用CRK-HACC模拟宇宙学中的流体力学
Simulating Hydrodynamics in Cosmology with CRK-HACC
摘要：
我们引入CRK-HACC，硬件/混合加速宇宙学代码（HACC）的扩展，解决气体流体动力学在宇宙的大尺度结构形成模拟。新的框架耦合HACC引力N体求解器与现代平滑粒子流体动力学（SPH）方法称为CRKSPH。产生$\underline{\text{K}}$内核$\underline{\text{SPH}}$的$\underline{\text{C}}$利用平滑函数，精确地插值线性场，同时明显地保持守恒定律（动量，质量和能量）。CRKSPH方法已被纳入到宇宙学模拟中精确建模重子效应-这是一个重要的补充，旨在为即将到来的观测调查生成精确的合成天空预测。CRK-HACC继承了HACC求解器的协同设计策略，并被构建为在现代GPU加速的超级计算机上运行。在这项工作中，我们总结了主要的求解器组件，并提出了一些标准的验证测试，以证明代码的准确性，包括理想化的流体动力学和宇宙学设置，以及自相似性测量。
英文摘要：
We introduce CRK-HACC, an extension of the Hardware/Hybrid Accelerated Cosmology Code (HACC), to resolve gas hydrodynamics in large-scale structure formation simulations of the universe. The new framework couples the HACC gravitational N-body solver with a modern smoothed particle hydrodynamics (SPH) approach called CRKSPH. $\underline{\text{C}}$onservative $\underline{\text{R}}$eproducing $\underline{\text{K}}$ernel $\underline{\text{SPH}}$ utilizes smoothing functions that exactly interpolate linear fields while manifestly preserving conservation laws (momentum, mass, and energy). The CRKSPH method has been incorporated to accurately model baryonic effects in cosmology simulations - an important addition targeting the generation of precise synthetic sky predictions for upcoming observational surveys. CRK-HACC inherits the codesign strategies of the HACC solver and is built to run on modern GPU-accelerated supercomputers. In this work, we summarize the primary solver components and present a number of standard validation tests to demonstrate code accuracy, including idealized hydrodynamic and cosmological setups, as well as self-similarity measurements.
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