Numerical model for thermal hydraulic analysis in cable-in-conduit-conductors

The issue of quench is related to safety operation of large-scale supercond ucting magnet system fabricated by cable-in-conduit conductor. A numerical method is presented to simulate the thermal hydraulic quench characteristic s in the superconducting Tokamak magnet system. One-dimensional fluid dynam ic equations for supercritical helium and the equation of heat conduction f or the conduit are used to describe the thermal hydraulic characteristics i n the cable-in-conduit conductor. The high heat transfer approximation betw een supercritical helium and superconducting strands is taken into account due to strong heating induced flow of super-critical helium. The fully impl icit time integration of upwind scheme for finite volume method is utilized to discretize the equations on the staggered mesh. The scheme of a new ada ptive mesh is proposed for the moving boundary problem and the time term is discretized by the-implicit scheme. It remarkably reduces the CPU time by local linearization of coefficient and the compressible storage of the larg e sparse matrix of discretized equations. The discretized equations are sol ved by the IMSL. The numerical implement is discussed in detail. The valida tion of this method is demonstrated by comparison of the numerical results with those of the SARUMAN and the QUENCHER and experimental measurements.