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Faster-than-real-time and high-resolution simulation of fluid flow in engineering applications: indoor climate as a pilot

About the project
This research project aims to realize faster-than-real-time (simulation time less than physical flow time) and high-resolution fluid flow simulation in engineering applications, with indoor climate as a pilot. The expected outcome of this project is a static CNN for super-resolution to achieve fast prediction of steady-state indoor airflow, a hybrid RCNN for super-resolution to achieve faster-than-real-time prediction of transient indoor airflow and standards for low-resolution input data by numerical simulation and experimental data. Besides the indoor flow simulations, this project would open a broad spectrum of engineering accurate computational fluid dynamics (CFD) applications complementary to today’s standard application of RANS turbulence models.

Background
Fast and high-resolution heat and mass transfer prediction are critical in many engineering applications. For example, in creating a desired indoor climate, fast and high-resolution airflow and contaminant transport simulation would help sustain life, reduce cost, and minimize energy consumption. In specific scenarios such as emergency management, conceptual design, heating, ventilation, air conditioning and refrigeration (HVAC&R) system control, faster-than-real-time simulation is desired.

Borrowed from computer vision and image recognition, super-resolution is a promising novel approach for the fast analysis of fluid mechanics problems. Super-resolution refers to techniques that obtain a high-resolution flow image output from a low-resolution flow image input. However, super-resolution implementation in real engineering applications faces two major challenges. Firstly, the input low-resolution flow data could be either obtained by fast and computationally inexpensive simulation, e.g., coarse grid CFD simulation, which might be associated with wrong physics or by experimental measurements, where the least number of sensors needed should be identified. Secondly, for transient indoor/outdoor airflow, super-resolution fails in extrapolating the flow fields which belong to a different statistical distribution. Therefore, this study aims to solve the two challenges that state-of-the-art super-resolution models face.

Crossdisciplinary collaboration
The researchers in the team represent the KTH of Architecture and the Built Environment, Department of Civil and Architectural Engineering and KTH School of Engineering Sciences, Department of Engineering Mechanics.

Contacts

Picture of Wei Liu

Wei Liu

Assistant Professor at KTH, PI of project AI-based prediction of urban climate and its impact on built environments at C3.ai DTI, Co-PI of project Faster-than-real-time and high-resolution simulation of fluid flow in engineering applications: indoor climate as a pilot, Digital Futures Faculty

+46 8 790 86 71
weiliu2@kth.se
Picture of Ricardo Vinuesa

Ricardo Vinuesa

Associate Professor at KTH, PI of project An AI-based framework for harmonizing climate policies and projects with the SDGs, Co-PI of project Faster-than-real-time and high-resolution simulation of fluid flow in engineering applications: indoor climate as a pilot, Digital Futures Faculty

+46 8 790 71 52
rvinuesa@mech.kth.se