Efficient Preconditioning of Linear Systems Arising from the Discretization of Radiative Transfer Equation
Preconditioning techniques for iterative solvers of discretized radiative transfer equation are presented. Discrete ordinates collocation and Diamond differencing are used for angle and space discretizations respectively. To solve the resulting linear system we formulate source iteration, diffusion synthetic acceleration and Krylov subspace methods. We also introduce a fast multilevel algorithm. All these methods can be viewed as preconditioned iterative methods with different preconditioners. Numerical results along with comparisons of effectiveness and efficiency of these solvers are carried out on several test problems with both continuous and discontinuous variables.
KeywordsRadiative Transfer Krylov Subspace Coarse Level Radiative Transfer Equation Krylov Subspace Method
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