Two-phase flow modeling: Evaluations and simulations for safer spillway discharge

A flood discharge structure concerns the safety of the dam. lf the flow velocity exceeds 20 m/s, there is a risk of cavitation. In Sweden, many dams belong to this category. To protect the structures, the flow is usually aerated artificially, e.g. through an aerator.

The aerator forms an air cavity, from which air entrained inta the flow.  With the transport of air in the water, air detrainment occurs downstream of the air cavity. It is the air concentration close to the bottom that protects the chute bottom from cavitation.

The project is based on previous and ongoing research performed at KTH within hydralic design. It refers to a natural continuation of evaluating numerical modelling methods closely related to air-water flows in spillway structures. 

Om projektet


James Yang, KTH


Shicheng Li, KTH


Anders Ansell, KTH
Richard Malm, KTH
Erik Nordström, KTH/Vattenfall
Penghua Teng KTH


Li, Shicheng & Li, Qiulin & Yang, James. (2019). CFD Modelling of a Stepped Spillway with Various Step Layouts. Mathematical Problems in Engineering. 2019. 1–11. 10.1155/2019/6215739.

Shicheng Li, James Yang, Wei Liu; Estimation of aerator air demand by an embedded multi-gene genetic programming. Journal of Hydroinformatics 1 September 2021; 23 (5): 1000–1013

J. Yang, P. Teng, F. Laugier, and C. Lin, ‘Flood discharge of piano key weir, air-water flow features’, presented at the 27th ICOLD Congress, Marseille, 2022, 2022.

S. Li, J. Yang, and G. Enmark, ‘Air entrainment and transport in a bottom outlet controlled by a cylindrical gate’, presented at the 14th International Conference on Hydroinformatics, Bucharest, Romania, on 4-8 July 2022, 2022.


maj 2019 - december 2020