CONSEN

Associazione EURATOM ENEA sulla FUSIONE

CONSENA COMPUTER PROGRAM FOR TRANSIENT SIMULATION

OF ENERGY AND MASS TRANSFER BETWEEN INTERCONNECTED VOLUMES

• DEVELOPED FOR A PERSONAL COMPUTER• A CENTRAL VOLUME plus N VOLUMES CONNECTED• MULTI-FLUIDS SIMULATION• CRYOGENIC CONDITIONS• ICE FORMATION • INTERNAL AND BOUNDARY STRUCTURES• JUNCTIONS AND VALVES • FIXED CONDITIONS VOLUMES• INTERNAL AND EXTERNAL HEAT TRANSFER• RADIATION BETWEEN STRUCTURES• CRITICAL FLOW• CHEMICAL REACTIONS• AUTOMATIC TIME STEP CONTROL• ON-LINE INFORMATION DURING CALCULATIONS

2Associazione EURATOM ENEA sulla FUSIONE

LIQUID

VAPOUR/GAS

STRUCTURE

FLOW RATE

HEAT

FIXEDCONDITION

VOLUME

interfacial mass exchange

flashing

volume i

from volume i-1

to volume i+1

• WATER (0.1 - 1500 K)• HELIUM (2.2 - 1500 K)• OXYGEN (T > 54.4 K)• NITROGEN (T > 0.1 K)• HYDROGEN (GAS)• AIR • OTHER GAS

• NATURAL CONVECTION• BOILING• CONSENSATION• JET IMPINGEMENT

HEAT TRANSFER• ICE FORMATION• DIFFUSION AT THE

LIQUID/ATMOSPHERE INTERFACE

• USER DEFINED HTC


JUNCTIONS SIMULATIONJUNCTIONS SIMULATION• SIMPLE CONNECTION,

VALVE OR BREAK SIMULATION

• FLOW AREA vs TIME• FLOW RATE vs TIME or p• ACTUATION TIME• ACTUATION P OR T• CHECK VALVEP COEFFICIENT vs TIME

CRITICAL FLOWCRITICAL FLOW• GAS• HIGH SUBCOOLING• FLASHING (LOW SUB.)• TWO PHASE (H.M.)

STRUCTURES SIMULATIONSTRUCTURES SIMULATION• FINITE DIFF. IMPLICIT METHOD

(FOURIER EQ. 1-D, 2_D for target) • INTERNAL POWER SOURCE• DIFFERENT GEOMETRY: SLAB,

CYLINDER, SPHERE• MULTILAYER STRUCTURES• INTERNAL STRUCTURES• BOUNDARY STRUCTURES

STRUCTURE MATERIALSSTRUCTURE MATERIALS• CONCRETE• CARBON STEEL• STAINLESS STEEL• COPPER• GRAPHITE• BERYLLIUM• TUNGSTEN• INSULANTS• SUPERCONDUCTORS• INPUT DEFINED MATERIALS

• BERYLLIUM-STEAM• BERYLLIUM-AIR • GRAPHITE-STEAM• GRAPHITE-AIR • TUNGSTEN-STEAM• TUNGSTEN-AIR

CHEMICAL REACTIONSCHEMICAL REACTIONS


NODALIZATION - The version 5.0 has been developed to allow the model of several compartments connected according to a free topology defined by the user, so that all the compartments can be connected, through junctions, to all the other volumes.

CONSEN v 5.0CONSEN v 5.0

4

1

9*

6

5

3

2

ATMOSPHERE

PF He loopPSS

AIR ROOM

VVPHTS

VV CRYOSTAT

J-1

J-2

J-15J-12

J-7

J-6 J-11

J-18

* Fixed condition volume

MAGNET INDUCEDCONFINEMENT BYPASS

ACCIDENT

CONSEN 5 MODEL

This overcomes the limitation of the previous versions of the code in which a maximum of six volumes could be connected only to a "central" compartment.

CONSEN 5 nodalization example


TRITIUM - A simple model to evaluate tritium migration between the compartments has been implemented too in CONSEN 5.0. The tritium flow between two connected volumes is evaluated multiplying the tritium volumetric concentration in the compartment (assumed uniform only in the atmosphere region) and the volumetric flow rate evaluated by the existing models in CONSEN.

ICE - A model to evaluate ice porosity during formation and its influence on density and thermal conductivity has been implemented. Some modification in the iterative algorithms for the ice thickness evaluation has been introduced.

In CONSEN all the tritium is considered in HTO form diluted in the steam and in the atmosphere. It is treated ,at the present, as a gas (it does not condense on cold surfaces).

CONSEN

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