2025-06-14

On June 14th, the research group held a team-building activity aimed at bidding farewell to the graduating students and enhancing the team's cohesion at the same time.

This team-building activity was carefully planned and rich in content. At the beginning of the event, the members participated in an immersive live-action theater murder mystery game, engaging in team reasoning and competition among four camps, fully demonstrating their wisdom and spirit of collaboration. The evening dinner party was filled with a warm and lively atmosphere, interspersed with interactive games including those about teamwork and fun challenges, with laughter and joy never ceasing. At the end of the event, the graduates shared their unforgettable experiences in the team and expressed their gratitude. Everyone also presented them with graduation blessings and gifts. I also delivered a brief speech, thanking everyone for their hard work and expressing my beautiful expectations for the future development of the team.

This team-building activity not only relaxed both the body and mind but also strengthened the bonds among the members. The event concluded successfully with a group photo as a memento. The research group wishes the graduates a bright future!

2025-06-11

The citation count of "Web-oriented BIM 3D Viewing and Information Management" on China National Knowledge Infrastructure (CNKI) has reached 100 times.

BIM Server provides a solution for BIM to support construction life cycle. Currently , the structure of BIM Server is C/S, but gradually B/S also shows its advantages. The release of the HTML5 standard brings the WebCL technology which supports hardware graphics acceleration in browser and is one of a series of revolutionary Web technologies. Thereby the foundation is laidfor achieving Web-oriented BIM infomation management and 3D display of BIM model. In this paper, the model information scope and its expression of Web-oriented BIM is ana-lyzed, and the corresponding information management technology and the BIM model display based on the Three. js, which is a WebCL framework, are studied. Then, a WebCL-based platform for 3D display and information management of BIM is also developed. Application shows that the graphics platform of the platform performs stable with nice rendering for large BIM. Meanwhile the platform provides rich feature supports for Web client by favorable interactive functions, showing a great application value.

Journal of Information Technology in Civil Engineering and Architecture was founded in 2009. It is a national first-class journal sponsored by the China Graphics Society and under the supervision of the China Association for Science and Technology. Wang Hengwei is the first author of the paper. The other authors include Associate Researcher Lin Jiarui and Professor Zhang Jianping from the Department of Civil Engineering at Tsinghua University.

2025-05-24

The paper "Fluid flow and heat transfer characteristics of manifold microchannel heat sinks with ribs of different shapes" has been published in the Journal International Journal of Heat and Mass Transfer.

Manifold Microchannel Heat Sink (MCHS) is an effective device to dissipate the heat generated from the chips with large-scale circuits. Although it is found that adding ribs to the microchannels of the traditional MCHS improves its performance in heat dissipation, there is no systematic study to investigate the effect of adding ribs to the manifold MCHS. The pressure drops, mean temperatures, the Nusselt number, the heat enhancement efficiency, the characteristics of flows and heat transfers have been studied numerically in the manifold MCHS with five different shaped ribs and compared to the smooth manifold MCHS in this paper. The comparison shows that the development of boundary layers in the flow and temperature fields is interrupted by the ribs, which leads to an enhancement in heat dissipation. Compared to the smooth manifold MCHS, the ribs reduce the temperature of the substrate bottom by 9.2%-25.1% and the Nusselt numbers are increased by 11.5%-45.2%. However, the ribs in the microchannels increase the pressure drops by 55.7%-111.4%. As the Reynolds number increases, the influence of ribs on these key indicators becomes more pronounced. Through the computational analysis of the thermal enhancement efficiency, it is found that benefits of adding ribs overwhelms at higher Reynolds number (exceeds 200). The elliptical ribs are recommended among the different rib shapes under investigation and the heat enhancement efficiency achieves a maximum value of 1.17 when the Reynolds number is 450.

Note: The International Journal of Heat and Mass Transfer belongs to the Q1 zone of engineering and technology journals, with an impact factor of 5.0. The first author of the paper is Chen Shoujun from the Institute for Ocean Engineering. Teacher Li Sunwei is the corresponding author. The research results were supported by the Guangdong Basic and Applied Basic Research Foundation.  The authors acknowledge the support from the Tsinghua Shenzhen International Graduate School - Shenzhen Pengrui Young Faculty Program of Shenzhen Pengrui Foundation.

2025-05-16

Congratulations to Liu Longxiang on successfully passing the master's thesis defense at Tsinghua University!

The title of Liu Longxiang's paper is "Research and Application of Tunnel Multi-Source Heterogeneous O&M Data Fusion Based on Ontology". This research takes multi-source heterogeneous operation and maintenance data of tunnels as the research object, introduces ontology semantic web technology, and integrates and utilizes various tunnel operation and maintenance data resources. Firstly, this study constructed a classification system for tunnel operation and maintenance data. For different types of tunnel operation and maintenance data, domain ontology models were established respectively in different ways to achieve the unification of data formats. Subsequently, this study proposed an ontology mapping strategy based on comprehensive similarity to achieve efficient and accurate mapping among ontology models of different operation and maintenance data. Finally, a healthy operation and maintenance strategy for tunnel structures is proposed, including steps such as application ontology construction, mapping and semantic query, structural health assessment, and maintenance strategy selection. In addition, this study also developed a multi-source heterogeneous operation and maintenance data management platform for tunnels and applied it in the actual engineering project of Tanglangshan Tunnel in Shenzhen City, achieving good results.

2025-05-12

On May 12th, the 50th International Exhibition of Inventions  of Geneva  announced the list of winners. The invention "ChatTwin: A Digital Twin Platform for Virtual and Real Verification and Dynamic Monitoring of Construction Processes Empowered by Large Models" by the teaching team from the Department of Civil Engineering of Tsinghua University won the gold award.

The project team has invented a large language model-driven engineering digital twin construction platform and technology - ChatTwin. ChatTwin involves a series of key technologies such as "understanding - reasoning - generation - interaction", and is simple, easy to use, intelligent and efficient. By constructing large language models in vertical fields, precise understanding of professional texts/languages in the construction field, efficient reasoning and calculation of complex engineering logic, as well as efficient analysis and processing of massive engineering data have been achieved. Thus, the learning and usage costs of complex engineering systems can be significantly reduced, and the BIM design review time can be effectively shortened, as well as the risk of problem omission. This system also integrates engineering data from multiple different software or systems, enabling dynamic identification and tracking of potential quality and safety risks during the construction phase.

The ChatTwin completion team also includes teachers Lin Jiarui, Lu Xinzheng, Pan Peng, and Zhang Jianping from Tsinghua University, students Zheng Zhe, Zhou Yucheng, Song Shengyu, Chen Keyin, Ni Xiangrui, Han Jin, and Liao Wenjie, as well as Wu Dapeng, the general manager of Beijing Yunjianxin Technology Co., LTD.

Note: The International Exhibition of Inventions  of Geneva is one of the longest-running and largest invention exhibitions in the world. Jointly organized by the Swiss Federal Government, the government of the Canton of Geneva, the City of Geneva and the World Intellectual Property Organization, it is renowned for its strict selection and professional standards and is ranked first among the "World's Three Major Invention Exhibitions".