Numericalcal culation of early fireball radiation spectrum in strong explosion
- 1. Northwest Institute of Nuclear Technology, Xi’an 710024, Shaanxi, China
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Abstract: On the basis of multi-group radiation hydrodynamics method of fireball radiation in strong explosion, operator splitting method is used to split the equations into convection items and source items, which are split into radiation groups due to the equation formation and solved individually. Numerical calculations show that the method used here overcomes strong instability when solving the equations directly because of the coupling items between radiation and fluid. In the meantime, the time step in the calculation is increased obviously. Fireball radiation spectrum is obtained in fine accordance with the result in the literature.