在GAMER中實現宇宙射線

Abstract

我們擴展了GAMER-2的功能，以支持宇宙射線之物理，其中包括單一能量通道、平流、非等向性擴散以及與熱氣體的動態耦合。我們將寫好的程式用下面的測試問題：聲波、震波管以及數個非等向性擴散測試來檢驗程式的準確性。這些測試的結果都有二階精確。除此之外，我們也讓宇宙射線的計算支援GAMER-2的進階功能，其中包括自適應網格、混合的OpenMP/MPI平行以及圖形顯示卡(GPU)的平行加速。在未來，我們預計再未來增加更多宇宙射線的物理像是多能量通道、宇宙射線流以及宇宙射線熱效應。

We extend GAMER-2 to support cosmic rays with a single energy channel, advection, anisotropic diffusion, and dynamical coupling to thermal gas. To verify the accuracy, we conduct a series of numerical experiments, including acoustic wave, shock-tube problem, and several anisotropic diffusion tests. All tests achieve second-order accuracy. Furthermore, our extension inherits the advanced features of GAMER-2, including adaptive mesh refinement, hybrid OpenMP/MPI parallelization, and graphics processing unit (GPU) acceleration. We are planning to implement multiple energy channels, cosmic rays streaming, and heating.