Intelligent prediction method of flow field and aerodynamic characteristics for two-dimensional blunt body combined sections in steady wind

LI Ke; WANG Lulu; CHEN Zengshun; ZHAO Wenzhuo; QIN Yu; LI Shaopeng

doi:10.7638/kqdlxxb-2025.0036

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Intelligent prediction method of flow field and aerodynamic characteristics for two-dimensional blunt body combined sections in steady wind

更新时间：2026-05-28

- Intelligent prediction method of flow field and aerodynamic characteristics for two-dimensional blunt body combined sections in steady wind
- Vol. 43, Issue 5, Pages: 112-123(2025)
- 作者机构：
  
  重庆大学土木工程学院,重庆,400045
- 作者简介：
- 基金信息：
- DOI：10.7638/kqdlxxb-2025.0036
  CLC： TU312.1;V211.3;TP183
- Published：2025
- 稿件说明：
移动端阅览
李珂, 王路路, 陈增顺, 等. 定常来流下钝体二维组合断面气动特性与流场的智能预测方法[J]. 空气动力学学报, 2025, 43(5): 112−123.

LI Ke, WANG Lulu, CHEN Zengshun, et al. Intelligent prediction method of flow field and aerodynamic characteristics for two-dimensional blunt body combined sections in steady wind[J]. 2025, 43(5): 112-123.
李珂, 王路路, 陈增顺, 等. 定常来流下钝体二维组合断面气动特性与流场的智能预测方法[J]. 空气动力学学报, 2025, 43(5): 112−123. DOI： 10.7638/kqdlxxb-2025.0036

LI Ke, WANG Lulu, CHEN Zengshun, et al. Intelligent prediction method of flow field and aerodynamic characteristics for two-dimensional blunt body combined sections in steady wind[J]. 2025, 43(5): 112-123. DOI： 10.7638/kqdlxxb-2025.0036.

摘要

结构断面气动性能的高效精准获取对于设计优化至关重要。特别是在处理结构断面设计参数多样性和优化方向不确定性的迭代计算任务时，为了解决效率低下的问题，本文提出一种基于深度学习代理模型的智能预测方法，对定常风下钝体二维组合断面的绕流流场及三分力系数进行快速精准预测。具体而言，该方法采用类似图片的一致化形状表达来描述钝体组合断面的气动外形，具有不受断面形式限制的通用性；通过融合卷积注意力机制模块与残差模块构建神经网络架构，并利用均方误差来捕捉神经网络预测误差，实现了从气动外形到绕流流场及三分力系数的强非线性映射。研究结果表明，该方法在定常风条件下，对钝体二维组合断面的时均绕流流场、表面压力分布以及三分力系数的预测误差分别控制在3.7%、0.35%和6.25%以内，满足精度要求，且与传统CFD模拟计算相比，计算效率提升了4个数量级。该方法为定常风下钝体断面气动性能的快速预测提供了一种高效、实用的技术手段。

Abstract

In the design and optimization of structural cross-sections

the efficient and accurate evaluation of aerodynamic performance is of significant importance. To address the inefficiency in iterative computations involving diverse design parameters‌

this study proposed an intelligent prediction method based on a deep learning surrogate model

focusing on the rapid and accurate prediction of flow fields around two-dimensional combined bluff body cross-sections and static force coefficients under steady wind conditions. Specifically

this method employed a unified image-like shape representation to characterize the aerodynamic shapes of bluff body combined cross-sections

ensuring broad applicability without being limited by specific cross-section configurations. By integrating convolutional attention mechanisms and residual modules to construct the neural network architecture and using mean squared error to capture prediction errors

the method achieved a highly nonlinear mapping from aerodynamic shapes to flow characteristics and static force coefficients. The model achieves prediction errors within ‌3.7% for velocity fields‌

‌0.35% for surface pressure‌

and ‌6.25% for force coefficients‌ under steady wind

meeting all accuracy requirements. Additionally

the computational efficiency was improved by four orders of magnitude compared to conventional CFD. This method provides an efficient and practical solution for the rapid prediction of aerodynamic performance for bluff body cross-sections under steady wind environments.

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