Raffaello Sobbia (Group 8142):: Stefan Joray (Group …...Raffaello Sobbia (Group 8142):: Stefan...

WIR SCHAFFEN WISSEN – HEUTE FÜR MORGEN

IP2 2016 fluid dynamics simulations

Raffaello Sobbia (Group 8142):: Stefan Joray (Group 8141):: Nicholas van der Meulen (Group

4703):: Daniela Kiselev (Dept. 8100) and Michael Wohlmuther (Group 8142) :: Paul Scherrer

Institut

CADFEM ANSYS Simulation Conference 2019 19.06.2019 Technische Hochschule, Rapperswil.

• Brief introduction to PSI High Intensity Proton Accelerator (HIPA) facilities, one of

the most powerful accelerator in the world!

• Isotope Production at PSI: overview, aim, brief description of radionuclide

development at PSI

• Geometry of IP2 2016 and major difficulties in simulation

• Goal of this study (2016)

• Simulation procedures

• Results

• Ideas for future work

Outline

Injector II Cyclotron 72 MeV

Ring Cyclotron 590 MeV

SINQ spallation source

2.2 mA /1.3 MW

1.5 mA /0.9 MW CW operation

/ secondary beamlines

target M (d = 5mm) target E (d = 40mm)

UCN source

Cockcroft Walton (particle accelerator)

Proton therapy center [250MeV sc. cyclotron]

SINQ instruments

dimensions:

120 x 220m2

Overview HIPA

Isotope production station

Overview HIPA: detail on IP station

protons

Proton beam

72 MeV

50 microA

Production of high specific activity and purity

radionuclides for intended medical

applications (e.g. Scandium 44)

Isotope Production Station for Radionuclides

Radionuclide Development at PSI: Sc-44

Chemical Separation and Processing

Target Preparation & Encapsulation

Target dimensions:

6 mm diameter, 0.5 mm thick

Target Loading into Irradiation Station

Target Irradiation with Protons

(p,n) Nuclear Reaction

Radiolabelling and Imaging

Testing and Manipulation of Dummy Target

After irradiation Target has to be

remotely handled, so the housing must be

“easily” mounted/dismounted

IP2 Geometry 2016: CATIA explosion with Niobium degraders (Nb)

Nb degraders

The power deposited by the proton beam will be quite high so the experiment

must be sufficiently well cooled!

Proton beam

direction

72 MeV

50 microA

IP2 Geometry 2016: cutting plane

Outlet (top)

Inlet (bottom)

water channels

Outlet (top)

Inlet (bottom) Ta

rge

t

Degraders

IP2 Geometry: 3D

Magenta thermocouples

with insertions

Green capsule

All the rest are water

channels

Outlet (top)

Inlet (bottom)

For this configuration

and a proton current of 50 microA

max. power density at

thermocouple positions

( before degraders )

can reach around 12.5 [W / mm3]

The geometry of the

flow channels

spans from really

small channels (0.1 mm width)

to relatively large channels

(16.4 mm width)

with complicated geometry

and flow structures

Figure left: flow streamlines.

Figure right: mesh.

CADFEM support really valuable in building the complicated mesh !!!

Major difficulties of CFD simulations

Inlet

Outlet Outlet

Inlet

Targ

et

BL with 0.028 mm thickness

Examples of mesh size for boundary layers (BL)

On average total

mesh statistics:

23’101’411 elements

Hybrid mesh

Tetrahedrons

(12’181’962)

Prisms (9’734’791)

Hexahedrons

(1’159’678)

Pyramids (24’980)

Boundary layers with

7 nodes

perpendicular to the

wall and growth rate

of max. 1.3

BL with 0.19 mm thickness

Goal of the study Geometry: cut at middle plane (y = 0)

Our main goal

during this simulation

campaign was to assure

that the flow is

well distributed

throughout the

channels.

At this stage NO POWER

DEPOSITION.

Outlet (top)

Inlet (bottom)

Targ

et

• Steady-state flow simulations

• 2 bar operating pressure

•0.1 Kg/s at inlet

•Water as coolant fluid

•CFX with SST turbulent model with Automatic wall

functions

Simulation settings

Results: cutting planes for velocity contour plots (top view)

Perpendicular cutting plane at 0 mm on the Z axis

Inlet

Outlet

Z axis

Beam direction

Targ

et

plane at 0 mm in Z direction

Results: velocity contour plots

Z axis and main flow directions

perpendicular to the figure

outwards of the plane

Beam direction


Perpendicular cutting plane at +5 mm on the Z axis

Perpendicular cutting plane at -5 mm on the Z axis

Inlet

Outlet

Z axis

Beam direction

Targ

et

plane at -5 mm in Z direction plane at +5 mm in Z direction




outwards of the plane

Beam direction




Inlet

Outlet

Z axis

Beam direction

Targ

et



max velocity (see next slide)



outwards of the plane Beam direction

Results: velocity streamlines

max velocity

Inlet

Outlet

Z axis

Targ

et

Beam direction




Inlet

Outlet

Z axis

Beam direction

Targ

et





outwards of the plane Beam direction

Results: pressure drops chamber with thermocouple inserts

Cut on plane Y=0

pressure contour plot

P1

P2

P1

P2

P3

P4

P3

P4

Inlet

Outlet

Pressure loss from P1 to P4 ~ 40%

Targ

et

Results: pressure drop back channel

Cut on plane Y=0

pressure contour plot

P1

P1

P2

P3 P4

P5 P6

P7 P8

P2

P3

P4

P5

P6

P7 P8

Inlet

Outlet

Pressure loss from P1 to P8 ~ 36%

Targ

et

Wir schaffen Wissen – heute für morgen

Summary : 2016 simulations show relatively uniform flow distribution

across the water channels in IP2 2016 geometry

… so that capsule, degraders and thermocouples with insertions should be

sufficiently well cooled but upgrade is possible in future designs.

Next step is re-do the flow study for the updated IP2 2019 geometry

without power deposition and later to introduce the power deposition

Raffaello Sobbia (Group 8142):: Stefan Joray (Group …...Raffaello Sobbia (Group 8142):: Stefan...

Documents

Transcript of Raffaello Sobbia (Group 8142):: Stefan Joray (Group …...Raffaello Sobbia (Group 8142):: Stefan...