<b>18th OpenFOAM Workshop 2023 - </b><b>Validation Challenge</b>

<b>18th OpenFOAM Workshop 2023 - </b><b>Validation Challenge</b><b>Genoa, Italy. 11-14 July, 2023.</b><br>For the first time, a validation challenge will be organized during the workshop. The main goal of this validation challenge is to<b> evaluate the performance of OpenFOAM as a numerical simulation tool</b> for addressing industrial problems and identify areas needing additional research and development in OpenFOAM. We invite the whole community to<b> participate in this benchmarking case</b>. Participants are invited to use different turbulence models, meshes, numerical methods, CFD solvers, etc.<b>Objectives:</b>To assess the state-of-the-art of turbulence modeling capabilities in OpenFOAM.To assess the state-of-the-art of moving meshes capabilities in OpenFOAM.To assess the state-of-the-art of the computational methods implemented in OpenFOAM as practical tools for predicting the performance of industry-relevant geometries.To define best standard practices for turbulence models in OpenFOAM.To identify areas needing additional research and development in OpenFOAM.To compare OpenFOAM performance against different CFD solvers.To provide an impartial forum for evaluating the effectiveness of existing computer codes and modeling techniques using Navier-Stokes solve<b>On the validation challenge – Executive summary:</b><br><b>FDA’s “Critical Path” Computational Fluid Dynamics (CFD)/Blood Damage Project.</b>Validation of CFD modeling is essential to demonstrate the credibility of simulation results. To provide a benchmark data set for CFD validation, researchers at the U.S. Food and Drug Administration (FDA) and collaborators designed a geometrically simple centrifugal blood pump and performed experiments to characterize the hydrodynamic performance of the device. The pump consists of a centered rotor with four equally spaced blades, a housing, and an outlet diffuser. Interlaboratory experiments were conducted in three labs using a Newtonian blood analog fluid. The pressure head was characterized and particle image velocimetry (PIV) measurements of the velocity field were acquired in several different locations in the pump, both within the rotor region and the outlet diffuser. Experiments were performed at six pump conditions that span the device operating range. To facilitate CFD validation, the 3D computer-aided design (CAD) files of the pump geometry, the fluid properties and inlet conditions, and all experimental measurements are publicly available at https://nciphub.org/wiki/FDA_CFD/ComputationalRoundRobin2Pump.<b>General Information:</b>This validation challenge is open to participants worldwide. Everyone is welcome.No separate registration fee will be required for attendance. But you must be registered to attend the OpenFOAM workshop.Participants can use any CFD solver. Participation is not only limited to OpenFOAM.Results will be made available after the workshop in a report and on the workshop website.This validation challenge is very demanding from the turbulence modeling point of view as the following scenarios are present: flow separation and reattachment, recirculation zones, stagnation point anomaly, impinging flows, highly anisotropic flows, system rotation, and sudden contraction and expansion.<br>More information is available at the following link: https://openfoamworkshop.org/validation-challenge/<b>In this repository, you can find all the results and meshes shared by the community.</b><br>

**2023年第18届OpenFOAM研讨会——验证挑战赛** 意大利热那亚，2023年7月11日至14日

本次研讨会首次举办验证挑战赛。本次验证挑战赛的核心目标是评估OpenFOAM作为数值模拟工具解决工业问题的性能，并明确OpenFOAM中有待进一步研发的领域。我们邀请全体社区成员参与本次基准测试案例。参赛选手可使用不同的湍流模型、网格、数值方法、计算流体动力学（Computational Fluid Dynamics, CFD）求解器等。

**目标：**
1. 评估OpenFOAM中湍流建模能力的当前技术水平
2. 评估OpenFOAM中动网格技术能力的当前水平
3. 评估OpenFOAM中已实现的计算方法作为预测工业相关几何结构性能的实用工具的当前技术水平
4. 制定OpenFOAM中湍流模型的最佳标准实践规范
5. 明确OpenFOAM中有待进一步研发的领域
6. 对比OpenFOAM与其他CFD求解器的性能表现
7. 搭建公正的交流平台，以评估基于纳维-斯托克斯方程求解的现有计算机代码与建模技术的有效性

**关于本次验证挑战赛——执行摘要：美国食品药品监督管理局（U.S. Food and Drug Administration, FDA）"关键路径"计算流体动力学（Computational Fluid Dynamics, CFD）/血液损伤项目**
CFD建模的验证工作是证明模拟结果可信度的核心前提。为提供用于CFD验证的基准数据集，美国FDA的研究人员与合作方设计了一款几何结构简洁的离心式血泵，并开展实验以表征该装置的流体动力性能。该血泵由带四片等间距叶片的中心转子、泵壳与出口扩压器组成。三家实验室使用牛顿型血液模拟流体开展了实验室间比对实验，对压头进行了表征，并在泵内转子区域与出口扩压器的多个不同位置获取了速度场的粒子图像测速技术（Particle Image Velocimetry, PIV）测量数据。实验覆盖了该装置运行范围内的6种泵工况。为方便CFD验证工作，该泵几何结构的三维计算机辅助设计（Computer-Aided Design, CAD）文件、流体属性与入口条件，以及全部实验测量数据均可通过以下公开链接获取：https://nciphub.org/wiki/FDA_CFD/ComputationalRoundRobin2Pump

**通用信息：**
本次验证挑战赛面向全球所有参与者开放，欢迎所有人报名。参会无需额外缴纳注册费，但需完成OpenFOAM研讨会的注册。参赛选手可使用任意CFD求解器，参赛范围不限于OpenFOAM。所有结果将在研讨会结束后以报告形式及研讨会官网发布。
从湍流建模的角度来看，本次验证挑战赛具有较高难度，因为其中涵盖了以下流动场景：流动分离与再附、回流区、驻点异常、冲击流、高度各向异性流动、系统旋转以及突缩与突扩。

更多信息可通过以下链接获取：https://openfoamworkshop.org/validation-challenge/
本仓库中包含社区共享的全部参赛结果与网格文件。

搜集汇总

背景与挑战

背景概述

该数据集来自第18届OpenFOAM研讨会2023年的验证挑战，旨在评估OpenFOAM在工业问题中的数值模拟性能，并识别其研究开发需求。数据集包含社区共享的多个网格文件和演示案例，基于FDA离心血泵实验，用于湍流建模和计算流体动力学的基准测试，覆盖生物流体和计算流体动力学领域。