开放合作系列

Study of laboratory bubble columns by direct numerical simulation and multiphase VOF method
Abstract
A rapidly increasing number of studies have been made on the modeling of bubble columns using computational fluid dynamics (CFD). In this work, we present a hybrid EulerianEulerian (EE) volume of fluid (EEVOF) method to simulate laboratory rectangle bubble columns with different superficial velocities. This method treats each phase under the EE framework. Meanwhile, an interface compression term is added in the phase fraction equation to capture the largescale interface. Quasi direct numerical simulation (quasiDNS) with interface tracking and the classical EE method are also employed as benchmark models. Our results show that the macroscopic features in the investigated laboratory bubble columns, such as the averaged phase fraction at different cross sections, the liquid velocities and the bubble plume period, predicted by the EEVOF, EE method and quasiDNS agree well with experimental data. Both the EEVOF and the quasiDNS can predict the bubble swarm with largescale interface. However, the quasiDNS is highly computational resources demanding compared with the EEVOF method, which limits its application to industrial simulations.
Results
Left: Prediction of the horizental liquid velocity by the quasiDNS (not finished yet!). Right: Prediction by the EE method in the literature.Main References
 Díaz, M. E., Iranzo, A., Cuadra, D., Barbero, R., Montes, F. J., Galán, M. A. (2008). Numerical simulation of the gas–liquid flow in a laboratory scale bubble column: influence of bubble size distribution and nondrag forces. Chemical Engineering Journal, 139, 363379.
 Li, D., Christian, H. (2017). Simulation of bubbly flows with special numerical treatments of the semiconservative and fully conservative twofluid model. Chemical Engineering Science, 174, 2539.
Job:
 Data processing
 Test cases debugging and running
 Writing paper in English if you are willing to
Requirements:
 Knowledge of OpenFOAM.
 Background in bubble column or gasliquid dispersion, otherwise you have no idea what to write in the Introduction part!
 Knowledge of VOF method, EE method.
 Manuscript should be written in Latex. Our aim is top journals in chemical engineering.
Benefits:
 You can get around 30000 yuan bonus from your host (if you write the manuscript).
 You can use this paper to get promoted faster (if you write the manuscript).
 Another 10000 yuan from my side
 If I write the paper, I can support you 40000 yuan as well. However, I dont have much time to write. So I prefer you writing the paper and to be the first author.
Project duration
Since I have the raw results already. Manuscript should be completed in two months after you undertake this project. One month extension is tolerated, if necessary.

Simulation of the microbubble drag reduction by the Eulerian quadraturebased moments method
Abstract
The presence of near wall bubbles may reduce the skin friction drag. It can be simulated by the twofluid model (TFM) coupled with the population balance model (PBM). One disadvantage of the TFMPBM coupling is that the bubbles with different sizes are transported with identical velocities. In this work, the phenomenon of drag reduction by the injection of microbubbles into turbulent boundary layer was investigated by the fourway coupled Eulerian quadraturebased moments method (EQBMM). In the EQBMM, bubbles movement is controlled by the generalized population balance equation (GPBE). The GPBE is transformed to the moment transport equations and solved by the higherorder realizable finite volume scheme. Simulation results predicted by the EQBMM are compared against experimental data in the literature. Our results show that the EQBMM
Results
Main References
 Mohanarangam, K., Cheung, S. C. P., Tu, J. Y., Chen, L. (2009). Numerical simulation of microbubble drag reduction using population balance model. Ocean Engineering, 36, 863872.
Job:
 Data processing
 Test cases debugging and running
 Writing paper in English if you are willing to
Requirements:
 Knowledge of OpenFOAM.
 Background in bubble drag reduction, otherwise you have no idea what to write in the Introduction part!
 Knowledge of EE method, population balance model.
 Manuscript should be written in Latex. Our aim is top journals in ocean engineering.
Benefits:
 You can get around 30000 yuan bonus from your host (if you write the manuscript).
 You can use this paper to get promoted faster (if you write the manuscript).
 Another 10000 yuan from my side
 If I write the paper, I can support you 40000 yuan as well. However, I dont have much time to write. So I prefer you writing the paper and to be the first author.
Project duration
Since I have the raw results already. Manuscript should be completed in three months after you undertake this project. One month extension is tolerated, if necessary.

Simulations of gasliquid dispersions by fourway coupled EQBMM with aggregation and breakage processes
Abstract
Results
Main References
Job:
 Data processing
 Test cases debugging and running
 Writing paper in English if you are willing to
Requirements:
Benefits:
 You can get around 30000 yuan bonus from your host (if you write the manuscript).
 You can use this paper to get promoted faster (if you write the manuscript).
 Another 10000 yuan from my side
 If I write the paper, I can support you 40000 yuan as well. However, I dont have much time to write. So I prefer you writing the paper and to be the first author.
Project duration