| 摘要 |
PURPOSE:To accurately determine presence or absence of quenching of a coil by drawing a condition that an error mode of a numeric value solution is not amplified even if a timing step is advanced as a method of simultaneously satisfying a fluid equation and a heat conduction equation, and obtaining temperature distribution of a conductor in spatial and timing manner, and setting a timing division according to it. CONSTITUTION:A sufficient condition that an error mode of a numeric value solution is not amplified even if a timing step is advanced is drawn, and whether a superconducting breakdown occurs or not is determined according to this when a coil is thermally disturbed. Thus, condition that Fourier mode of an error is not amplified in each timing step of a calculating process, i.e., t<= tmax* (<=tmax) is analytically obtained, a timing division is given by t=alpha tmax* (0<alpha<1) to eliminate a numerical instability, thereby performing determination of high accuracy and high reliability. That is, temperature distribution is calculated by four simultaneous equations of a mass conservation rule, a momentum conservation rule, an energy conservation rule and a thermal conduction equation. |
