The Accomplish Of Three-Dimension Radiation Fluid Dynamics Calculation For Laser-Target Coupling

The research on the interaction between the laser and the target is very important in inertial confinement fusion (ICF), and is the key issue of the indirect drive in laser fusion. About this research, many non-equilibrium phenomena need to be analyzed, including sophisticated physics processes such as the transmission and the absorption of laser, the motion of hydrodynamics, the heat flow of electronic conduction and the radiation transmission etc.. In order to describe and have a detail research on these processes, we must carry out the numerical simulation. There are only 2-D radiation hydrodynamics simulation codes in our country at present. To get more exact results, the 3-D radiation hydrodynamics simulation code should be developed. The present paper mainly focuses on study of a numerical method of Radiation Hydrodynamics through calculation of some physical models.The ray track in plasma is usually obtained by solving the three-dimension ray equations. We use a simple Runge-Kutta algorithm, and obtain satisfied results.Because the atomic process in plasma is non-equilibrium, we need solve thenon-equilibrium P_n equations for getting the X-ray radiation emission. There are plentiful studyabout the P_n equations all around the world. Here we use a simple inconspicuous Euleralgorithm and analyze the evident algorithm's feasibility.Because the 3-D plasma fluid motion is very complex and serious mesh distortion exists, we present a continuous transportation method for solving the 3-D three-temperature radiation hydrodynamics equations. This method uses the new mesh to control the monstrosity of mesh and make the calculation of transportation easier. For solving the energy equation, the iterative method is used usually which cannot avoid the short time step. So we use an analytic solution algorithm to solve the three-temperature energy equation, which makes the calculation much simpler.Using the method presented in the present paper, the cylindrical coordinate 3-D three-temperature radiation hydrodynamics code is established. To test the code, we simulate some 1-D 2-D and 3-D physics phenomena about the interaction between laser and the Au target. The calculated results show the validity of the method presented by this paper.