Meltrate of basal ice shelves at difference inclination

Direct Numerical Simulation (DNS) was used to study the effect of sloping the ice-shelves on the dissolution/melt rate at the ice-ocean interface. The simulations were done on the HPC Raijin at NCI, Canberra over March 2015 to June 2017. Numerical experiments were carried out over a range of slope angle (5 degrees – 90 degrees) of the ice-shelves measured from the horizon. Turbulent flow field is simulated over the domain length of 1.8 m, (for slope angle greater than or equal to 50 degrees) and 20 m (for slope angle less than or equal to 20 degrees) respectively; the flow-field is laminar otherwise. A constant ambient temperature 2.3 degrees C and salinity 35 psu is maintained throughout the simulations.The DNS successfully resolved all possible turbulence length scales and relative contributions of diffusive and turbulent heat transfer into the ice wall is measured.Data available:Excel file Meltrate_vs_slopeangle_lam_turb.xlsx contains both simulated laminar and turbulent dissolution/melt rate as a function of slope angle along with their analytical values based on laminar and turbulent scaling theory respectively.

本研究采用直接数值模拟（Direct Numerical Simulation，DNS）方法，探究冰架倾斜对冰-海洋界面处溶解/融化速率的影响。模拟工作于2015年3月至2017年6月期间，在澳大利亚堪培拉国家计算中心（NCI）的超算平台Raijin上完成。数值实验覆盖了以水平面为基准测量的冰架坡度角区间（5°~90°）。针对不同坡度角，模拟采用差异化的计算域设置与流场假设：当坡度角≥50°时，计算域长度为1.8 m；当坡度角≤20°时，计算域长度为20 m；其余坡度角条件下流场为层流。所有模拟过程均维持恒定的环境温度2.3 ℃与盐度35 psu。本次直接数值模拟成功解析了全部可能的湍流长度尺度，并量化了扩散换热与湍流换热对冰壁的相对贡献。本次公开数据集包含Excel文件Meltrate_vs_slopeangle_lam_turb.xlsx，其中收录了层流与湍流条件下溶解/融化速率随坡度角的变化数据，同时附带了分别基于层流和湍流相似理论推导得到的解析解数值。