CFD simulation of an isothermal water flow in the EADF-target geometry in dynamical similarity (COULI experiment)
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Data
2001-07-17
Autori
Maciocco, Luca
Sorrentino, Luca
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Abstract
The results of the numerical simulation of an isothermal water-flow in a geometry typical of the spallation target of the Energy Amplifier Demonstration Facility (EADF) are presented, and compared with the experimental results obtained at CEA-Cadarache (COULI experiment). All the calculations were performed with the Star-CD finite-volume commercial code. Basically, a 2D axisymmetric model was adopted, although a full 3D simulation was carried out as well, as explained below. The Chen k-ε high-Reynolds model was used, joined with a Norris & Reynolds Two-Layer model for the simulation of the near-wall turbulence. The grid-independence of the solution has been verified, and the results obtained with two different convection schemes (QUICK and MARS) has been compared, in order to minimise numerical uncertainties. No appreciable differences were found in the results. Because of the fact that experimental measurements revealed a high non-axisymmetric and non stationary flow behaviour, the possible presence of instabilities intrinsic in the flow topology has been analysed through a full 3D simulation, obtained with the circumferential extrusion of the 2D model. The simulation yielded a steady solution, with results in perfect agreement with the 2D case. It is worth to notice that it was possible to obtain a converged solution in the 3D case only using the MARS scheme, while the QUICK scheme had numerical problems. In spite of the above-mentioned lack of axial symmetry in the experimental set-up, the comparison with computational results showed the capability of Star-CD to correctly simulate the main flow characteristics.
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Keywords
3D simulation , energy amplifier demonstration facility (EADF) , isothermal water-flow , CFD