Article(id=1157001741725159660, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1157001740768858346, articleNumber=null, orderNo=null, doi=10.19562/j.chinasae.qcgc.2024.07.017, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1700928000000, receivedDateStr=2023-11-26, revisedDate=1705593600000, revisedDateStr=2024-01-19, acceptedDate=null, acceptedDateStr=null, onlineDate=1753780311279, onlineDateStr=2025-07-29, pubDate=1721836800000, pubDateStr=2024-07-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1753780311279, onlineIssueDateStr=2025-07-29, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1753780311279, creator=13701087609, updateTime=1753780311279, updator=13701087609, issue=Issue{id=1157001740768858346, tenantId=1146029695717560320, journalId=1146120084050784272, year='2024', volume='46', issue='7', pageStart='1137', pageEnd='1334', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=0, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1753780311052, creator=13701087609, updateTime=1756792480363, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1169635694612853253, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1157001740768858346, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1169635694612853254, tenantId=1146029695717560320, journalId=1146120084050784272, issueId=1157001740768858346, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1302, endPage=1313, ext={EN=ArticleExt(id=1157001742199116020, articleId=1157001741725159660, tenantId=1146029695717560320, journalId=1146120084050784272, language=EN, title=A High Time-Resolution Reconstruction on the Automotive Turbulent Wake Based on LSTM-POD, columnId=null, journalTitle=Automotive Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=
A deep-learning LSTM-based POD model (LSTM-POD) based on long short-term memory (LSTM) and proper orthogonal decomposition (POD) is developed for the turbulent wake of the square-back Ahmed automotive general model. A high time-resolution reconstruction is achieved by establishing the mapping relationship between the POD modal coefficients of the non-time-resolved planar velocity field and the time-resolved velocity signals at a number of discrete points, and the effect of different time-step configurations, i.e., the single time step (LSTM-Sin) and multiple time steps (LSTM-Mul) on the reconstruction results is compared. The results show that the LSTM-POD model has strong learning and generalization ability in time series reconstruction, In addition, LSTM-Mul considers temporal continuity and correlation, the reconstructed mode coefficients (lower order) and velocity fields of which are more consistent with the POD reconstructed results compared with that of LSTM-Sin. The deep learning model proposed in this study can alleviate the problems of high resource consumption and low computational efficiency in obtaining high time resolution flow field data through experiments and high-precision numerical simulation.
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本文针对方背Ahmed汽车标模的湍流尾迹,建立基于长短时记忆法(long short-term memory,LSTM)和本征正交分解(proper orthogonal decomposition, POD)相结合的深度学习模型LSTM-POD。通过建立非时间分辨平面速度场POD模态系数和若干离散点的时间分辨速度信号的映射关系,实现了方背Ahmed汽车标模湍流尾迹流场的高时间分辨率重构,并对比了不同时间步长配置,即单时间步长(LSTM-Sin)和多时间步长(LSTM-Mul)对重构效果的影响。研究表明:LSTM-POD模型在时间序列重构中具有较强的学习和泛化能力。另外,LSTM-Mul考虑到了时间上的连续性和相关性,相较于LSTM-Sin,其重构出的低阶模态系数和速度场与POD的重构结果更吻合。本研究提出的深度学习模型可以缓解通过实验及高精度数值模拟获取高时间分辨率流场数据资源消耗大、计算效率低等问题。
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| 网络层 | 输出维度 |
| 输入 | (1, 12) |
| 1st LSTM | (1, 128) |
| 1st BatchNormalization | (1, 128) |
| 2nd LSTM | (1, 64) |
| 2nd BatchNormalization | (1, 64) |
| 输出: 3rd LSTM | (1, 20) |
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LSTM网络结构(单时间步长)
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| 网络层 | 输出维度 |
| 输入 | (1, 12) |
| 1st LSTM | (1, 128) |
| 1st BatchNormalization | (1, 128) |
| 2nd LSTM | (1, 64) |
| 2nd BatchNormalization | (1, 64) |
| 输出: 3rd LSTM | (1, 20) |
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| 网络层 | 输出维度 |
| 输入 | (5, 12) |
| 1st LSTM | (5, 128) |
| 1st BatchNormalization | (5, 128) |
| 2nd LSTM | (5, 64) |
| 2nd BatchNormalization | (5, 64) |
| 输出: 3rd LSTM | (5, 20) |
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LSTM网络结构(多时间步长)
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| 网络层 | 输出维度 |
| 输入 | (5, 12) |
| 1st LSTM | (5, 128) |
| 1st BatchNormalization | (5, 128) |
| 2nd LSTM | (5, 64) |
| 2nd BatchNormalization | (5, 64) |
| 输出: 3rd LSTM | (5, 20) |
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| 方法 | C d | C b | L r |
| LES数值计算 | 0.328 | 0.221 | 1.39 |
| 实验[20] | 0.320 | 0.220 | 1.50 |
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LES数值计算方法与实验结果对比
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| 方法 | C d | C b | L r |
| LES数值计算 | 0.328 | 0.221 | 1.39 |
| 实验[20] | 0.320 | 0.220 | 1.50 |
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| POD 系数 | LSTM-Sin | LSTM-Mul |
| Modes1-20 | 0.005 52 | 0.001 17 |
| Modes21-40 | 0.007 00 | 0.001 74 |
| Modes41-60 | 0.007 65 | 0.002 06 |
| Modes61-80 | 0.008 85 | 0.002 39 |
| Modes81-100 | 0.008 95 | 0.002 60 |
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| POD 系数 | LSTM-Sin | LSTM-Mul |
| Modes1-20 | 0.005 52 | 0.001 17 |
| Modes21-40 | 0.007 00 | 0.001 74 |
| Modes41-60 | 0.007 65 | 0.002 06 |
| Modes61-80 | 0.008 85 | 0.002 39 |
| Modes81-100 | 0.008 95 | 0.002 60 |
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