SUMMARYIn this paper, a new approach for approximating energy flux of temperature diffusion equation on unstructured meshes is presented, which is based on different formulae of the finite point method with different accuracies. In addition, a new numerical formula for computing cell nodal temperature is given. Numerical experiments show the good performance and accuracy of our methods.
To solve radiation hydrodynamics problems efficiently, a well-designed iterative method is crucial. In practical applications, the conventional Picard iterative method is widely used due to its advantages, such as implementation simplicity and no Jacobian matrix computations. However, its convergence rate is very low. To address the "slow convergence" problem, we present an acceleration strategy based on simple iterative methods by the relaxation technique in this article, and construct a general iteration acceleration framework which unifies simple iterative methods with some second order iterative methods in form. By this acceleration strategy, we develop and analyze an improved iterative method for the nonlinear heat equation based on the characteristics of the finite volume schemes, and compare with the conventional Picard method. Numerical results indicate that, the improved iterative method is much faster than the conventional Picard method while retaining its main advantages, and the finer the computational grids become, the closer the convergence rate approaches to the second order. In addition, according to the guidance of the acceleration framework, it is easy to design novel iterative schemes for radiation heat conduction equations.
SUMMARYWe consider a five-point positive meshless collocation method for the numerical solutions of transport process described by hyperbolic conservation laws. This positive meshless method uses the five-point scheme approximation for derivatives, and an artificial dissipation term to ensure the positivity of coefficients. The numerical examples confirm the good performance of the present five-point positive meshless scheme.
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