Data for: Parametric Aerodynamic Study of a 3D Printed Cycloidal Rotor Prototype Designed for the Best Figure of Merit

This repository releases the 284 million cell case shortly described in the aforementioned paper and consists of a DDES CFD simulation of a cycloidal rotor which was scaled to test the limits of the OpenFOAM software when simulating rotating machinery. The intent is to provide the community a publicly available testcase to favor further improvements to the OpenFOAM code, especially in terms of HPC scalability. A short user manual is given in the 00_README.md file. The other files are as follow (switch from table to tree view if you want to see the files sorted into folders): 01_ReadyToRunCase.tar: this file allows any user to restart the simulation where it was stopped without necessarily having to decompose the domain or proceed to any preprocessing step 02_needed_OF_libs-v2206.tar.bz2: these OpenFOAM librairies are needed to run the test case; tested on v2206, but will likely work with other versions as well 03_generator.tar: files and scripts to build the case from zero 04_fullBlade0.pw: this is the original blade mesh from Pointwise and can be used to reconstruct the case using the 03_generator.tar archive and running the given scripts 04_halfBlade0.pw: this is the original HALF blade mesh from Pointwise and can be used, for exemple, to modify the blade mesh before rerunning the case with a different grid resolution 05_fullBlade0.gg: mesh exported into gridgen format 05_fullBlade0_struct.cgns: blade exported into structured cgns format 05_fullblade0_unstruct.cgns: blade exported into unstructured cgns format 05_fullblade0_withDatabases.gg: blade exported into gridgen format and keeping the blade surface database Each tar archive is accompanied by a .tar.list file giving a quickly accessible archive content. The simulated rotor has 4 blades, a radius of 84.25 mm and turns at 1695 RPM. The maximum pitch angles of the upper and lower paths are 35° and 38°, respectively, and they occur at position 100° and 277°, respectively. Simulation setups of the same rotor using lower cell counts varying between 12 to 24 million cells and being defined according to the praxis for URANS simulation are available in the following repository: https://doi.org/10.18419/darus-2812 The case is ran using OpenFOAM (pimpleFoam) on the HLRS-Hawk supercomputer. A thorougher description of the case is available in the upcoming paper which was submitted to the Journal of the American Helicopter Society, request preprint here: https://www.researchgate.net/publication/369473318_Parametric_Aerodynamic_Study_of_a_3D_Printed_Cycloidal_Rotor_Prototype_Designed_for_the_Best_Figure_of_Merit Videos of the simulation are available for: blade surface pressure: https://youtu.be/jJQBeXSGawI wake vorticity: https://youtu.be/_vl5uO_mVVo

本仓库发布了前文所述论文中简要介绍的2.84亿网格单元算例，该算例为延迟分离涡模拟（Delayed Detached Eddy Simulation, DDES）计算流体动力学（Computational Fluid Dynamics, CFD）仿真，针对摆线转子开展，用于测试OpenFOAM软件在旋转机械仿真场景下的性能极限。

本项目旨在为学术社区提供一套公开可用的测试算例，以推动OpenFOAM代码的进一步优化，尤其聚焦于高性能计算（High Performance Computing, HPC）可扩展性方向。

00_README.md文件中包含简要用户手册。其余文件结构如下（若需查看按文件夹分类的文件列表，可切换至树状视图）：

01_ReadyToRunCase.tar：该文件支持用户直接从仿真中断处重启计算，无需对计算域进行分解或执行任何预处理步骤。
02_needed_OF_libs-v2206.tar.bz2：运行该测试算例所需的OpenFOAM库文件，已在v2206版本中完成测试，理论上兼容其他版本。
03_generator.tar：包含从零构建该算例所需的文件与脚本。
04_fullBlade0.pw：源自Pointwise的原始叶片网格，可结合03_generator.tar归档文件与配套脚本用于重构该算例。
04_halfBlade0.pw：源自Pointwise的原始半叶片网格，可用于例如以不同网格分辨率重新运行算例前修改叶片网格。
05_fullBlade0.gg：导出为Gridgen格式的叶片网格。
05_fullBlade0_struct.cgns：导出为结构化CGNS格式的叶片网格。
05_fullblade0_unstruct.cgns：导出为非结构化CGNS格式的叶片网格。
05_fullblade0_withDatabases.gg：保留叶片表面数据库的Gridgen格式叶片网格。

每个tar归档文件均附带一个.tar.list文件，可快速查看归档内的文件列表。

本次仿真的转子包含4片叶片，半径为84.25 mm，转速为1695转每分钟（Revolutions Per Minute, RPM）。上下流道的最大俯仰角分别为35°与38°，对应的出现位置分别为100°与277°。

采用更低网格单元数（1200万至2400万）、且基于非定常雷诺平均Navier-Stokes（Unsteady Reynolds-Averaged Navier-Stokes, URANS）仿真规范构建的同款转子仿真设置，可在以下仓库获取：https://doi.org/10.18419/darus-2812

本算例依托HLRS-Hawk超级计算机，使用OpenFOAM的pimpleFoam求解器运行。该算例的详细描述已提交至《美国直升机学会期刊》，预印本可通过以下链接获取：https://www.researchgate.net/publication/369473318_Parametric_Aerodynamic_Study_of_a_3D_Printed_Cycloidal_Rotor_Prototype_Designed_for_the_Best_Figure_of_Merit

仿真可视化视频包含以下两类：
- 叶片表面压力分布：https://youtu.be/jJQBeXSGawI
- 尾涡涡量场：https://youtu.be/_vl5uO_mVVo