TS/CV/DC CFD Team

M. Battistin

25th May 2005 – EDMS 591490 3

TS/CV/DC CFD Team

M. Battistin

From fluid dynamics to Computational Fluid Dynamics

• What is CFD

• Industrial and CERN applications

• The CFD service team at CERN

• Opportunities

• What future for this team?

25th May 2005 – EDMS 591490 4

TS/CV/DC CFD Team

M. Battistin

Computational Fluid Dynamics

Computational Fluid Dynamics (CFD) is an analysis of fluid flow, heat transfer and associated phenomena in physical systems using numerical methods.

The basis of computational fluid dynamics is the reduction of the continuum differential equations describing the dynamics of the fluid (Navier-Stokes + mass and energy conservation equations) into a system of algebraic equations at a finite number of "grid" points, and the solving of the equations at these limited number of points only.

CFD is developing fast in many industry fields

25th May 2005 – EDMS 591490 5

TS/CV/DC CFD Team

M. Battistin

A wide range of application fields

Aerospace

Automotive

Biomedical

Buildings

Chemical

Environment

Marine

Power gen.

Turbo-machinery …and at CERN?

25th May 2005 – EDMS 591490 6

TS/CV/DC CFD Team

M. Battistin

CNGS Horn Air Cooling

CFD simulations helped to decide modifications even during the construction phase

Particle energy deposition heats up the horn and its

shielding structure

25th May 2005 – EDMS 591490 7

TS/CV/DC CFD Team

M. Battistin

CFD for safety too

Cavern floor: where some person could be present

Velocity iso-surfaces

25th May 2005 – EDMS 591490 8

TS/CV/DC CFD Team

M. Battistin

Alice Muons Detector heat transfer

25th May 2005 – EDMS 591490 9

TS/CV/DC CFD Team

M. Battistin

Alice ITS: no time for prototypes

At CERN, most of the times, the final system is the prototype.

CFD can provide insight into fluid flow problems when experimental techniques are too expensive or physically impossible.

The Alice, ATLAS and CMS Inner Trackers are good examples.

25th May 2005 – EDMS 591490 10

TS/CV/DC CFD Team

M. Battistin

SPS magnet LHCb PS/SPD

Who performs these simulations

25th May 2005 – EDMS 591490 11

TS/CV/DC CFD Team

M. Battistin

…a new team… and its opportunities

A “TEAM”

Identity & Image

Problems

sharingWeb page

Weekly meeting

sQuality

procedures Archivin

g EDMSStandar

d reports

Training problem

s Knowled

ge transfer

Turnover

Books Software versions

Theory

Supplier support

Long term

contracts

Workload

How projects arrive

Efficiency

User or client?

Seminars

Bulletin

Computing

powerParallel calculati

onWeb page

Flyer“advertisin

g”

25th May 2005 – EDMS 591490 12

TS/CV/DC CFD Team

M. Battistin

Computing power IS the limiting resource of CFD

The Grid will become soon THE natural calculation environment for CFD applications.

CERN CFD team could have the opportunity to run simulations in this environment with an important advance and advantage over the industry!

• LxParc (6 DP machines)

• OpenLab tests

• 20 Itanium 64 bit DP machines cluster

• 20 kCHF to improve ~8 times the calculation speed

• IT could support the implementation of CFD on GRID

25th May 2005 – EDMS 591490 13

TS/CV/DC CFD Team

M. Battistin

Experience and continuous training

High turnover doesn’t allow knowledge consolidation

Induction training:Technical studentsSpanish & Portuguese programsProject AssociatesDoctoral StudentsFellows

An important competence on this field can be achieved only with a long term training strategy which unfortunately is not compatible with the present nature of contracts of the team members!

In order to maintain at least the CFD framework a dedicated staff position with the mandate of technical coordination of the team is required!

25th May 2005 – EDMS 591490 14

TS/CV/DC CFD Team

M. Battistin